how much power do u think a beefed 4th gen rear could handle. by beefed i mean and eaton posi with 30+ spline axles and 3.73 gears. im planing on putting in a 350 with about 400-450 hp and possibly a 100 shot of nitrous. will the rear hold up to this?

 

i would say so but, a few will disagree i'm sure.

 

it will hold until the first pass with slicks typically. i've blown them up before on built up LT1s on the street but sitting on a slick

 

There's really no way to know for sure. Some people have 10-bolts running 10 second ET's over and over, and others have blown up 10-bolts running 13's.

You're on the right track with a better posi unit and larger axles. Have you considered a rear end girdle/cover, too?

 

supoosably the girdle/cover can make a world of difference . Summit offers a nice heavy duty looking rear cover for 130 should eliminate a lot of flex.

If it makes any difference my neighbor races 1 behind his scca sorta street car with 400-450 hp running 10 in slicks and has had no problems for the past few years/races with a locking rear diff.

 

thanx for all the help guys. i am gonna be doing mostly drag racing so is eaton my best option or are there better alternatives for my aplication? If anyone is selling a 4TH GEN REAR im interested./

 

3rd & 4th Gen 10-bolt rears are the same thing. You may think you are strengthening it, but you will get the same results if you abuse it.

 

i thought that the 4th gen rear was 7 5/8 and the 3rd gen rear was 7 1/2. am i wrong?

 

GM change the Dia of the ring gear at some point during the 3rd Gen run. But it was the same or No difference to the so called strength of the 10-Bolt rear.