Scraping noise when decelerating in gear

[CincinnatiKid]

After autocross yesterday I have a weird scraping noise but only when decelerating and in gear. If I throw it in neutral the sound goes away or if I accelerate the sound seems to go away. I crawled under briefly to look for any obvious damage of rubbing but didn't notice any. Driveshaft U-joints perhaps dried up? any ideas?

[series88]

My friend had this issue and if iirc, it was the guibo or loose bolts. Things kinda tightened up when accelerating and start kinda sagging when let off.

[CincinnatiKid]

One thing to note is that I don't get any vibrations when I hear the noise

[AlphaE]

i have something very similair. But seems to be from the rear end more. If you've ever driven anything w a detroit locker its sound like that. Its only when there is slight pressure on driveline. Full coast it is quite and under acceleration its quite too... Im gonna throw in some friction modifier and see if that helps. You figure yours out? any other ideas out there?? thanks

[bmwm42]

fucked diff

[CincinnatiKid]

i have something very similair. But seems to be from the rear end more. If you've ever driven anything w a detroit locker its sound like that. Its only when there is slight pressure on driveline. Full coast it is quite and under acceleration its quite too... Im gonna throw in some friction modifier and see if that helps. You figure yours out? any other ideas out there?? thanks

yea yours sounds like a toasted diff, not sure on my sound yet, haven't had a chance to take a real good look at it yet.

[AlphaE]

Really... I kinda doubt it..... It comes and goes... Its quite when you start, then when it gets warm, it acts up. But on the way home yesterday,a 1hr drive, it was quite. I did the torque test, one tire in the air thing, it held 53lb. here i go thread jackin..... sorry