I slowed to a stop after car just completing 300 mile trip. With foot on brake moved shifter to reverse. I tried backing up but no action. Then let rev's drop to idle & put in drive. I moved fwd slowing with a clanking sound from trans. I stopped car after driving slowly about 50'. Can anyone pinpoint the problem? Car has 88,000 miles & hasn't dropped drop of tranny fluid.
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83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts, 5 spd