Big Numbers, what rearend?

[dover]

Finally about done with the car and doing final touches. Question for all you SRA guys.

Currently I have an 01 Bullit 8.8 on the car. My plans are:
Moser 31
Detroit Locker
UPR Upper/Lower CA's
Girdle
3.55's

Car is a 6 Speed, made 717 prior with an IRS an stock clutch!, just switched over this year to the SRA. I have had people tell me to forget about the locker an go with a spool? The car will only be a weekend/nice weather car. Hell it only has 18K on it right now, bought it with 12k in 06!

And no I don't want to do a 9'' epper:

Thanks for all the help guys. I think I have asked a million questions on here and by far the turbo cobra guys are the best at getting back with detailed responses. :dancenana:

 

[rotor_powerd]

If its going to be driven on the street (Sounds like that's all you're building it for), don't do a spool unless you want to chew up tires and break shit.

For a little more strength, you could go 33 spline, but what you have planned sounds fine to me unless you're doing 6K clutch dumps on slicks form every light.

EDIT - Saw you have a locker listed. It will be locking/unlocking going around turns and be a pain in the ass..... just run a posi unit.

 

[SIr RicCuS]

A locker will be far less comfortable when driving on the street (especially turning) versus the alternative. I've got a 31 spline Eaton Posi Differential and it's treated me great so far with the previous Whipple setup. I know a handful of people with this identical setup that have gone deep in the 9's without issues.

The stock clutch is going to be toast really fast though. LOL

Go with a twin-disk when you upgrade. Can't beat it.

 

[Digital]

Don't go with locker. 31 spline axles are fine for 2 reasons, 1. they are cheaper then 33+ and can be found easily if you break one, 2. the diffs are cheaper and can be found easily if you break it.
Do not go with a locker, you will hate your weekend car. Go with a eaton diff if you wanna spend some money or get a 31 out of a gt500 or 03/04 cobra and re-shim the clutches.
Besides that all your other mods are great.
My setup is in my sig.

 

[Juiced46]

Keep the 31 spline axles but ditch the locker. Go with a Detroit Tru Trac. This diff can take a pounding and driveability is like stock. No locking/unlocking noisy rearend to worry about.

 

[HIPSI]

Keep the 31 spline axles but ditch the locker. Go with a Detroit Tru Trac. This diff can take a pounding and driveability is like stock. No locking/unlocking noisy rearend to worry about.

sorry but the tru tracs are not that strong i have personly broke 1 and my buddies n/a all stock motor with boltons has broken 2

 

[Juiced46]

sorry but the tru tracs are not that strong i have personly broke 1 and my buddies n/a all stock motor with boltons has broken 2

Was this the new or old design, when did these break? Ive been running my Tru Trac cutting 1.4 60s and its held up great. This was launching @ 6k on 28"ET Drags with the stick and a KB.

 

[HIPSI]

Was this the new or old design, when did these break? Ive been running my Tru Trac cutting 1.4 60s and its held up great. This was launching @ 6k on 28"ET Drags with the stick and a KB.

this was about 6 years ago so im not sure i know my buddy was launching @7800 0n 26/10 mt

 

[Juiced46]

this was about 6 years ago so im not sure i know my buddy was launching @7800 0n 26/10 mt

They have since changed the design because of breakage issues. The new design is MUCH better. I havent heard of any of the new style ones breaking.

 

[dover]

I will check out the Detroit Tru Trac, sounds ideal for me. I will occasionally hit the track (I'll also be running a 28'' tall tire) I'll probably be leaving off a launch master or something of the same concept.

 

[HIPSI]

They have since changed the design because of breakage issues. The new design is MUCH better. I havent heard of any of the new style ones breaking.

that is good to know

 

[y2k2gt]

I dont mind having a spool.

 

[2bscrewed]

They have since changed the design because of breakage issues. The new design is MUCH better. I havent heard of any of the new style ones breaking.

+1, I have been running them for 6 years now. First in my 10 sec Lighni9ng, and now in my Cobra. Best street strip diff you can buy. Back in the day they only had 2 worm gears and they were breaking, they then upgraded them to 3 work gears and better case bolts. No problems since.

I would def weld on a swarr bar to you 8.8 housing, or custom make a brace, to keep the axle tubes true to the center housing. I didn't on my first SRA, and trashed the whole thing. Couldn't even straighten it on the JIG.
This is what mine looks like now.

 

[C666]

31's and TruTrac is the perfect setup for you

http://www.svtperformance.com/forums/engine-drivetrain-256/659290-fs-built-sra.html#post9154454

 

[dover]

if i didnt already have an 8.8, i would have jumped on this, it'll be cheaper for me to just build mine.. thanks though

 

[NeverFastEngh]

33 spline pro race axles and a leight weight spool. When your going in a straight line you wont know the difference.

 

[DUMBASS]

i have a locker in mine it only jerks if you are making a real slow U style turn.