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Old 01-25-2002, 10:59 AM
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Unhappy 450 SL transmission problem

I recently purchase a 1977 450SL with 170,000 well maintained miles. On my way home with the car from Kansas City to Arkansas, I noticed that the car stopped upshifting from 1-2. It will shift by letting off the accelerator. Also, on the 2-1 down thift there is an audible thump in the transmission. It goes into reverse fine though. The transmission fluid is brown so I ordered a gasket and filter set and plan to change and see if that helps, I've also read that the B-2 piston on these models is a problem. Any suggestions?

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Old 01-25-2002, 11:20 AM
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450 SL tranny

I'd say your starting on the right track by changing the fluid. That could make a big difference. Be sure they (you) change the torgue converter fluid too. I believe the B2 piston affects reverse first. Not sure, anyone? It's referred to as catastrophic transmission failure. That's enough to scare the **** out of ya.
'79 450SL
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Old 01-25-2002, 03:25 PM
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Electrons can do anything
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,071
Brown fluid - very bad sign. Depending on how often the fluid was changed you could cause the tranny to fail by changing the fluid. I have it from several dependable sources that if the tranny has not had regular fluid changes, when you put fresh fluid in, they often fail within a few months of the change.

The B2 piston is not used for reverse at all.

Its my guess that you are in for a rebuild soon.
I got too many cars!! Insurance eats me alive. Dave

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