Ford 9 in 3.89 Rear Gear REM and Dyno Break In 31 Spline TrueTrac. C&R Racing has introduced current NASCAR Ford 9 in technology for the Pro-Touring and Track Day customers. Starting with an investment cast nodular housing that is almost 8 pounds lighter than a standard case. Ring and Pinions are ISF Process (Isotropic Superfinish Process) by REM Chemicals for reductions in friction, heat build up, power loss
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