Home » Public Forums » GMCnet » As The Manny Tranny Shifts
| As The Manny Tranny Shifts [message #84592] |
Fri, 14 May 2010 17:19  |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Senior Member |
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Just let me say, I am glad that Doctor Wally enjoys my company. We were two greasy animals after yesterday's work on the transmission. Thanks to everyone who called or sent emails trying to help me figure this thing out.
First, I drained fluid, it was good. Took the cooling lines off and blew them out. Put fluid back in and the lines on. Checked the two flexible tubes, top and bottom, on the vacuum line with a vacuum gun. They were good. Blew out the metal vacuum tube. We bypassed the tube and ran a rubber vacuum line in its place. None of that solved any problems. We teed the vacuum line, at bottom, and put a vacuum gauge on it to see what the vacuum was there. Pulled out modulator to make sure we had proper level of fluid, we did. We put vacuum on the modulator to make sure it would move, it did. Adjusted the shift linkage 3 times and finally got it correct. Ran down the road with the vacuum and a pressure gauge to watch. Then we checked the pressure sitting still, after warm up. Everything good. Still had the problem.
Last, we took governor out and compared it to one Wally brought. All we could tell were the springs were different colors. One was green and one was yellow. Then we stuck the governor in that Wally brought. Took it on a 25 mile run and it was fixed. Not believing that, today we took Teri on a 125 mile geocache trip and the dang thing worked perfect.
What can I say? We did actually have Manny on speed dial.
The problem was that the thing would kick down into second gear while we were just cruising at the speed limit with normal vacuum at 15 inches or above. It kept getting more frequent as time went on. I could not get it back into 3rd no matter what I did. It "freewheeled" in second like it was in neutral when I let off the pedal. If I pulled it down to second I had engine braking.
Folks have called and emailed to see if we got it fixed. I did not want to post until our run today was a success.
Life is once again good in the Gregg driveway.
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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| Re: As The Manny Tranny Shifts [message #84595 is a reply to message #84592] |
Fri, 14 May 2010 17:31  |
Rick Williams
Messages: 256
Registered: July 2004
Karma: 0
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Senior Member |
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Dan
I am glad you got it fixed wthout pulling the tranny or even the pan. It sounds as if you got greasy enough as it was. It is interesting that it was another governor. The symptoms were very similar to mine. We talked about this at Bean Station and of course here on the net and I come away with two points.
1. Governors almost never fail
2. I have talked to and read about quite a few people who have had governor failures.
Today was a good day. See you down the road.
Rick
Rick Williams
Bliss, Michigan
1978 Eleganza II
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| Re: As The Manny Tranny Shifts [message #84599 is a reply to message #84592] |
Fri, 14 May 2010 17:49 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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| WD0AFQ wrote on Fri, 14 May 2010 18:19 |
Just let me say, I am glad that Doctor Wally enjoys my company. We were two greasy animals after yesterday's work on the transmission. Thanks to everyone who called or sent emails trying to help me figure this thing out.
First, I drained fluid, it was good. Took the cooling lines off and blew them out. Put fluid back in and the lines on. Checked the two flexible tubes, top and bottom, on the vacuum line with a vacuum gun. They were good. Blew out the metal vacuum tube. We bypassed the tube and ran a rubber vacuum line in its place. None of that solved any problems. We teed the vacuum line, at bottom, and put a vacuum gauge on it to see what the vacuum was there. Pulled out modulator to make sure we had proper level of fluid, we did. We put vacuum on the modulator to make sure it would move, it did. Adjusted the shift linkage 3 times and finally got it correct. Ran down the road with the vacuum and a pressure gauge to watch. Then we checked the pressure sitting still, after warm up. Everything good. Still had the problem.
Last, we took governor out and compared it to one Wally brought. All we could tell were the springs were different colors. One was green and one was yellow. Then we stuck the governor in that Wally brought. Took it on a 25 mile run and it was fixed. Not believing that, today we took Teri on a 125 mile geocache trip and the dang thing worked perfect.
What can I say? We did actually have Manny on speed dial.
The problem was that the thing would kick down into second gear while we were just cruising at the speed limit with normal vacuum at 15 inches or above. It kept getting more frequent as time went on. I could not get it back into 3rd no matter what I did. It "freewheeled" in second like it was in neutral when I let off the pedal. If I pulled it down to second I had engine braking.
Folks have called and emailed to see if we got it fixed. I did not want to post until our run today was a success.
Life is once again good in the Gregg driveway.
Dan
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Atta Boy !!! I am proud of you.. I learned a lot from your experience.
