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[GMCnet] Don't always wright off your trans as going bad. Or gone. [message #312525]

Thu, 26 January 2017 13:02

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

This is something that I've seen at times. And it happened to me back in Nov. Coming back from Chicago. I'd be going down an Interstate off ramp. And at about 35 MPH. The trans would disengage the engine. Thus the engine went to idle. Yes. This can be a sign of a full failure. But there are two things that can do this that can be fixed by anyone. Simply. There is a small steel vacuum line that goes from the front of the carb. To the right side of the trans. And has a small sections of rubber hose at each end. If there is a vacuum leak in this line. This is a sign. Next pull that rubber hose off the trans vacuum modulator. There shouldn't be any signs of trans fluid in that hose. That's another sign. Mine had neither sign. I spent $30 for a vacuum modulator. Changed the modulator. Fixed. If you do this. Have the new one ready to quikly stick in. As fluid will rapidly come out. Make sure the old O ring comes out with the old modulator.

Someone I know was on their way to Texas lately in their GMC. They were about 200 miles from home. When they decided to stop for the night. The next morning. The transmission wouldn't work. They put a can of TransX in the transmission. Started the engine. And moved the shifter lever from gear to gear. Stopped doing that. But let the engine continue to run. Then did this same process several more times. After about 45 minutes. The trans started to work again. I told them to fill up with gas. Drive 50 to 55 MPH home. And don't stop. I've done this with cars I've had. May not work every time. But this saved a big towing bill. As what do you have to loss at that point anyway. Remember. This DID NOT fix the trans. But DID get them home. Bob Dunahugh.
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Re: [GMCnet] Don't always wright off your trans as going bad. Or gone. [message #312526 is a reply to message #312525]

Thu, 26 January 2017 13:09

Billy Massey

Messages: 916
Registered: January 2004
Location: Central Texas

Karma: 1

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So was the modulator his problem? Why did the TransX work with a bad
modulator?

On Jan 26, 2017 1:03 PM, "Bob Dunahugh" wrote:

Someone I know was on their way to Texas lately in their GMC. They were
about 200 miles from home. When they decided to stop for the night. The
next morning. The transmission wouldn't work. They put a can of TransX in
the transmission. Started the engine. And moved the shifter lever from gear
to gear. Stopped doing that. But let the engine continue to run. Then did
this same process several more times. After about 45 minutes. The trans
started to work again. I told them to fill up with gas. Drive 50 to 55 MPH
home. And don't stop. I've done this with cars I've had. May not work every
time. But this saved a big towing bill. As what do you have to loss at that
point anyway. Remember. This DID NOT fix the trans. But DID get them home.
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bdub
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Re: [GMCnet] Don't always wright off your trans as going bad. Or gone. [message #312539 is a reply to message #312525]

Thu, 26 January 2017 18:54

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

Billy. The post covered two different issues. I've never seen a bad modulator stop all function. The trans that got them home continues to work. But I wouldn't take it far from home. The interesting part of the full lack of functioning trans. That trans didn't have a lot of miles on it from what I understand. Bob Dunahugh

________________________________
From: Bob Dunahugh
Sent: Thursday, January 26, 2017 1:02 PM
To: gmclist@list.gmcnet.org
Subject: Don't always wright off your trans as going bad. Or gone.

This is something that I've seen at times. And it happened to me back in Nov. Coming back from Chicago. I'd be going down an Interstate off ramp. And at about 35 MPH. The trans would disengage the engine. Thus the engine went to idle. Yes. This can be a sign of a full failure. But there are two things that can do this that can be fixed by anyone. Simply. There is a small steel vacuum line that goes from the front of the carb. To the right side of the trans. And has a small sections of rubber hose at each end. If there is a vacuum leak in this line. This is a sign. Next pull that rubber hose off the trans vacuum modulator. There shouldn't be any signs of trans fluid in that hose. That's another sign. Mine had neither sign. I spent $30 for a vacuum modulator. Changed the modulator. Fixed. If you do this. Have the new one ready to quikly stick in. As fluid will rapidly come out. Make sure the old O ring comes out with the old modulator.

Someone I know was on their way to Texas lately in their GMC. They were about 200 miles from home. When they decided to stop for the night. The next morning. The transmission wouldn't work. They put a can of TransX in the transmission. Started the engine. And moved the shifter lever from gear to gear. Stopped doing that. But let the engine continue to run. Then did this same process several more times. After about 45 minutes. The trans started to work again. I told them to fill up with gas. Drive 50 to 55 MPH home. And don't stop. I've done this with cars I've had. May not work every time. But this saved a big towing bill. As what do you have to loss at that point anyway. Remember. This DID NOT fix the trans. But DID get them home. Bob Dunahugh.
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