RPM transmissions IMO builds the most stout C5/C6 trans/diff packages for heavy hp and torque. The IRS most likely will cost u way, way more than other rear end set ups if you plan on mimicing the vette set up. Jakes Rod shop gave me some info awhile back ago about a shop that is building IRS rears the more conventional way. I believe using a 9" ford housing, but could be wrong. Check with JRS.
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