I have a high angle of operation on my front driveshaft, and it was a little too short because of the 8" of lift on the front of my truck. Since I cannot correct the operating angle without messing up my caster, I got an offset 1310 u-joint from Tom Woods Custom Driveshaft Shop ($65 total with shipping and every thing), which (along with a little grinding of the shaft u-joint coupler) allows 30* of operating angle (at slower speeds, not freeway speeds).
I also bought a 1" Superlift driveshaft spacer (part #4310) from Summit Racing ($68 with shipping and everything).
I also bought a 1" Superlift driveshaft spacer (part #4310) from Summit Racing ($68 with shipping and everything).