The 722.3 transmission on my 1981 380sl with app. 200k miles on it is starting to slip in reverse, and my research indicates that the slipping is due to a worn B3 clutch pack that has no external adjustment.

However, a local transmission specialist, who seems to know quite a bit about these trannies, suggested that he might be able to remove or significantly delay the problem by adjusting the "reverse servo," which can be accessed externally.

My question is "can reverse on the 722.3 be adjusted this way," and if not which of the following would be my best option:

1) Have him or another specialist rebuild my B3 clutch and inspect the rest of the unit for app. $750 including parts and a 6 month warranty; or

2) Replace the existing tranny with a used one with app. 100k miles on it from a local salvage yard for $400 + $350 for a specialist to install it. Although this used tranny would have a 90 day warranty, if it ends up being defective, I would have to pay another $350 to have it removed and replaced with God knows what.

Of course, the best thing to do would be to have the whole unit rebuilt for app. $1650, but the cost of doing that is prohibitive at this point.

Thanks very much in advance for your, usual, well-informed opinions.

Steve