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Well the 8 3/4, 3.73 Suregrip is all narrow up, completely rebuild ready to install. What brand & weight of gear oil are you guys running? Are you running an additive for the Suregrip or are does the oil already have it in there? Thanks, Steve / MOhorsePAR

Well the shop is narrowing an 8 3/4 to fit under my '73 Dart. The next step is welding on the spring perches. What pinion angle do i want? I read some where that it should be around 6 to 8 degrees. Where is that measured from, above the centerline or below and what is the optimum angle...