There is no external B3 adjustment on the 722.3 transmission. The problem is normally a clutch pack where the friction material has flaked off for some reason. Also the reverse piston may have a crack in it and/or the piston seals have gone bad. Best thing of course is a full rebuild, but the B3 clutch can be taken care of by itself. The transmission has to come out for that.

The used transmission most likely will have a B3 clutch that's questionable, so that's a roll of the dice.

I think the transmission your guy is referring to are the 722.0/722.1 units which use a band for reverse that's at the front of the unit with an externally accessible adjustment. The 722.3 uses a multiple disc clutch instead of a band to do the same thing.

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Erich Loepke
2010 Ford Focus
Currently Benz-less