s-10 driveshaft.

whats the deal with having to shorten them when you ag the rear? how much or does it vary? i've heard 1" but not sure. thanks. it is a 2 pce shaft on a long bed. thanks

more info needed, is it a sucide doors kit? kp 6link? do you have shorter lowers? did you move the perches?

IT WILL PROBABLY BE A UNIVERSAL 4 LINK.