| [GMCnet] TH425 won't shift out of 1st gear [message #219766] |
Sat, 24 August 2013 14:26  |
Eden Weiss
Messages: 21
Registered: June 2011
Karma: 0
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Hi All,
76' PB. When parked this pass may was fine. Took on a shake down round the
block cruise no it won't grab second. Checked fluid only about half qt
low. I added it and a touch of Lucas tranny additive.
Took for cruise and still no second?
Reverse is fine.
Thinking Vac?
All the best-
Eden in CT.
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| Re: [GMCnet] TH425 won't shift out of 1st gear [message #219768 is a reply to message #219766] |
Sat, 24 August 2013 14:48  |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Can you manually shift it there?
Maybe vacuum line off modulator?
Todd Sullivan
Sully
77 royale
Seattle
On Aug 24, 2013, at 12:26 PM, Eden Weiss <edengweiss@gmail.com> wrote:
> Hi All,
>
> 76' PB. When parked this pass may was fine. Took on a shake down round the
> block cruise no it won't grab second. Checked fluid only about half qt
> low. I added it and a touch of Lucas tranny additive.
> Took for cruise and still no second?
> Reverse is fine.
> Thinking Vac?
>
> All the best-
> Eden in CT.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] TH425 won't shift out of 1st gear [message #219770 is a reply to message #219766] |
Sat, 24 August 2013 14:53 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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I'd bet the vacuum line off the modulator either got knocked off or rotted out. That's the symptom of a vacuum modulator not working. The line goes up and connects to the vacuum tree off the mainfold in front of the carb...just to the left and behind the thermostat gooseneck. Short rubber line to a hard line with another short rubber line at the modulator on the passenger side of the tranny.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] TH425 won't shift out of 1st gear [message #219778 is a reply to message #219773] |
Sat, 24 August 2013 16:01 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
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Check for vacuum leaks... perhaps a squirrel got hungry recently, but
I'll put my money on a broken governor gear.
An easy fix.
Mike in NS
On Sat, Aug 24, 2013 at 5:19 PM, michael mitchell <mickeysss@me.com> wrote:
> Vacuum tube off bottom of transmission
>
> Sent from my iPhone
>
> On Aug 24, 2013, at 12:26 PM, Eden Weiss <edengweiss@gmail.com> wrote:
>
> > Hi All,
> >
> > 76' PB. When parked this pass may was fine. Took on a shake down round
> the
> > block cruise no it won't grab second. Checked fluid only about half qt
> > low. I added it and a touch of Lucas tranny additive.
> > Took for cruise and still no second?
> > Reverse is fine.
> > Thinking Vac?
> >
> > All the best-
> > Eden in CT.
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
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| Re: [GMCnet] TH425 won't shift out of 1st gear [message #219789 is a reply to message #219784] |
Sat, 24 August 2013 17:40 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Mickey
I posted (which you quoted below) that it couldn't be the governor gear if the speedometer.
He said he had taken it for a cruise. I assume that he would have noticed if the speedometer didn't work.
If the speedometer is working then -- I repeat, it cannot be the governor gear and there would be not need to put it.
Emery Stora
On Aug 24, 2013, at 4:26 PM, Mickey Space Ship Shuttle wrote:
>
> I think i have heard here you can pull the header to get to it without pulling the trans.
>
> mickey anaheim ca. 77 palm beach
>
>
> On Aug 24, 2013, at 3:19 PM, Emery Stora wrote:
>
>> If the speedometer is working than it cannot be a governor gear.
>>
>> Emery Stora
>>
>> On Aug 24, 2013, at 2:13 PM, Lance <lance@vonprum.com> wrote:
>>
>>>
>>>
>>> This is also a symptom of a bad governor gear. It can be changed without pulling the trans. If it's not the hose I'll bet it's the governor gear.
>>> --
>>> 1976 Palm Beach
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| Re: [GMCnet] TH425 won't shift out of 1st gear [message #219843 is a reply to message #219825] |
Sun, 25 August 2013 07:17 |
mschultz
Messages: 113
Registered: September 2010
Location: Maple City, MI
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A couple of years ago, upon entering Canada at the Saute, we encountered the same problem. With advice from Jim K over the phone, he talked me through the basics, but to no prevail. So with some serious revving, we continued on and fought it for the rest of the trip, not to mention vapor lock due to the ethanol. After returning home, I replaced the modulator, which corrected the gear change problem, but the shifting was erratic. The speedometer was working the whole time. So upon looking at the governor again, it was apparent that the shaft and parts of it were gummed up and not running freely. After dissemble and cleaning everything worked great. Luckily it was before I had headers.It may have occurred just after changing the transmission fluid and filter. Just my experience. What everyone else said is correct, mine just happened to be a combination of issues. As always, nothing like having the Jim's, the Forum and the Black list to back you up. We are getting ready to head out on a 10,000 mile adventure, so to all of you, thanks for being there.
Though none of these adventures are fun, the amazing thing about the GMC and other 'old technology' is in the end it will get you through. My lovely bride just agreed and said something about the reliability of the Model T. She still has doubts.
About headers, I had not heard this before, but my neighbor and genius mechanic, pointed out to me that one should shield the governor from the heat of the new headers. I used a disposable aluminum turkey pan, cut, bent and shaped to not contact either the governor or the header, secured with tie wraps. Also added shielded to oil filter lines coming off the filter to the oil cooler. No cost protection, if you are interested.
M Schultz
77 403 Palm Beach
'The Pickle'
Michigan
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| Re: [GMCnet] TH425 won't shift out of 1st gear [message #219924 is a reply to message #219854] |
Sun, 25 August 2013 21:32 |
gene1
Messages: 50
Registered: February 2004
Location: Southern California
Karma: 0
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GMCers,
This may not work for anyone but me, but this is what happened on a trip
back from Newport.
The transmission would not shift up from first gear. I checked the fluid
level on the transmission, it looked more than full, but I added a quart
anyway. Still no help. Decided that I would drive home in first gear -
35mph. As I was driving I pulled the shift lever to S. It shifted to S,
then I put the lever in D, it shifted up to Drive all by itself. I had to
stop at several more lights, but used the same procedure to get into drive.
Talked to Manny, He said it was not a governor gear problem, but sludge
around the small shaft in the governor. He said to take the governor out
and clean the bore around the shaft. I did that and put it back together,
also drained 2 quarts of excess transmission fluid, but saved it just in
case. Haven't done a test drive yet, since I just got shingles - wish me
luck. Never had shingles? No fun, and I even got the shot in 2007.
Regards
Gene 76 Eleganza North County San Diego
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dan Gregg
Sent: Sunday, August 25, 2013 6:25 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] TH425 won't shift out of 1st gear
I have never found pulling the left header to be a problem. I guess I have
had it off enough I just don't think about it. 4 bolts, none in center of
mine. I have the fat Remflex gaskets now so I have not had to pull it in a
while. With other gaskets the driver side header was off on a regular basis
to replace one. I could never get any gasket to seal for some reason. Maybe
that header is warped or something but the fat gaskets did it for me.
Hope you have located the problem and have it fixed. Should not be a big
deal either way, governor or modulator.
Dan
--
Dan & Teri Gregg
Dexter, Mo.
http://danandteri.blogspot.com/
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| Re: [GMCnet] TH425 won't shift out of 1st gear [message #219925 is a reply to message #219924] |
Sun, 25 August 2013 21:39 |
 |
WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Senior Member |
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Oh dang. I hear that can be very painful. Let us know how you get along. Also let us know when you test drive the coach. I hope that cures the shifting problem. It is good information to know.
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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