can a slipping transmission be saved ? - TCCoA Forums
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post #1 of 7 (permalink) Old 05-26-2018, 06:05 PM Thread Starter
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can a slipping transmission be saved ?


I'am looking at maybe buying a used 1997 Thunderbird with a "Slipping transmission"..

car has 262000 miles and the current owner never serviced the transmission from what I know.

could it be something simple like it needing a filter and fluid change? or maybe a 1-2 accumulator? or pressure solenoid ? or Range sensor?

or should I pass ?
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post #2 of 7 (permalink) Old 05-26-2018, 07:49 PM
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Unless the fluid level is low, a slipping trans is a dead trans, and with 262K and no fluid changes, I’m amazed it made it that long. I wouldn’t necessarily pass on it just due to the trans slipping, since a good used 4r70 is not that expensive, but the overall lack of maintenance on a car with that many miles likely means it will have many other problems come up once you start driving it.

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post #3 of 7 (permalink) Old 05-28-2018, 08:54 AM
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Depends on how bad its slipping. When my transmission started slipping at low RPM going uphill, replacing the trans fluid with Mercon V cured it. (several years ago, but as I recall, I had previously used a one-fluid-fits-all product) But if it's been neglected for too long its probably terminal. You could tell them purchase is contingent on a test drive after they properly replace the fluid.
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post #4 of 7 (permalink) Old 05-29-2018, 07:46 PM
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You can baby it and go light on the throttle .. but once it starts slipping, its going to get worse and fail. But yeah those clutches are probably toasted.

Changing the fluid is one of the worst things you could do at that point - all of that friction material suspended in the fluid is the only thing making it work. I wouldn't be surprised if that's why this one started slipping - if the fluid isn't black, it was probably changed with who knows what.
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post #5 of 7 (permalink) Old 05-30-2018, 09:17 AM
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At 262k miles, if that one isn't a "pass on it", I don't know what is.

Unless the car otherwise is in really nice condition/fully loaded/everything else works, and you're getting it for $500 or less?


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post #6 of 7 (permalink) Old 05-30-2018, 05:27 PM
No, Mr. Lemmywinks, No!!!

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BTW; for anyone with a slipping transmission:

When you feel it slip in the 2-3 shift, with third looking for home, it's time to plan a replacement.

If it slips in 4th (or 3rd) at low rpm, you need a rebuild; the rubber piston seals are wasted, as are the shaft seals.

This is the explanation and rebuild thread for these:

How to: - 4R70W Transmission Rebuild Diary | Ford Explorer and Ford Ranger Forums - Serious Explorations

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.

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post #7 of 7 (permalink) Old 05-30-2018, 06:21 PM
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4r70w sucks to rebuild. I just couldn't figure out where all of these extra parts go or what they do.
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