Hello everyone!
I recently finished redoing my entire suspension. I had the subframe and diff separated but did not open the diff...only thing I did to the diff was clean and paint it. I finished reassembly and took it for a drive and right when the clutch engages, and the drive line gets loaded, I hear a clunk. Once I am moving there are no weird noises or vibrations...but when I push in the clutch to change gears it clunks, then when I let out the clutch to engage the new gear it clunks. But my buddy said he couldn’t hear it from outside the vehicle (car running). Also, there is no rear interior in the car.
So this weekend I built some ramps to get under the car with the suspension still loaded, I checked all of the bolts and they are all torques to spec. I then put it in gear and had a buddy slowly rock the car forward and backward and the clunk was extremely obvious (could actually hear it outside the vehicle with no exhaust noise). I climbed under the car while he continued to rock it and the sound is definitely coming from the driveshaft/diff union. First thing that came to mind was U-joints, I took off the driveshaft (one piece) and the U-joints are fine.
If I rotate the input of the diff back and forth I can hear the clunk...so now I know the clunk is from the rear diff. I measured the rotational motion of the input to be 2.5 - 3 degrees. I checked the TSRM but I could not find any backlash specs in degrees...only in mm.
I know I have heard of LSD diffs making noise, and I honestly don't know if it made the noise before I did the suspension.
Here are a few thought I have:
- The clunk is normal and I just couldn't hear it in the vehicle in the past because the interior was installed and the suspension wasn’t very stiff so the noise was damped out enough. However, the noise is more obvious now because I have no interior and I have stiffened the suspension so much that the clunk is not be damped much.
It just seems weird that it would start all of a sudden when no work was done to the diff...
The diff has fresh royal purple max gear in it.
Does anyone have any insight/thoughts on this? Is this noise normal? If not, any idea what it could be?
Any input is appreciated!! Thanks!
I recently finished redoing my entire suspension. I had the subframe and diff separated but did not open the diff...only thing I did to the diff was clean and paint it. I finished reassembly and took it for a drive and right when the clutch engages, and the drive line gets loaded, I hear a clunk. Once I am moving there are no weird noises or vibrations...but when I push in the clutch to change gears it clunks, then when I let out the clutch to engage the new gear it clunks. But my buddy said he couldn’t hear it from outside the vehicle (car running). Also, there is no rear interior in the car.
So this weekend I built some ramps to get under the car with the suspension still loaded, I checked all of the bolts and they are all torques to spec. I then put it in gear and had a buddy slowly rock the car forward and backward and the clunk was extremely obvious (could actually hear it outside the vehicle with no exhaust noise). I climbed under the car while he continued to rock it and the sound is definitely coming from the driveshaft/diff union. First thing that came to mind was U-joints, I took off the driveshaft (one piece) and the U-joints are fine.
If I rotate the input of the diff back and forth I can hear the clunk...so now I know the clunk is from the rear diff. I measured the rotational motion of the input to be 2.5 - 3 degrees. I checked the TSRM but I could not find any backlash specs in degrees...only in mm.
I know I have heard of LSD diffs making noise, and I honestly don't know if it made the noise before I did the suspension.
Here are a few thought I have:
- The clunk is normal and I just couldn't hear it in the vehicle in the past because the interior was installed and the suspension wasn’t very stiff so the noise was damped out enough. However, the noise is more obvious now because I have no interior and I have stiffened the suspension so much that the clunk is not be damped much.
It just seems weird that it would start all of a sudden when no work was done to the diff...
The diff has fresh royal purple max gear in it.
Does anyone have any insight/thoughts on this? Is this noise normal? If not, any idea what it could be?
Any input is appreciated!! Thanks!