C. Boyd
76 Crestmont
East Tennessee
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| Re: As The Manny Tranny Shifts [message #84612 is a reply to message #84592] |
Fri, 14 May 2010 19:29 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Dan,
Congratulations!
Truly outstanding of Wally to make the trip and help you resolve the issue.
Safe travels.
Dennis
| WD0AFQ wrote on Fri, 14 May 2010 17:19 |
Just let me say, I am glad that Doctor Wally enjoys my company. We were two greasy animals after yesterday's work on the transmission. Thanks to everyone who called or sent emails trying to help me figure this thing out.
First, I drained fluid, it was good. Took the cooling lines off and blew them out. Put fluid back in and the lines on. Checked the two flexible tubes, top and bottom, on the vacuum line with a vacuum gun. They were good. Blew out the metal vacuum tube. We bypassed the tube and ran a rubber vacuum line in its place. None of that solved any problems. We teed the vacuum line, at bottom, and put a vacuum gauge on it to see what the vacuum was there. Pulled out modulator to make sure we had proper level of fluid, we did. We put vacuum on the modulator to make sure it would move, it did. Adjusted the shift linkage 3 times and finally got it correct. Ran down the road with the vacuum and a pressure gauge to watch. Then we checked the pressure sitting still, after warm up. Everything good. Still had the problem.
Last, we took governor out and compared it to one Wally brought. All we could tell were the springs were different colors. One was green and one was yellow. Then we stuck the governor in that Wally brought. Took it on a 25 mile run and it was fixed. Not believing that, today we took Teri on a 125 mile geocache trip and the dang thing worked perfect.
What can I say? We did actually have Manny on speed dial.
The problem was that the thing would kick down into second gear while we were just cruising at the speed limit with normal vacuum at 15 inches or above. It kept getting more frequent as time went on. I could not get it back into 3rd no matter what I did. It "freewheeled" in second like it was in neutral when I let off the pedal. If I pulled it down to second I had engine braking.
Folks have called and emailed to see if we got it fixed. I did not want to post until our run today was a success.
Life is once again good in the Gregg driveway.
Dan
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] As The Manny Tranny Shifts [message #84615 is a reply to message #84592] |
Fri, 14 May 2010 19:49 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Dan,
Great news!
So it was the governor.
Can anyone explain the govern spring colors?
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dan Gregg
Sent: Saturday, 15 May 2010 8:19 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] As The Manny Tranny Shifts
Just let me say, I am glad that Doctor Wally enjoys my company. We were two
greasy animals after yesterday's work on the transmission. Thanks to
everyone who called or sent emails trying to help me figure this thing out.
First, I drained fluid, it was good. Took the cooling lines off and blew
them out. Put fluid back in and the lines on. Checked the two flexible
tubes, top and bottom, on the vacuum line with a vacuum gun. They were good.
Blew out the metal vacuum tube. We bypassed the tube and ran a rubber vacuum
line in its place. None of that solved any problems. We teed the vacuum
line, at bottom, and put a vacuum gauge on it to see what the vacuum was
there. Pulled out modulator to make sure we had proper level of fluid, we
did. We put vacuum on the modulator to make sure it would move, it did.
Adjusted the shift linkage 3 times and finally got it correct. Ran down the
road with the vacuum and a pressure gauge to watch. Then we checked the
pressure sitting still, after warm up. Everything good. Still had the
problem.
Last, we took governor out and compared it to one Wally brought. All we
could tell were the springs were different colors. One was green and one was
yellow. Then we stuck the governor in that Wally brought. Took it on a 25
mile run and it was fixed. Not believing that, today we took Teri on a 125
mile geocache trip and the dang thing worked perfect.
What can I say? We did actually have Manny on speed dial.
The problem was that the thing would kick down into second gear while we
were just cruising at the speed limit with normal vacuum at 15 inches or
above. It kept getting more frequent as time went on. I could not get it
back into 3rd no matter what I did. It "freewheeled" in second like it was
in neutral when I let off the pedal. If I pulled it down to second I had
engine braking.
Folks have called and emailed to see if we got it fixed. I did not want to
post until our run today was a success.
Life is once again good in the Gregg driveway.
Dan
--
Dan & Teri Gregg
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: As The Manny Tranny Shifts [message #84619 is a reply to message #84592] |
Fri, 14 May 2010 20:08 |
Luvn737s
Messages: 1106
Registered: June 2007
Karma: 2
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Senior Member |
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I've decided to install a NOS GMC Eight Ball as a permanent fix to my tranny problems:
"Will it go into drive?"
