Clicking in rear differential after hard launch.

[St1nger Guy]

As the title says, I did a hard launch and after I now have a clicking sound coming from the rear diff. I've checked the brakes, half shafts and CV joints with a stethoscope and have verified the clicking sound is coming from the rear differential itself and then transmitting to both of the rear wheels. From outside of the car it sounds the same from both sides, not a clunk, just a clicking sound. It usually happens at low speeds or even stopped and putting it into gear, light throttle or coasting. Sometimes just getting out of the car after shutting it off it will click. My question is, has anyone else have this happen after launching it? The car hasFBO, ECU and TCU tunes with WMI. The ecu tune allows it to build boost on launch like the brake snip mod and I'm probably close to 500whp. This is on a 2018 AWD GT2. Has anyone rebuilt a rear differential or replaced it? I'm mostly trying to determine if this is a job I can tackle myself of if its dealer time. Thanks for any advice.

 

[D.J.]

Do these links help

https://www.kstinger.com/front_differential_carrier-548.html

https://www.kstinger.com/rear_differential_carrier-547.html

 

[St1nger Guy]

Mine is the rear differential not the front. I know how it has to come out, but thought I would see if anyone on here has actually done it to gauge how difficult it is. I do appreciate the effort though and looking at those instructions make me happier that it's the rear diff that I'm having problems with.

 

[NS_Stinger]

I'd retorque your lug nuts, are you running spacers?

 

[St1nger Guy]

I'd retorque your lug nuts, are you running spacers?

I am running spacers but the sound comes from both sides. I took one wheel off and checked the spacer nuts and they were all good. I just drained my rear diff oil and it was clean, no metal flakes. Other than the random horsing around I baby the car. I'm only putting about 3k miles a year on it. I just sent it a little to hard on the launch. I wish I had draggy'd it cuz I bet I was at around 3.4s 0 to 60 or better. I guess if I can only do it once though, not really something to say it can do.

 

[NS_Stinger]

I am running spacers but the sound comes from both sides. I took one wheel off and checked the spacer nuts and they were all good. I just drained my rear diff oil and it was clean, no metal flakes. Other than the random horsing around I baby the car. I'm only putting about 3k miles a year on it. I just sent it a little to hard on the launch. I wish I had draggy'd it cuz I bet I was at around 3.4s 0 to 60 or better. I guess if I can only do it once though, not really something to say it can do.

Okay, I had a similar problem develop and it was my 20mm spacers in the front. I ended up just removing them in the front and kept them on in the back and no issues since.

 

[Rodtheviking]

Check the flex joint or rubber coupling at the rear of the driveshaft.

 

[St1nger Guy]

Update: I also had a BMS rear differential brace installed which I removed thinking I'd have to take the car to the dealer. I didn't intend for that to fix it, but after removing it the clicking stopped. I suspect I may have bent the brace slightly which caused the diff to be at an angle making the flex coupler click. I don't really know for sure but it hasn't clicked once since removing it. I'm still worried something might be going but until it comes back I guess I'll just drive it how I always do and see if something explodes. Kinda sad that the diff brace had to be removed since the whole point of it was to help with launches. Maybe they need make a beefier version for 500whp stingers.

 

[G70LEbyAdoom]

Update: I also had a BMS rear differential brace installed which I removed thinking I'd have to take the car to the dealer. I didn't intend for that to fix it, but after removing it the clicking stopped. I suspect I may have bent the brace slightly which caused the diff to be at an angle making the flex coupler click. I don't really know for sure but it hasn't clicked once since removing it. I'm still worried something might be going but until it comes back I guess I'll just drive it how I always do and see if something explodes. Kinda sad that the diff brace had to be removed since the whole point of it was to help with launches. Maybe they need make a beefier version for 500whp stingers.

Talk to terry about getting it replaced, You may have gotten the version with shorter bolts that was part of the original release if I remember correctly.

 

[AkuzaSTNG]

So I’ve been dealing with this exact same problem for some time now. It is the rear diff brace making the noise you hear. Something along the lines of the metal rubbing together cause the noise. When removed it goes away completely. I’ve tried grip tape between to alleviate the problem but it came back. Just upgraded the diff bolts to the tork arp bolts so will be removing the diff brace for now. But it is 100% the diff brace