Rear knocking when when shifting?

[bluevanilla]

Hi guy,

I hear a loud knocking noise when I am shifting on 1st and 2nd. Specifically, when I step on clutch or step off the gas quickly. It won't happen on higher gear or faster speed. So it's like when I get off gas quickly or step on clutch quickly, i can hear a loud knocking noise from rear. Do you guys have any idea what can cause this?

P.S. I have a 91 318i with 3.73 LSD.

[efficient]

I have this issue but I have condor solid bushings.

[hooken m]

hows the bushing in the rear?

[15Michaeljoseph]

you got anything loose in your trunk?


--Mike

[bluevanilla]

Thanks guys. I will check and see if it is caused by the bushing.

[rturbo 930]

What kind of knocking exactly? Ie, if you let off the gas, does it knock just once? I have a rear end knock when I get on or let off the gas, and it basically sounds like there's slack in the driveline somewhere. I have a hunch it might be my driveshaft.

[efficient]

What kind of knocking exactly? Ie, if you let off the gas, does it knock just once? I have a rear end knock when I get on or let off the gas, and it basically sounds like there's slack in the driveline somewhere. I have a hunch it might be my driveshaft.

This is what mine sounds like aswell. Also when I come to stop with the clutch engaged I can hear the something moving back and forth. Shifting from 1st to 2nd gear will make my knock aswell.

[ST1G]

Check to make sure the drive shaft centre bearing is still bolted to the car.

[bluevanilla]

Thanks guys. It's such a great community here. Eventually, it was those nuts mounted the diff got loosen. Tighten those nuts, problem is gone :) in my case.

[rturbo 930]

This is what mine sounds like aswell. Also when I come to stop with the clutch engaged I can hear the something moving back and forth. Shifting from 1st to 2nd gear will make my knock aswell.

Sounds like mine. If I can get the car to start bucking, it'll do it every time. I have a strong suspicion it's my DS U-joints, and failing that, my subframe bushings. I already did them, but they didn't seat right. Been meaning to fix that.

[mabeer]

Incorrect diff backlash maybe?

Sent from my XT1080 using Tapatalk

[QUKBMER]

Diff mount or Subframe busings or Shock mounts or maybe it's the fact that you didn't keep your hookers in the trunk strapped down tight enough?