8.5 rear??? PLEASE HELP!

[deeloc1]

Hello everyone, i am new to the forum and i have a g-body elcamino. i am performing a LS1 engine swap and i have my eyes set on a GN rearend that i want to buy as opposed to buying a power robbing 12bolt or 9". I plan on making around 700+rwhp with N2O. Will a 8.5 Rear with 33spline axles hold up to that kind of horsepower abuse i'f i am running slicks and stalling at about 3800-4000rpms on the track with a 3500lb race weight car? i have heard that these rearends will take abuse through rumors...but i wanted to get answers from guys who actually have grandnationals who are running low 10 and 9 sec E.T.'s!!!!

i guess i'm really trying to ask how much can i throw at a built 8.5 gn rear end 33spline axles, spool etc...??? Any info will be greatly appreciated...thanks guys.

 

[SouthernCal GN]

8.5 GN rear will support 10s- been done many times.

 

[GMV6TURBOPOWER]

jack cotton was running i think 8.80's 158 ?on the bumper with a 8.5 of course with upgrades

 

[RobsIron]

8.5 is pretty much a 12 bolt with a smaller ring gear. Beef it up and you'll be OK.

 

[turbocliff]

I've been 1.35 60 with a 8.5" 10 bolt @ 3500lbs with a SBC single turbo GN making 935RWHP.

Rear had 33spline axles / spool, TA Girdle, Back braced with rectangle tube reinforcement, welded axle tubes, clip eliminators, and billet yoke, and thats about it.