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Old 08-21-2007, 10:02 PM
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700r4 4x4 1989 reverse gear works half the time

I have a 1989 Chevy 1500 4x4. The truck sat for about a year before I bought it from a friend. The transmission worked fine for about a month or so, then the reverse started to give problems.

Current problem:
Reverse only works when the transmission IS COLD. After it warms up, the reverse doesn't work. It works real good when it is cold after it just starts up, it grips up strong. When it WARMS UP it generally has NOTHING in reverse, if it has anything at all when it is warm, its only enough to hold itin position and not roll forwards on SLIGHTY unlevel gound.

Thought about rebuilding it, but I have no experience with transmissions and wouldn't know a bad looking part if I saw one, besides clutches, so I would probably waste time and money (maybe.)

I read on here that someguys had a similar problem (minus the temperature working vs not working thing) and they just changed the filter and fluid and god did the rest to fix it.

Another guys on here said to someone they used tranny cleaner and changed the fluid and it fixed it (probably with the help of god too)

I haven't done anything to try and fix it YET and problem hasn't gotten any worse which might be a good thing lol.

Whats your guy's opinions?.... anything will help, I'm down to putting horseshoes in my pockets and doing a rain dance.

All help is very much appreciated, thanks in advance.

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Old 08-21-2007, 10:22 PM
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I was trying to look up transmission cleaners and all I found was some stuff called "BG Automatic Transmission Quick Clean and Conditioner" and I went onto BG's web site and it suggested to take the truck to a place with BG servicing equipment and have a "trans flush" to clean out the tranny and get all the crap cleaned out of it..... (which I think will cause MORE problems)

heres the link:


..... beats me what I should do.... I'd rather to this than rebuild it. But I'd rather have a good rebuilt tranny than a questionable one.

The 350 motor leaks oil.... or actually.... it RAINS oil..... so I'm going to be replacing the timing chain and oil pan gaskets which may spark my urge ro pull the motor, if I do, I might want to pull the front of the tranny apart and inspect this reverse clutch/drum deal.... but I won't have time to pull the motor for about 8 months.
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Old 08-21-2007, 11:54 PM
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sounds like you have a leaking seal in the reverse drum or the low reverse clutches when the fluid is cold it is thick enough to make a seal when it warms up it doesnt seal I would say it is time to tear it down
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Old 08-22-2007, 08:50 AM
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I would not "flush" this trans in hopes of a miraculous fix, as this will only "flush" your money from your pocket into someone elses.

It is time to bite the bullet on this trans I think.

By the way, I like that saying, "down to putting horseshoes in my pocket and doing a rain dance".

I think I know what it means, but will you clarify?

If you've not rebuilt a transmission before, I think your decision to abstain is a wise one. How about a visit to your friendly neighborhood transmission shop.
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