I took both shims from the outside and moved them to the inside. I was afraid it would be too tight, but it seems fine. Drove the car around in tight circles on and off the throttle and it's fixed. Luckily i caught mine early enough too i didn't have to replace any gears. My only concern now is not having any shims on the outside between the diff case and cup. I could immediately notice after taking the shim away from the outside that it didn't turn as free against the plastic case. Cuda, Did you put any shims back on yours? I'm afrais the heat build up there could cause some melting issues on the diff case? But not sure if i was to re-shim the outer i would still be able to fit 2 shims on the inside. The pin obviously wouldn't go in as deep to let you access the hole. Guess i'll try it this way and see how it holds up. I'm running 5200 lipo's with a Novak 8.5, it's hooked. been neating up on all the xxxt's and T-4's at my local track. The only bad thing about this truck is the tires don't work on the rear, unless it's a super heavy track. IMO. I put some Bow Ties on the back of mine and it's so stuck now i can't the pu8sh out of it.