tranny problem

I have A 92 buick leSabre that drops out of gear when ever I stop. I have replaced fluid and filter and added lucas tranny additive and that stopped the problem for about 6 months but it has recently begun
again. Have thought about a modulator but dont really think that would help. anyone have any other ideas or am I about to drive it to the scrap yard ?
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What do you mean by it drops out of gear? Do you mean that if you take you foot off the brake at an idle, it will not move forward unless you give it some gas? If so, clutch wear. How many miles on the tranny? Does it shift through all of the gears properly? Do the lockup work?
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-Mike-
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After I stop the car it will not move until I give it some gas, and when I do give it gas it slams back into gear. Once that happens I can drive as long as I want without any problem at all (no slipping) until I hafta stop again. When the tranny does drop out it takes very little engine RPM to get it to slam back in, and if ya just sit there long enough it will do it on its own.
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Tranny has 90000 on it and lockup does work
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After I stop the car it will not move until I give it some gas, and when I do give it gas it slams back into gear. Once that happens I can drive as long as I want without any problem at all (no slipping) until I hafta stop again. When the tranny does drop out it takes very little engine RPM to get it to slam back in, and if ya just sit there long enough it will do it on its own.
Lockup may occur later. If you lose enough hydraulic pressure that the clutches are slow in engaging, then you need to find out why.
On an old car, the front pump may be suspect. Thick tranny fluid, leaky front pump, and an plethora of other situation can cause the problem you describe.
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I would have the tranny checked out by a specialist. Sounds like the pump could be failing, but I don't make a practice of giving detailed tranny advice - it is my weakest area of knowledge.
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Agree, Steve. I studied them and worked on them years ago. Lots of things have changed.
Low pressure often leads to his symptoms. Low pressure can come from leaking seals, leaking pump, etc etc.. And in later days, other issues are involved.
mvh
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"I have A 92 buick leSabre that drops out of gear when ever I stop. I have replaced fluid and filter and added lucas tranny additive and that stopped the problem for about 6 months but it has recently begun again. Have thought about a modulator but dont really think that would help. anyone have any other ideas or am I about to drive it to the scrap yard ?" ************************************************ I bought a '92 Century as a winter beater with automatic overdrive which suddenly began to do exactly what yours is doing. It performs flawlessly around town and down the highway but when I come to a stoplight it will act like it's not in gear when I hit the gas to take off. When it first started, I would just bump it up into neutral, and then right back down into drive (overdrive in this case) and it immediatly 'resets' it ( for want of a better term) -- and it then works perfecly normal until next time I stop. I've kind of gotten used to it, like pushing in the clutch and hitting the shifter at a stop with a stick. At any rate I would guess doing _that_ is much easier on the trans than revving the engine until it slams into gear.
I posted in the transmission forum and one of the techs there said it's likely "an input clutch problem" and that, "yes, you can drive it like that until it stops moving." And that's what I've been doing for about 3 months now. Since it's been a particularly harsh winter here with tons of road salt, I drive it everywere i go, several times 100 miles from home. The thread is still there in the transmission forum at batauto.com, the heading is something like "92 Century goes into neutral at stop signs."
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CC&P from a thread in the transmission forum I'd posted in for a similar problem, similar trans. I had stated that when my trans would neutral out at stop signs, I would put it in manual low to get going again. Since then, I've taken to putting it in neutral and then back to overdrive to get going again, instead of manual low. "You may have had parts go bad but now you most likely have and input clutch problem, you use 3rd clutch & third roller in man low which will over ride the input clutch. I do not recommend Trans-x for any reason. The vacuum modulator should be checked but it is probably too little too late, disconnect the vacuum line from the modulator and look for any fluid inside the vacuum port. there is nothing electric that could cause a "no forward" in that year trans. I have never heard of adding extra fluid to a Gm unit except to check for "filter drop", where it is common practice to add an extra quart to Ford because the factory under-filled them on purpose. The "TV cable" on this trans controls shift timing only, the modulator controls shift strength but even if the cable were broken completely it would not neutral out at a stop. I just don't see anything "Minor" that could be causing your issue. Sorry, Transman"
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