Originally Posted by 2006gtmike

What are some options I should look into when upgrading the rear on a supercharged 2006 Mustang GT?

I'm being told that the Eaton 8.8" is the way to go unless I go the 9" route.

I don't think I'll ever need the 9", but I would like the rear to hold up to around 700-800 HP when I decide to upgrade my stock engine block.

Would you recommend I go with the 31-spline axles versus the lesser 28's?

Originally Posted by parchisi

Yup, the 8.8 can handle a lot of power if built right. Aftermarket differential of your choice, depending on how you want to use the car, weld the axle tubes, aftermarket 31 spline axles, and a girdle. That shoule be strong enough to handle most anything you can throw at it.

Originally Posted by 2006gtmike

What aftermarket 31-spline axles would you recommend? Moser?

Which rear differential cover? I like the LPW Cover.

Originally Posted by Simon1

Leave your axles alone. Never heard of someone breaking one of ours from racing.

If you are getting down into the 9's, then yeah, look at a bigger axle and differential.

Originally Posted by parchisi

I dont' know what he's going to be doing with that 800 hp, but if its launching at the strip with some slicks...then I'd say definitely beef up the rear end....among other things. If he's just going to be screwing around on street tires on the street, then its probably not necessary.

Originally Posted by 2006gtmike

I'd be running it occasionally down the 1/4 on slicks and on all-season tires on the street.

So Moser or Superior axles are pretty much the same?

The rear cover I was interested in the Ford Racing, LPW and Shelby versions, but I don't know which is better. I've heard of people having trouble with some aftermarket covers leaking, but that seems like it's more of an installation problem.

And Simon1...where did you purchase your Eaton upgraded rear from?

Originally Posted by Simon1

He's not going to be making 700-800 with that blower. But if he switches blowers and does, I would suggest bigger and aftermarket axles.

So what is the max power the Whipple I have will put out on a built motor?


It's a Detroit locker. DOn't remember whereI got. Been a few years. If you have an auto tranny, I would consider it, but with the manual tranny, ti horrible on the street. Clunks, clanks, bangs and shutters in parking lots. Screws up cornering when driving spirited.

At the drag strip and in a straight line the car hooks pretty good though.

Get the gear driven LSD from Auburn instead. They are noisy but should hold the power you need.