Rear end torque, thump.

bmwci323 · 08-31-2012, 08:03 PM

My issue has been persistent since I bought the car, diff bushings changed , subframe reinforced.

If I don't do a smooth clutch release or clutch depress , I will get a thump,thud.

I have taken videos while releasing the clutch and thumping the diff, each video was taken on separate mounting points and overall diff views

An odd point to add - the thump isn't apparent underneath the vehicle in the back . It's loud and distinct while sitting in the cabin , but theres no such noise underneath, only the click off the half shafts.
There is complete movement happening on my whole rear end. Exhaust , shocks and springs will compress a good inch , but there differential is solid in place.
This problem has just been such a nuisance

Maybe it's spring shock related? What about tranny mounts?

choxor · 08-31-2012, 08:48 PM

Get it on a lift.

E46_330i_Stud · 08-31-2012, 08:59 PM

Stabbing in the dark here but like ^ said, get it on a lift and check the Guido, driveshaft & also the shock mounts. That should be a good start at least.

bmwci323 · 08-31-2012, 10:12 PM

Quote:

Originally Posted by E46_330i_Stud

Stabbing in the dark here but like ^ said, get it on a lift and check the Guido, driveshaft & also the shock mounts. That should be a good start at least.

I hope I dont have a Guido under my car, on second thought..

Yeah ill check it out, my shock mounts are in good shape.

bmwci323 · 09-02-2012, 05:38 PM

Well my shock mounts are fine, as for the tranny mounts, the fluid has leaked out of both of them. Therefor, I'm going to take a video of them while engaging the thump.

peytonracer4 · 09-02-2012, 05:44 PM

Quote:

Originally Posted by bmwci323

I hope I dont have a Guido under my car, on second thought..

Yeah ill check it out, my shock mounts are in good shape.

He meant guibo. It's the flex disk between the trans and driveshaft. There should be no cracks or signs of wear on it.

bmwci323 · 09-02-2012, 06:16 PM

Quote:

Originally Posted by peytonracer4

He meant guibo. It's the flex disk between the trans and driveshaft. There should be no cracks or signs of wear on it.

Hah. Yeah I know what it is. I had to get a new bolt for it since one was missing, I ended up buying a new one anyways, because I thought it was worn.
I might just install it for the hell of it.

08-31-2012, 08:03 PM	#1
bmwci323 Registered User Join Date: Oct 2010 Location: ? Posts: 261 My Ride: 00 323ci View My Garage	Rear end torque, thump. My issue has been persistent since I bought the car, diff bushings changed , subframe reinforced. If I don't do a smooth clutch release or clutch depress , I will get a thump,thud. I have taken videos while releasing the clutch and thumping the diff, each video was taken on separate mounting points and overall diff views An odd point to add - the thump isn't apparent underneath the vehicle in the back . It's loud and distinct while sitting in the cabin , but theres no such noise underneath, only the click off the half shafts. There is complete movement happening on my whole rear end. Exhaust , shocks and springs will compress a good inch , but there differential is solid in place. This problem has just been such a nuisance Maybe it's spring shock related? What about tranny mounts? Last edited by bmwci323; 08-31-2012 at 08:05 PM.

08-31-2012, 08:48 PM	#2
choxor Fully Deeked Out Join Date: Nov 2010 Location: Atlanta, GA Posts: 2,839 My Ride: An Automobile View My Garage	Get it on a lift. __________________

08-31-2012, 08:59 PM	#3
E46_330i_Stud Registered User Join Date: May 2010 Location: Wake Forest, NC Posts: 1,891 My Ride: 2004 330ci ZHP 6MT View My Garage	Stabbing in the dark here but like ^ said, get it on a lift and check the Guido, driveshaft & also the shock mounts. That should be a good start at least. __________________ 1995 325i 5mt ArcticGrey/Dove - SOLD 2004 330ci ZHP 6MT SilberGrau/Black - SOLD 2001 330i M-Sport 5MT StaulGrau/Grey - SOLD 1992 Accord LX Sedan 275k miles all original - DAILY 2002 Chevy Suburban LT Autoride - TOY HAULER 2005 GMC Sierra 2500HD SLT - RACE TRUCK!

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09-02-2012, 05:38 PM	#5
bmwci323 Registered User Join Date: Oct 2010 Location: ? Posts: 261 My Ride: 00 323ci View My Garage	Well my shock mounts are fine, as for the tranny mounts, the fluid has leaked out of both of them. Therefor, I'm going to take a video of them while engaging the thump.