Yep, I have the same issues with the NP and B-W t-cases, and the yokes won't match from the F-150 and Bronco with the same t-case model. Easiest solution is to swap your stock slip shaft onto a driveshaft that fits the yoke or ****** on the t-case you want to use. I'm going to have to swap the rear yoke and output shaft from a Bronco B-W 13-56 onto my F-350 slip-yoke 13-56, and hope the F-350 yoke fits. The B-W shafts are 32 spline, so it should work. BUt there is some difference in year moels, somewhere around 91-92. Try to stay within the same model range or within a few years to avoid this problem. I have an 88 t-case and an 86 t-case. The NP208 in the Bronco now is coming out since the front driveshaft won't clear the tranny crossmember, and the B-W 13-56 is a tougher case with less miles. JSM84