Well, I took it into the mechanic. He dropped the transmission out, sent it to the Mercedes machine shop. They replaced all of the exterior gaskets/seals, and checked it to make sure it performed to specifications. The machine shop guy said the big piston was gone, and needed to be replaced, so it was replaced. Front pump was OK. It was bench tested and reset to Mercedes specs.

The total bill came to C$1,100, which included the piston replacement, new fluid and filter, and installing 2 new cooler hoses, which connect to the rad. I had previously bought the hoses, so the C$1,100 does not include the hoses. The piston replacement was C$350, C$300 labour to drop and install the tranny, fluid and filter, replace hoses; machine shop charges with seals was C$280. Elapsed time for the job was 2.5 days.

Comments?

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1989 420 SEL