I recommend Enrique at MB Motors in Tarzana. He doesn't work on trannies, per se, but when mine went he knew exactly where to send it at a great price. It's now like new. Best MB mechanic in the SFV, IMHO.

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'91 300D 2.5 Turbo 330K
'00 VW TDI Golf, 190K
'67 BMW R50/2
'73 Norton Commando Interstate