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you should have a 722.3 transmission. it does have a b2 valve in the valve body, but i believe you are referring to the b2 piston. the b2 piston is what applies the b2 band around the k2 drum. these are notorious for getting cocked in their bore and breaking or leaking. it is fairly easy to repair if yours is broken. just do a google search for 722.3 b2 piston repair
92 300 4matic:Is my trans a 722?& do I have a B2?
