Very cool setup! Here is a link to some truetrac info. In post #5 Andrew Cammer from GPI confirms that it will work with all 218 mm ratios. I just installed mine with AAM 3.91's. You can send him a pm with any questions.
This is from the Eaton site: A quality, petroleum-mineral based, GL5 rated 80w-90 gear oil should be used. Synthetic oils are not recommended for Truetrac applications.
https://www.camaro5.com/forums/showthread.php?t=609452
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2013 2SS GPI built & tuned 415, spec'd by Andrew Cammer. GPI ported intake/tb/heads, Tooley springs, CHE trunnions, Callies rotating assembly, Diamond pistons, GPI SS3 VVT, ATI 10% ud damper, Circle D 3800, Kooks ceramic coated lt's with green cats, Mishimoto rad & oil cooler, Derale trans cooler, Holley efi rails. DSS driveshaft, trutrac with 3.91's, G-Force renegades, Hendrix solid cradle bushings Bmr: poly diff bushings, Strange adjustable coilovers, sub frame connectors, ZL1 npps, controlled with a vac pump & mac boost control solenoid.
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