Quote:
Originally Posted by M.B.DOC
Most likely the reverse clutches are worn to the point that the reverse clutch piston is hitting the 3rd gear clutch drum.. common problem.
IF you have it fixed now you won't need a new or rebuilt trans.
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M.B.Doc: I'm looking at the sectional view of the transmission. It appears that the "Lamellar brake B3" has the friction plates between the transmission case and the Ravigneaux planet gearset. Therefore, when driving in any forward gear, the friction plates rub against each other at considerable speed. This results in wear, even though the reverse piston applies no force against the brake B3. By comparison, on my '69 280SL, (K4A025) there are brake bands that are relaxed in 4th gear and there is no wear. This is also true for the later transmission W4B025 used until approx. 1979. I'm asking why did MB change from a successful design?