*Need Serious HELP* deciding what to do with my Rear End?

[HandsomeRob]

Hey guys,
I ripped out my rear differential today and just dropped it off at a local Performance Rear-End Shop. I need your expertise ASAP so I can order my parts if needed.

I decided since I pulled the diff completely out of the car, I mine as well powdercoat the entire axle housing for longevity.
I also wanted to have the axle tubes professionally pinned and welded together for future abuse.
The Quad Shock mounts are being cut and grinded down since I'm running a Torque Arm and Panhard Bar.
My current Diff has the following:
Superior 31 Spline Axles (Not sure if they are forged)
Eaton Posi
FRP 373 Gears
Ford Racing Girdle Diff Cover

My car will be making about 600-650rwhp. (Centrifugal Supercharger)
I'm running a T56 6-Speed with a 28" tall tire for now.
I have 2 sets of wheels. (15X10-17X4 Weldstars)&(17X10.5-17X9 FR500's) I plan on swapping them out from time to time depending on the type of driving i am doing.
It will probably only see the dragstrip once or twice in its lifetime. This is my weekend car and take it through the canyons and to the beach here and there.

My question is:
Should I change my gear ratio?
Should i change out my EATON Posi for a Detroit Locker, TrueTrac, or FRP Traction LOK LSD?
Should I change out my 31 Spline Superior axles for Forged Mosers?

I'm leaning towards installing 410 gears.
Thanks for any guidance guys.

 

[svtcobralover]

If you can swing it, I would get a set of Moser axles, and since you wont really be taking it to the strip I would just keep the Eaton in it. Honestly you don't really need to get new axles, but for longevity purposes it might not be a bad idea.

 

[HandsomeRob]

I hate to throw more money into the differential but since its out and apart is rather do it now than later. How good are Superior 31 spline axles? Mosers are like $300. ;-/

 

[98 Saleen Cobra]

You already know my vote.

Keep the Eaton
Keep the axles
Do 4.10's

 

[slow2v]

I hate to throw more money into the differential but since its out and apart is rather do it now than later. How good are Superior 31 spline axles? Mosers are like $300. ;-/

i highly doubt you will ever break them. i have friends with stock 28s that have ran 10s with 600hp that were fine

just be on slicks at the track and urll be good

 

[HandsomeRob]

Thanks for the replys. I think I'm just going to do what 98SaleenCobra said.
Eaton-Superior Axles-410's

 

[slow2v]

Thanks for the replys. I think I'm just going to do what 98SaleenCobra said.
Eaton-Superior Axles-410's

28 tall tire?
edit - nevermind...missed it

good luck and enjoy!

 

[98 Saleen Cobra]

28 tall tire?

He told me a 28'' tall tire for about 90% of the time.. 4.30's would be good too with that tall of a tire, but when he puts back on the 26" it'll be to much for a street car that sees canyons and possibly 0 track time in it's life.

 

[HandsomeRob]

Thanks. 456's are too much and FRP doesn't make 430's. 410's should be perfect.

 

[slow2v]

doesnt motive make 430s? i think thats too much for your setup tho
kind of depends on your goals tho. since your not going to the track you dont have to worry about hitting limiter in 4th

 

[HandsomeRob]

Motive does but I only want to use FRP.
410's will be perfect.

 

[slow2v]

Motive does but I only want to use FRP.
410's will be perfect.

i agree
its gonna be a monster :rockon:

 

[NVRL8TE]

Yup.

 

[IronSnake]

I would do a Torsen diff. Car's benefit so much from them it's crazy. 4.10 gear

 

[HandsomeRob]

I would do a Torsen diff. Car's benefit so much from them it's crazy. 4.10 gear

I looked at the Torsen diffs. I can't spend that much $$ on one. My Eaton should do me just fine. I might get a High Performance clutch kit for it. Not sure yet. Just ordered the 410 gears.

 

[Helomech74]

Wavetrac diff, 4.10 gears and Mark Williams axles. Pricey, but you won't ever need to worry about replacing them again.

 

[9804SNAKES]

hey guys not looking to hijack the thread but I saw no mention of FRPP 31 Spline Axles as a recommendation, only Moser and Superior. Am I to assume I went wrong with FRPP 31 Splines? Thanks in advance.

 

[THE RED 1]

Do the 4.10's and the true track my buddy has one in his lightning and zero noise handles beautiful and always spins both wheels when its WOT

 

[2DXTRM]

hey guys not looking to hijack the thread but I saw no mention of FRPP 31 Spline Axles as a recommendation, only Moser and Superior. Am I to assume I went wrong with FRPP 31 Splines? Thanks in advance.

Nothing wrong with the Ford Racing 31 spline axles.