Stock T56 and 4.30 rear diff

[nath]

I am converting my 3rd gen RX7 to a LS1/T56 drive train. I have 4.30 rear gear in the car now that worked real well with the stock mazda tranny and a 5th gear from a mazda suv.

This is a road course car.

Anyone speculate what I might expect with the 4.30 with the T56?

Should I go back to the stock, I think 3.90 rear gear?

[Cutlass]

The only possible downside I can see would be traction issues. Otherwise that gear is well suited for a LS1/T56 combo.
If you do have traction issues that you can't solve with tires and suspension mods, then go ahead and try the 3.90 gear