I did some research I have a 1988-1991 EFI R150F 5sp 23 spline 3.83 V6 3.0L Chain driven Forward Shift . The duals I bought came out of a pick up with 22re(21 spline) I will need and just ordered the 23 full spline input from marlin. The rear case does have a 23 spline it's a 4.7 anything else I'm missing? Thanks again
