Hello,
I have a 1989 740 turbo. it had been parked for a few years and got it back running, and i noticed there was a "klunging" noise coming from the driveshaft when i would shift into reverse. Then i was on my way to school and it sounded like i hit a milk crate and it was stuck under my car, then really loud clunking noise, so we took the driveshaft off and the boot was ripped up, so we had the driveshaft rebuilt, and installed it today. we went to test drive it and was still making the same noise. We noticed it look like and felt like the rear brakes were locked up. so we changed the rear back pads, and cleaning up the calipers, and wheel hub. After then we test drove it again and it is stil making the same noise. i put the car in neutral and rolled down a hill and it will not make the noise unless it is in drive. at slow speed under 5 mph it is fine. once you speed up, this hellaous noise comes from the rear end. we have checked the rear end oil along with the transmission fluid, all is fine. something else i noticed today was that the service light came on. sorry about the spelling errors, any help is greatly apperciated. also does anyone know how differetial backlash sounds?

justin

p.s.
some other work that has been done on the car recently.
new battery
fuel injectors
fuel pump x 2
fuel filter