"All signs point to No! Now tell them to quit honking and just go around you"
Randy
1973 26' Painted Desert
Ahwatukee (Phoenix) AZ
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| Re: [GMCnet] As The Manny Tranny Shifts [message #84641 is a reply to message #84638] |
Fri, 14 May 2010 23:58 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Dan,
Thanks for the clarification on the governor springs; I thought you had two
DIFFERENT colored springs in the "old" governor; one green and one yellow
and that DID NOT make sense to me as logically they should be the same.
When Manny comes down from the mountain, we need him to give us a sermon on
governor spring colors! ;-)
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dan Gregg
Sent: Saturday, 15 May 2010 2:42 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] As The Manny Tranny Shifts
Rob, Wally and I are also wondering about the spring colors. Mine were green
and the ones in the "new" gov were yellow. After we finished and test drove
the thing we could not even feel it shifting. Just like my old transmission.
This new one always shifted hard from 2nd to high, with that governor. I put
a few pictures on my blog tonight.
We called Manny as soon as we got back. He was happy. Also, he was happy
because he had just climbed a big mountain pass with his 4 banger diesel.
Sounded like a kid on Christmas morning. I could not even hear the diesel
running. Must not be too loud inside the coach.
Thanks again to everyone that contacted me about the problem.
Dan
--
Dan & Teri Gregg
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] As The Manny Tranny Shifts [message #84720 is a reply to message #84668] |
Sat, 15 May 2010 14:34 |
Surbo
Messages: 213
Registered: February 2004
Karma: 0
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Senior Member |
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| Surbo wrote on Sat, 15 May 2010 08:49 |
| Robert Mueller wrote on Fri, 14 May 2010 23:58 |
Dan,
Thanks for the clarification on the governor springs; I thought you had two
DIFFERENT colored springs in the "old" governor; one green and one yellow
and that DID NOT make sense to me as logically they should be the same.
When Manny comes down from the mountain, we need him to give us a sermon on
governor spring colors! 
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
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Rob;
The gov I looked at this week had one purple color spring and one tan color. There are TWO sets of weights in the gov, one heavy set, for slow speed and one light set, for higher speeds.
Bob Drewes in SESD
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Rob and everyone in governor land;
I looked at three more governors this morning, one had grey spring and orange spring combo, the second had a grey and a green with yellow stripe, and the other had both green springs.
Bob Drewes in SESD (where the governors roam...)
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| Re: [GMCnet] As The Manny Tranny Shifts [message #84847 is a reply to message #84720] |
Sun, 16 May 2010 14:56 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Bob, Dan, Rob et al
While you all have access to the governor springs -- is it possible to record the color and the number of turns on the spring and the diameter of the spring wire? Are the springs easily removed? If so, perhaps also record the uncompressed height. This would help build a data base which might help us in the future if we do not find/determine the color code specifications.
Dennis
| Surbo wrote on Sat, 15 May 2010 14:34 |
| Surbo wrote on Sat, 15 May 2010 08:49 |
| Robert Mueller wrote on Fri, 14 May 2010 23:58 |
Dan,
Thanks for the clarification on the governor springs; I thought you had two
DIFFERENT colored springs in the "old" governor; one green and one yellow
and that DID NOT make sense to me as logically they should be the same.
When Manny comes down from the mountain, we need him to give us a sermon on
governor spring colors!
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
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Rob;
The gov I looked at this week had one purple color spring and one tan color. There are TWO sets of weights in the gov, one heavy set, for slow speed and one light set, for higher speeds.
Bob Drewes in SESD
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Rob and everyone in governor land;
I looked at three more governors this morning, one had grey spring and orange spring combo, the second had a grey and a green with yellow stripe, and the other had both green springs.
Bob Drewes in SESD (where the governors roam...)
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] As The Manny Tranny Shifts [message #84852 is a reply to message #84850] |
Sun, 16 May 2010 16:00 |
Surbo
Messages: 213
Registered: February 2004
Karma: 0
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Senior Member |
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| WD0AFQ wrote on Sun, 16 May 2010 15:12 |
Dennis, from what Bob is finding I wonder if spring color has anything to do with anything. You would think it would. Wally is going to get into this governor and see what he can figure out. He will take pictures and document everything. Manny is also interested in what caused this governor to act the way it did. I am just glad that Wally had the spare and the forethought to bring it with him. He plans to do some measuring of the springs and test their strength. My thinking is we need to grab everyone we find in the junkyards from now on.
I think I mentioned that when we took off with the "new" governor installed we could not feel the transmission shifting. With the old one it shifted very hard into high, before I started having problems.
Dan
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Dan;
I wish Dr Wally would have just pulled the original gov, cleaned it up good, and replaced it to see if there was some minor dirt problem causing the gov not to do it's job correctly. Just curious, I know it would be another header removal.
