Here’s a little tidbit we never realized. If you have a Spicer T-case and the output shaft has a hole in it for a cotter pin, the yoke nut threads are 3⁄4-18. If there’s no hole, the threads are a 3⁄4-16. You can readily buy 3⁄4-16 nuts, but the 3⁄4-18 nuts are only available through special-order vendors. Tillford reuses the stock 3⁄4-18 nuts and indexes for the cotter pin.