I have 12 bolt with the eaton true trac and 410 gears.Im currently running lucas 80/90 gear oil no limited slip additive.I'm do for change on the rear end fluid just want to find out what I should use car is a 6spd if that matters.

 

At the gear shop we always use normal old GL5 with friction additive.

 

you do not need the additive with the tru-trac. it is clutchless. it is just like your ring/pinion meaning it is a gear type center section.

 

Thanx for the info

 

Yes indeed, no additive needed! Bob