In light of all the snapped axles out there I decided to rebuild the Mach's rear end. I put in 31 spline axles, Eaton posi and FMS 4.30 gears. The car pulls so much better now through all the gears. Now 5th gear is totally usable for passing on the freeway. I am not sure what mph is turning what mph yet because I have not recalled the speedo yet.
Jerome
Jerome