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With the small tire and low rpm motor you'll be lookin for 4th gear with the 4.56. I spin 7000 with the same size tire and 120 + mph.



now after looking back at the 1st post. i thought it said 6300 rpms, so yes 4.10's are the right choice with a 5300 rpm motor. with your rpms and a 4.56 gear you'll be hunting for another gear.




Great 4.10 sounds good.

Low 9’s WOW, I’m in a different league. Maybe I’m wrong but I’m crossing my fingers for high 11’s




FWIW I went from 410's to 373's in my dana, and saw no et change. also with a 28" tire.

Your engine is big and torquey, so I think less than 410's is your best bet.

As for strength, you are very clearly at the limit of 8 3/4 durability.

I felt I was there with my 8.75.
Then I saw my buddies SB 388 make a 727 turn into pieces the size of pocket change, I decided it was time to upgrade some of my stuff.

So I bought all the good internals for my 727, and switched to the dana.

You can't put a price on body parts(human ones anyway ).