[SRT-OSO]

I'm at wits end. I have a 2010 Dodge Charger AWD that I did a rear diff swap to the Getrag 226, brand new axles. The first one was opened up and the HHP Z06 clutch packs were installed, fresh 75-90 fluid and Mopar additive. Damn thing clunked like a monster. I had it up on a lift and there appeared to be excessive lash because I could spin the driveshaft about 1" in rotation and then "clunk" in the diff itself.

Long story short, I got frustrated and bought a second one thinking I had a bad diff first time around, but the second one is exactly the same! I am so damned frustrated. I have dumped so much cash into this car doing all new suspension, BC Coils, BBK's front and rear from Todd at TCE and I'm getting ready to swap a 6.1 into this beast.

I'm ready to ditch the Getrag and go with an 09-14 cast unit with a Wavetrac. I have searched and searched, but I haven't found here or anywhere a solution to this stupid clunk. It makes my ride sound like a P.O.S. I'm embarrassed to put anyone in the car because almost invairably they ask "What's wrong with your car?"

Help!

 

[Hemihackman]

Is the trans hitting the subframe? Mine clunks sometimes also.

 

[Hemihackman]

Sorry the front of the rear end hitting subframe?

 

[SRT-OSO]

Not that I’m aware of. When it’s on the lift it comes from inside the diff.

 

[gapi]

Dang, that's a lot of bad luck. AWD you say, I take it the FWD is disabled.
I run a Wavetrac like you are speaking of but only putting down 450hp/460tq at the rear wheels. I was surprised to see Wavetrac lists one for the HellCat now.
I really have enjoyed the diff for several k miles now but no drag slicks or lots of low tire psi launches.

Here is a Line lock launch that spins through 1st 2ns & 3rd. My first time trying it out with a Tazer I had just picked up. Pure rookie had it in drive the whole time.

 

[Hemihackman]

How many miles on both Getrags? I bought a 2013 SRT8 rear cradle complete rotor to rotor. The 3.08 was pretty tight -When I got a 3.73 Getag, this was much looser.

 

[gapi]

Fun Stuff. This is the Getrag Specs.

1. Final ring gear backlash should be (0.008 in. +/- 0.005 in.).
2. If backlash measurement is less than 0.08 mm (0.003 in.), it is necessary to decrease the shim thickness on the ring gear (left) side, and increase the thickness on the pinion (right) side.
3. If backlash measurement is greater than 0.34 mm (0.013 in.), it is necessary to increase the shim thickness on the ring gear (right) side, and decrease the thickness on the pinion (left) side.

The open diff requires the case be stretched no more than 0.012", bearings and snap ring shims installed, and then let off measuring for a retained spread of 0.007 to 0.009".

Get someone who cares to do the job. I did my own and fabbed up the stretcher myself. An industrial machinery maintainer and machinist since 1983 I do all my own caring.

 

[Hemihackman]

Nice fixture!