8.25 Question

I put 3.91 gears 9 years ago in mine and had 3.21 for 3 years before that. Its seems good to me, I did have a good shop install the gears and used richman's and new ring bolts. For the 3.21's I left the end in the car but the 3.91's I took the rear end out myself and took it down to DTS, they tank it clean and painted black.My albrun limted slip is worn out but its still better that a open rear end. I seen in sumitt racing Eatton has a posi unit but its $550 I think--to much for me right now. Besides, it would put more stress on the axles. Mine chrips the tires on upshifts but I thinks its just the right tire.