yes i know the answer!!!!!!!!

The 4x4 cossie drive shaft is on the shorter side of acceptable (according to ford )....so when you lower it they tend to stress the cv joint and fuckup pretty quickly....SO to overcome this problem use a xr4x4 driveshaft it'll fit straight in and wont give you the hassle of the gen cossie 1.

Its same diameter and looks to the naked eye the same as the cossie 1 but in fact its slightly longer and wont die!

CheeRS
Dan