Rear End Clunk - Driveline

[Rawyzf]

Dealership Update:

Dropped my car off Fri AM and picked it up after lunch.

They confirmed they can heard the clunking, but said it's normal to have that with IRS. The tech (who I always request to work on my car) said it sounds louder than avg but thought it might be from having the Camaro Diff and Tune. I let him know it's not the Tune, as I've been setup like this for about a yr, and this clunk really only started about a month ago. There has always been slop in the driveline, but no clunk. He said his hands are pretty much tied when it comes to warranty work, because of the Camaro diff in there. He said he could look into it further, but chances are it wouldn't be covered by warranty because of the Diff. (unless it was forsure driveshaft related). But he said everything on the Driveshaft looked and felt good.

So, I am kinda stuck I guess. We talked it over for a bit, and I think the next step will go to the tuners shop and get his opinion on the matter. I am 99% sure it's not tune related though, but he can also help determine what the issue could be. If it's not going to be a warranty fix, I'd rather fix it at his shop anyway since I can go with aftermarket parts if something is indeed wrong.

Not sure when I'll have time to get into his shop, but I'll update this thread when I do.

[youngrushhour]

Thanks... I've read that other people notice a little bump with the gForce axles. I'm not panicking about it right now as everything is still pretty solid in the driveline and even on DRs, I haven't noticed any issues. With all the extra power I have since the Maggie, I'm actually VERY cautious about taking up driveline slack before doing a burnout or launch though... especially now that I see what kind of slop there is in the driveline. The last thing I need is for all that torque to get a running start at my drivetrain!

gForce axles and a noticeable clunk. They definitely will cause some noises and vibrations, for sure.

[Rawyzf]

Problem has been fixed!

Issue: Pfadt bushings in the diff went bad. We switched them to BMR Street Bushings and the clunk is gone.

[Executor999]

Problem has been fixed!

Issue: Pfadt bushings in the diff went bad. We switched them to BMR Street Bushings and the clunk is gone.

That's great news! I hate clunks. Finally getting my driveshaft replaced. Betting money the new power damaged one of the couplings or the rubber cushion of the center bearing. I"ll find out next week. Been waiting five months to take action on this.

[Rawyzf]

I am super happy to have this fixed. The clunk worried me and I wanted to know what it was and always hoped it wouldn't break something.

I have spare rubber couplers if you end up needing some.

[Executor999]

I am super happy to have this fixed. The clunk worried me and I wanted to know what it was and always hoped it wouldn't break something.

I have spare rubber couplers if you end up needing some.

Thanks for the offer, but I bought brand new ones from Pace - the Camaro ones which are cheaper but supposedly better. In fact I bought all new bolts for GR8lover's stock driveshaft. If I break this one, the next step is a Dynotech unit for sure. I don't have a clunk going on but a lot of vibration between 45 and 70mph when accelerating hard.

[Rawyzf]

Cool, no prob. I bought these couplers from the Camaro forum, just incase mine were bad.

Keep me posted on how it goes.

[RuLEoF2]

Hi...

Obviously this is a pretty old thread but I figured I'd post anyway since my issue seems to be the same as what the OP was dealing with. My symptoms are nearly identical to what is shown in his video. I've got more trouble-shooting to try but if my situation is due to bad rubber drive-shaft couplers or the differential bushings that ended up being the cause of the OP's clunking sound, how difficult is it to replace those items? Is it a driveway job or is it something that needs to be done on a lift?

Thanks.

[Rawyzf]

Hi...

Obviously this is a pretty old thread but I figured I'd post anyway since my issue seems to be the same as what the OP was dealing with. My symptoms are nearly identical to what is shown in his video. I've got more trouble-shooting to try but if my situation is due to bad rubber drive-shaft couplers or the differential bushings that ended up being the cause of the OP's clunking sound, how difficult is it to replace those items? Is it a driveway job or is it something that needs to be done on a lift?

Thanks.

The Diff bushings are definately not a driveway job, especially if they are the oem bushing which will need to be pressed or drilled out.

Couldn't tell you on the driveshaft couplers, sorry.

[RuLEoF2]

It's been a while and I tried to get this pinned down but no luck. I took it to a transmission shop and the tech there said that he didn't think it transmission related but rather a bad mount somewhere. I took it back to my regular mechanic and they said that all the mounts were fine. So, I kinda gave up for a while.

Over the weekend, I had the rear wheels off and noticed a fair amount of slop in the drive. Take a listen and tell me what you think. Is this normal?

https://www.mediafire.com/download/moxqeyvgw2vqzga