650+ RWHP rearend build up 8.5

[1000MileStylez]

this is a "weekend" warrior, i got the rear

And i was just going to do a full spool
30 spline axles, new housing ends, 3.42's
stock brakes, alluminum drums and the TA rear girdle.

unless you guys think otherwise?

 

[broke1]

9 inch with detroit locker with 3.50 gears


Whats your combo ????

 

[CopGn]

Instead of a spool you can go with an Eaton posi. They have 2. One at 400lb and one at 800lb. They say the 800 is almost like a spool. Do a search on Eaton.

 

[1000MileStylez]

setup is

GN1's
billit mains, girdle
LT72 turbo
th400 w/brake

 

[lazaris]

If your going with a brake I would go for the 9". The ring and pinion arangement in the ford is stronger. Which becomes the weak point for an 8.5" once its beefed up.

 

[lazaris]

Just about the same set up here. 9" Nodular case, Detroit locker 35 spline axels, (and for an added measure of strength) I added a pinion support . For what its worth there were few tests that were conducted comparing the Ford 9" to a 8.5 GM rear. In the ET department the tested cars with the 9" lost only a few hundreths in ET compared to the 8.5. Still a loss but not as dramatic as some suspected. The strength increase and piece of mind however is worth it to me.

 

[wbrophy]

I have a 9" with a detroit locker in my 82 big block F-body street/strip car for many years, car weights 3900 lbs. w/driver and pulls 1.4's on good days and I have never broke a thing in the rear.

 

[strikeeagle]

You didn't say you were opposed to a 9". If not, spend the extra $1K or so over what you'd dump into your 8.5 only to end up with a weaker set-up and make it bulletproof...