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Pop and thumping under seat in Drive - '88 740 Automatic

posted by  someone claiming to be DSG on  Sun Apr 28 14:18 CST 2002 [RELATED]

In my 1988 740 turbo, I was on the highway, when I felt/heard a muffled "pop",then occasional thumping. As I slowed, it got more intense, and the throbbing was at a regular interval, respective to the rpm's, etc... I was told this could be the Universal joint gone bad, and was wondering if it isn't the motor mounts, ot transmission mount. Could this be the fabled Tailshaft bushing seal? Hope not the transmission itself! Yes, the gearshift was jumping up and down a bit too. Only happens in drive or reverse, not park. Any suggestions or help is appreciated - I can't afford a whole transmission replacement! Thanks! DSG






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