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.... so the Coan sprag for a TF is an exact C-6 piece ?



Yes a Coan sprag come with a new inner and outer race that uses a C-6 sprag assembly.

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4