I wonder the same as you do on the color, could be just the year of production, etc. The reason I say this is because the build sheet for the Cad, Olds and MH only list three spring numbers, 8626842, 8626843, and 8626750. There are more colors than that. I agree for the need to do a compression test and see how many gram tension each spring has.
There are two sets of weights in each gov, the heavy weights effect the low speed mph shift, and the combo of the light pair of weights and the springs control the 2-3 shift mostly. There has been work done on the weights, don't know how the results were, but knowing Bill Bramlett, he would do it until it's right. BUT, there are many variables, modulator pressure, line pressure, leakage in the gov system, etc for each tranny, and this all had to be entered into consideration when doing changes.
The steel gov shaft is turned by the nylon gear, and the gov shaft spins in the aluminum tranny case. If there is undue wear on the tranny housing, or scoring, of both the tranny housing and the gov shaft, there is not going to be the correct tolerances to make a hydraulic seal, and that is critical for the gov to do it's job, pressure wise.
This clearance needs to be checked when the tranny housing is stripped, and if needed, a steel insert bushing is installed in the tranny housing and then honed to make a correct fit for the gov shaft.
Bob Drewes in SESD
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| Re: [GMCnet] As The Manny Tranny Shifts [message #84853 is a reply to message #84850] |
Sun, 16 May 2010 16:07 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Dan,
Great. Will be most interesting to see what he may determine.
Thank you.
Dennis
Dennis Sexton
73 GMC
Germantown, TN
USA
-----Original Message-----
From: Dan Gregg <gregg_dan@hotmail.com>
To: gmclist@temp.gmcnet.org
Sent: Sun, May 16, 2010 3:12 pm
Subject: Re: [GMCnet] As The Manny Tranny Shifts
Dennis, from what Bob is finding I wonder if spring color has anything to do
ith anything. You would think it would. Wally is going to get into this
overnor and see what he can figure out. He will take pictures and document
verything. Manny is also interested in what caused this governor to act the way
t did. I am just glad that Wally had the spare and the forethought to bring it
ith him. He plans to do some measuring of the springs and test their strength.
y thinking is we need to grab everyone we find in the junkyards from now on.
think I mentioned that when we took off with the "new" governor installed we
ould not feel the transmission shifting. With the old one it shifted very hard
nto high, before I started having problems.
an
-
an & Teri Gregg
http://danandteri.blogspot.com/
______________________________________________
MCnet mailing list
ist Information and Subscription Options:
ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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List Information and Subscription Options:
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] As The Manny Tranny Shifts [message #84854 is a reply to message #84852] |
Sun, 16 May 2010 16:12 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Bob,
Excellent information. Yes, quite a number of variables -- sounds more and more like a quadrajet carb discussion.
Thanks for sharing.
Dennis Sexton
73 GMC
Germantown, TN
USA
-----Original Message-----
From: Bob Drewes <bmdrewes@iw.net>
To: gmclist@temp.gmcnet.org
Sent: Sun, May 16, 2010 4:00 pm
Subject: Re: [GMCnet] As The Manny Tranny Shifts
WD0AFQ wrote on Sun, 16 May 2010 15:12
Dennis, from what Bob is finding I wonder if spring color has anything to do
ith anything. You would think it would. Wally is going to get into this
overnor and see what he can figure out. He will take pictures and document
verything. Manny is also interested in what caused this governor to act the way
t did. I am just glad that Wally had the spare and the forethought to bring it
ith him. He plans to do some measuring of the springs and test their strength.
y thinking is we need to grab everyone we find in the junkyards from now on.
I think I mentioned that when we took off with the "new" governor installed we
ould not feel the transmission shifting. With the old one it shifted very hard
nto high, before I started having problems.
Dan
an;
I wish Dr Wally would have just pulled the original gov, cleaned it up good, and
eplaced it to see if there was some minor dirt problem causing the gov not to
o it's job correctly. Just curious, I know it would be another header removal.
I wonder the same as you do on the color, could be just the year of production,
tc. The reason I say this is because the build sheet for the Cad, Olds and MH
nly list three spring numbers, 8626842, 8626843, and 8626750. There are more
olors than that. I agree for the need to do a compression test and see how many
ram tension each spring has.
There are two sets of weights in each gov, the heavy weights effect the low
peed mph shift, and the combo of the light pair of weights and the springs
ontrol the 2-3 shift mostly. There has been work done on the weights, don't
now how the results were, but knowing Bill Bramlett, he would do it until it's
ight. BUT, there are many variables, modulator pressure, line pressure,
eakage in the gov system, etc for each tranny, and this all had to be entered
nto consideration when doing changes.
