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Old 12-14-2008, 01:05 PM
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Join Date: Jul 2006
Posts: 182
Unhappy transmission mystery

At cooler temps in Austin and San Antonio my transmission in the 1987 420sel that I love will actually slip into reverse. When the operating temperature rises to 80C then there is no such hope of sliding into reverse.

Now I believe that transmissions don't necessariy like new fluid and this has happened for the past year or so. When I first traded for the vehicle, I would slide into reverse after a minute or so on a cold morning, but as the temp warmed up, no chance....

I changed the fluid and added a Lucas Transmission Oil thickener thinking that doing so might help the such december and I am back to sliding into reverse early in the morning but that is it....

Ideas anyone?

Lyle in Austin

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Old 12-14-2008, 03:09 PM
jhodg5ck's Avatar
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Join Date: Feb 2004
Location: Atlanta, GA
Posts: 1,405
Count on reverse being Gone in the near's only working when the fluid is cold & thick..

Have you adjusted the modulator pressure? If not I'd give it a few turns see if that helps w/ reverse engaging.

I'd also try swapping the fluid w/ Type F if you are on a budget or B&M trick shift if 5$ a qt is OK... Both of these fluids additive package is aimed at getting clutches to Grab as opposed to slip.


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