At what point does this become marginal? M6, 4.10's

 

I think the Eaton is a better posi unit then the stock torsen. I have seen the flut/planatary gears destroyed in a basically stock M6, the eaton unit has thicker/stronger planatary gears. Limitations i would say depends on what rpm you are dropping the clutch. M6s are very hard on the 7.5 GM rear, on an A4 the rear is more forgiven.

 

It is in a Strange 12 bolt.

 

Will it hold up for high 9 sec. runs?

 

Having problems with mine at 11.5 @ 120 on hoosiers

 

I will have to go spool, Then dana 60.......then dana 60 w/spool...

 

The dana 60 should solve any problems. With a spool it should be bullet proof. Good luck with the 9's.