The steel gov shaft is turned by the nylon gear, and the gov shaft spins in the
luminum tranny case. If there is undue wear on the tranny housing, or scoring,
f both the tranny housing and the gov shaft, there is not going to be the
orrect tolerances to make a hydraulic seal, and that is critical for the gov to
o it's job, pressure wise.
This clearance needs to be checked when the tranny housing is stripped, and if
eeded, a steel insert bushing is installed in the tranny housing and then honed
o make a correct fit for the gov shaft.
Bob Drewes in SESD
_______________________________________________
MCnet mailing list
ist Information and Subscription Options:
ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] As The Manny Tranny Shifts [message #84855 is a reply to message #84853] |
Sun, 16 May 2010 16:24 |
gmcrv1
Messages: 839
Registered: August 2007
Location: Memphis
Karma: -1
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Senior Member |
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I know that different color springs in the old drum brake systems determined
length, compression and diameter of the springs. If you went into a parts
store and asked for a spring kit - the kits would vary quite a bit
from vehicle to vehicle. I would think it's the same for the transmission
governor kits.
Tom Eckert
73 Glacier
On Sun, May 16, 2010 at 4:07 PM, <dennisfsexton@aol.com> wrote:
>
> Dan,
>
> Great. Will be most interesting to see what he may determine.
>
> Thank you.
> Dennis
>
>
>
>
> Dennis Sexton
> 73 GMC
> Germantown, TN
> USA
>
>
>
> -----Original Message-----
> From: Dan Gregg <gregg_dan@hotmail.com>
> To: gmclist@temp.gmcnet.org
> Sent: Sun, May 16, 2010 3:12 pm
> Subject: Re: [GMCnet] As The Manny Tranny Shifts
>
>
>
> Dennis, from what Bob is finding I wonder if spring color has anything to
> do
> ith anything. You would think it would. Wally is going to get into this
> overnor and see what he can figure out. He will take pictures and document
> verything. Manny is also interested in what caused this governor to act the
> way
> t did. I am just glad that Wally had the spare and the forethought to bring
> it
> ith him. He plans to do some measuring of the springs and test their
> strength.
> y thinking is we need to grab everyone we find in the junkyards from now
> on.
> think I mentioned that when we took off with the "new" governor installed
> we
> ould not feel the transmission shifting. With the old one it shifted very
> hard
> nto high, before I started having problems.
> an
> -
> an & Teri Gregg
> http://danandteri.blogspot.com/
>
>
> ______________________________________________
> MCnet mailing list
> ist Information and Subscription Options:
> ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] As The Manny Tranny Shifts [message #84859 is a reply to message #84852] |
Sun, 16 May 2010 19:02 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Bob,
I worked as Field Service Rep for a company called Hamilton Standard whose
product lines included propeller controls (PC).
The flyweight governor in the PC positioned a pilot valve that regulated the
pressure applied to the piston in the propeller dome which positioned the
blades to maintain a constant propeller rotating speed no matter what the
engine power level setting was. The more power applied the greater the pitch
the greater the thrust.
The governors were calibrated by using springs with different tensions.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Bob Drewes
Sent: Monday, 17 May 2010 7:00 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] As The Manny Tranny Shifts
Dan;
I wish Dr Wally would have just pulled the original gov, cleaned it up good,
and replaced it to see if there was some minor dirt problem causing the gov
not to do it's job correctly. Just curious, I know it would be another
header removal.
I wonder the same as you do on the color, could be just the year of
production, etc. The reason I say this is because the build sheet for the
Cad, Olds and MH only list three spring numbers, 8626842, 8626843, and
8626750. There are more colors than that. I agree for the need to do a
compression test and see how many gram tension each spring has.
There are two sets of weights in each gov, the heavy weights effect the low
speed mph shift, and the combo of the light pair of weights and the springs
control the 2-3 shift mostly. There has been work done on the weights, don't
know how the results were, but knowing Bill Bramlett, he would do it until
it's right. BUT, there are many variables, modulator pressure, line
pressure, leakage in the gov system, etc for each tranny, and this all had
to be entered into consideration when doing changes.
The steel gov shaft is turned by the nylon gear, and the gov shaft spins in
the aluminum tranny case. If there is undue wear on the tranny housing, or
scoring, of both the tranny housing and the gov shaft, there is not going to
be the correct tolerances to make a hydraulic seal, and that is critical for
the gov to do it's job, pressure wise.
This clearance needs to be checked when the tranny housing is stripped, and
if needed, a steel insert bushing is installed in the tranny housing and
then honed to make a correct fit for the gov shaft.
Bob Drewes in SESD
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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