Unfortunately the Cobra IRS friendly shops that I know of are here in Tampa. S&R Performance has done a couple IRS swaps into different cars and have had numerous IRSs in for repair and troubleshooting including mine. Is your gear oil getting low?

While the IRS is out, there is a whole laundry list of things that can be done, but you may choose not to invest in delrin bushings and all the rest of it. Fuel filter, carrier bolts. There are volumes about this on svtperformance.com..