Add your abody driveshaft length for quick reference

If I remember right my 4-speed, 8.75 ended up being 49.25, I do have +1 xhd springs and it sits really high in the rear.
Local driveshaft shop it cost me $280 including tax to build one.
I gave them the tranny yoke, they made one with 3.5" tube and 7290 spicer yokes and spicer u-joints installed.

If you are changing from a 7.25 to any rear check the yoke size.