IMHO, $216 to do what you described is very fair. Most places don't know much about the internals - many just want to sell you a rebuild. I believe the reverse bands wear down when the pressure on the B3 piston due to worn seals is insufficient. Then the clutch pack slips causing rapid wear.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.