When I first got my car it would bang into every gear. I had a vacuum leak and the tranny wasn't getting any. Get used to vacuum leaks these cars have a bunch of them.

A Mityvac is as important as a spare tire with these old cars, get one.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200