| Loose Wire in the Tranny [message #96336] |
Wed, 18 August 2010 16:11  |
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JShot
Messages: 485
Registered: October 2006
Location: NW Ohio
Karma: 0
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Ok, so I'm putting in the 3.55 gears from Jim K. Step #1, pull the vacuum modulator and drain some trans fluid. Hey, while we're doing that, why not just change the trans fluid and filter, too.
So I drop the pan and inspect the trans. Hello, what's this wire hanging by one end? It looks like it's supposed to be soldered to a funny looking can, and the can cover is very loose. I'm assuming I should pull the wire and can, and re-solder them together?
And the modulator had one O ring and the trans filter had two - I believe that's right, right?
The fluid was not the very clean clear red as new fluid is, it was a little dark. But it didn't smell burned at all. The coach came with two, new trans pan gaskets in boxes, and the PO said it always seemed to leak a little. He was right, it always has.
So any tips or suggestions on this part of the operation?
As always,
Thanks!
John
John Shotwell
Ridgeville Corners, OH
78 Royale Center Kitchen
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| Re: Loose Wire in the Tranny [message #96356 is a reply to message #96336] |
Wed, 18 August 2010 19:44  |
John Sharpe
Messages: 489
Registered: February 2006
Location: Texas
Karma: 1
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| Quote: |
JSHOT wrote:.....So I drop the pan and inspect the trans. Hello, what's this wire hanging by one end? It looks like it's supposed to be soldered to a funny looking can, and the can cover is very loose. I'm assuming I should pull the wire and can, and re-solder them together?..........
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John, Give it a shot. I sounds like the downshift solenoid power wire. The downshift solenoid comes with the wire and should still be available. IF it clicks with a 12v + wire hooked to it, it is probably good. Check the maintenance manual. There maybe a spring loaded pintle. Maybe, Manny can enlighten us on this one.
Of course the downshift switch has to get power to it for it to activate the 'passing gear' LOL! If you plan on getting the solenoid working, I would do this repair now before replacing the fluid and pan.
John Sharpe
Humble,TX
'78 Eleganza TBI
'89 Spectrum 2000 MPI V-10
'40 Ford Panel Delivery TPI
johnasharpe@gmail.com
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| Re: Loose Wire in the Tranny [message #96358 is a reply to message #96356] |
Wed, 18 August 2010 20:11 |
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JShot
Messages: 485
Registered: October 2006
Location: NW Ohio
Karma: 0
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Senior Member |
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John,
Yeah, it's the wire that comes out the side of the tranny by the vac modulator.
I got a little braver (when haven't I been) and un-bolted the 'can'. The wire really goes inside the can to the coil. The wire, at some point, had broken where it exits the can, and some PO had tried to solder it together at the point of its exit and he didn't cover it. Therefore, this wire has been grounded all this time.
I'm getting oil and filter and other stuff tomorrow for this exercise, so will ask the counter guy if this part is still available and pick one up. If not, I can solder it right and shrink tube it and it should be ok. I put +12v on it and it works, so the coil seems to be good.
Thanks,
John
John Shotwell
Ridgeville Corners, OH
78 Royale Center Kitchen
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| Re: [GMCnet] Loose Wire in the Tranny [message #96360 is a reply to message #96358] |
Wed, 18 August 2010 20:15 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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It is still available but it may look a little different that the original in the GMC but the new looking one will work fine.
It is the same as that used in the GM hydromatic transmissions. If you don't find one locally you can get one from Manny Trovao.
Emery Stora
On Aug 18, 2010, at 7:11 PM, John Shotwell wrote:
>
>
> John,
> Yeah, it's the wire that comes out the side of the tranny by the vac modulator.
>
> I got a little braver (when haven't I been) and un-bolted the 'can'. The wire really goes inside the can to the coil. The wire, at some point, had broken where it exits the can, and some PO had tried to solder it together at the point of its exit and he didn't cover it. Therefore, this wire has been grounded all this time.
>
> I'm getting oil and filter and other stuff tomorrow for this exercise, so will ask the counter guy if this part is still available and pick one up. If not, I can solder it right and shrink tube it and it should be ok. I put +12v on it and it works, so the coil seems to be good.
>
> Thanks,
> John
> --
> John Shotwell
> Archbold, OH
> 78 Royale Center Kitchen
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| Re: Loose Wire in the Tranny [message #96377 is a reply to message #96336] |
Wed, 18 August 2010 22:41 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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To set the kickdown switch under the gas pedal, slide it up past the ratcheting pawl and the first WOT foot to floor self sets the ratching switch to the correct position. Fuse might be gone from the short so check that and it should now work.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Loose Wire in the Tranny [message #96388 is a reply to message #96336] |
Thu, 19 August 2010 06:51 |
Rick Williams
Messages: 256
Registered: July 2004
Karma: 0
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John
When I had problems with my new Mannny transmission, Manny suspected the kickdown solenoid. He said that his only source was from China and he was having problems with them. He was advocating eliminating the relay and downshifting manually. He has a procedure for eliminating the solenoid if you so choose. Given my recent experience with starter solenoids from China, I would not replace the solenoid unless I knew where it was manufactured. My tranny problem turned out to be the governor.
Rick
Rick Williams
Bliss, Michigan
1978 Eleganza II
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| Re: Loose Wire in the Tranny [message #96532 is a reply to message #96388] |
Fri, 20 August 2010 14:01 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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""Given my recent experience with starter solenoids from China, I would not replace the solenoid unless I knew where it was manufactured. My tranny problem turned out to be the governor.
""
Where was the governor made?
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Loose Wire in the Tranny [message #96537 is a reply to message #96534] |
Fri, 20 August 2010 14:21 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""After not finding the kick-down solenoid at three auto places, I soldered the wire back together, covered it with two layers of heat shrink tubing, tested it, and put it back in the tranny. All should be good now.
""
Thanks John. I'm one of those that still like to have a working kick-down. I understand all of the reasons why a manual downshift has merits such as when climbing mountains, but there are times when just a quick downshift while passing or need for just some extra grunt is nice without having to think about it or yank on the shift lever.
My question about the governor was based on some of the comments about poor quality Chinese parts. The OEM's as well as my company source many components from China with excellent results. The key is having good requirements and performance specs. Without those you will get crap no matter where you source from. My guess is that the govenor that failed was not from China. And no, I'm not getting into the wisdom of sourcing abroad 
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Loose Wire in the Tranny [message #96578 is a reply to message #96336] |
Fri, 20 August 2010 18:16 |
Rick Williams
Messages: 256
Registered: July 2004
Karma: 0
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Senior Member |
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Bob
The bad governor was on a "new" Manny transmission. It was bad from the time I had the transmission installed in Arkansas. I had the old tranny in the back of my Jeep and changed the governor in Missouri. The new transmission was not shifting well. The old governor resolved the issue. I am assuming that the one Manny installed on the rebuilt tranny was from a used GMC transmission. But I do not know for sure. Manny says that he can not do a full load test on the transmissions on his test stand and therefore can not always spot a bad governor.
My experience with Chinese parts was with two sticking starter solenoids on my Ford van. The one made in Mexico from the Ford Dealership has not failed. It was twice the price but worth it considering all the grief and time I went through with the Chinese Napa solenoids. I posted about those solenoids on the GMCnet a few weeks ago.
Rick
Rick Williams
Bliss, Michigan
1978 Eleganza II
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