Harrop and eaton trutrac centres are not the same. Harrop are stronger, they use billet material, they are locally manufactured the extra strength and place of manufacture is reflected in the cost. A new Harrop trutrac is in the order of 1500 - 1700 depending where you buy it, an eaton trutrac can be got for half that.

There is absolutely no comparison to be made between a stock LSD limited slipper and a Harrop trutrac, chalk and cheese. The Harrop trutrac can take an absolute beating but keeps tire burn even, ......... even on steering wheel lock, and in a straightline rears leave mirror image black. I swear by my Harrop, predictable, and after 40000km has been bullet proof.

If youre breaking pinions and crown wheels, aan LSD will not fix that. That's incredible that the tonner has been through 5 diff pinions. I've never heard such a thing, even taking into account it's only the 6 cylinder differential.

Is it worthwhile undertaking a V8 Dana conversion?

BIG power / BIG torque cars don't mince diffs as readily as the tonner or your mates, so maybe an inherently stronger case, pinion, crown wheel is the answe?

Good luck.

Tex