I dont have any experience with a Trutrac but I like to use the Powerlok differential like the 68 and older 8 3/4's used, you can set them up aggressive or normal depending on how you want it. Dr Diff has reproduced them so you might think about these unless you have already made your decision.


https://www.doctordiff.com/8-3-4-clutch-type-sure-grip-powr-lok.html