Reverse stall in a trans without a lockup converter is very odd, unless the motor is having an issue like a vacuum hose opening up due to the motor moving.

A broken accumulator piston might cause this. On domestic trans I've seen check balls wear through the separator plate and cause all sorts of odd behavior especially if the check is a 3 way not the normal 1 way.

Found this: ( more at the web site ) , while the unit in question had no fwd and good reverse, I wonder of your valve body has something jammed in it giving you a drag race trans brake.

TRNi | Transmission Rebuilders Network International, Transmission Rebuilder, Transmission Repair

Subject: MERCEDES_722_3, No forward, solid reverse
Date: Fri Aug 2 11:48:01 PDT 2002
Subject: MERCEDES_722_3, No forward, solid reverse

Hi All, The VIN says this is an 81. Yes it is a 6 bolt pan 722.304. We pulled the servo cover and as several of you have suggested, the servo was broken. My dealer said $122.50; pricey little bugger. Once we get it back together and working then I will post the fix. Thanks to all that replied and especially to Don Stone and Tranibob for the help. Thanks again, Jerry

Jerry Martire - Shirlington Transmissions
transmission_doctor@worldnet.att.net
TRNi Member Since: 9/5/00 (7 | 153)
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FIX:

Date: Wed Aug 7 05:11:05 PDT 2002
Subject: MERCEDES_722_3, No forward, solid reverse

It's fixed! We installed the new B2 servo but still no go. I decided to drill the B2 servo cover for a pressure guage to verify wether we had a hydraulic problem or a mechanical problem. This test showed no pressure on the B2 servo, so I knew for certain it was a hydraulic problem, so we pulled the valve body again and went through it with a fine tooth comb. Found that the B2 shift valve was jammed by a piece from the broken servo. Put it all back together and everything worked great. Thanks for all the help. Jerry

Jerry Martire - Shirlington Transmissions
transmission_doctor@worldnet.att.net
TRNi Member Since: 9/5/00 (7 | 153)