4g61t.org

i've been planning a rwd project and i was curious to know if the 4bolt could stand up to some good power by itself? i have access to a 8.8 ford. a 9 inch ford and i have a 3 bolt with access to the 4 bolt swap components. the only reason i ask is i would prefer an independant rear as apposed the the solid rear.
i know there are various other strong rears out there but i want to work with what i got.
what do you think?

How far has it gone in a DSM? However far that may be, is could go further in a Colt. There is less stress on the drive train from weight loss. Thats my .02$ I'm on a 3 bolt right now. i've launched 14 times in a row with a welded center diff. Still holding up fine.

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http://home.tiora.net/davidc/Racing/Bar ... davesz.jpg

i would guesstimate around 500 to 700 hp with a rear built by shep.

his car is around 1400hp and its moving about the same weight.

i would go with a ford 8.8"

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If speed kills, then i shoulda been dead awhile ago. There is no such thing as "Too Much Power". There is no excuse for a lost race. Do you view the rev limiter as a fun limiter?or as a shift point? And we all know, more boost=more fun.

It completely depends; 100%, on your driving style. If you drive like an idiot and side-step your car on every launch it might not last nearly as long as someone who slips their car off the line. 4-bolts are significantly stronger than 3-bolts, and tend not to break at all in DSM's (unless you're Shep), so in a Colt I'd imagine it would be even more difficult to break one.

Going with a Ford rear-end is stupid, unless you have a dedicated drag car that is gonna be making over 900whp or something, and at that point I have to assume that you're competing with the car, in which case most classes say you need to run a Mitsubishi differential in the car.

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91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD

http://www.facebook.com/captaintonus

i would like to remind you guys that the plan is front engine rear wheel drive so the diff would have to hold up by itself. not sharing load with the front. just in case you didnt catch that.

Fwiw, shep runs a ford rear end now. I would go with and 8.8 in a rwd colt.

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John
89 Colt GT(2)
88 d50 4g63t, crower 272's, dsmlink

Yeah, very strong chance you will kill a 4 bolt in a RWD. Go with the 8.8. There is a member here with a ford rear in there colt.

I heard he ditched that rear end and went with something else, but rumors fly around about his car like crazy.

I didn't realize this was for a RWD project. I wouldn't want to use a rear-end that was only designed to take about 30% of the power going to it in a RWD application.

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91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD

http://www.facebook.com/captaintonus

A Ford 7.5 is perfectly adequate too... but the 8.8 is supposedly (from Ford) 35% stronger than the 7.5. It all depends on how much power you want to make or plan to make.

You could also consider using a Toyota 8" from the 86-95 range w/o the electric locker. Its a lighter, more compact, and easily as strong as the 8.8's. They are extremely easy to find and have a huge aftermarket with the 4x4 crowd. I've personally never seen one break and a couple guys in my 4Runner group had 4.3L and 350 sb pushing big power and huge tires. If they can take that kind of abuse...you won't break it.

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Turning a 4g61t into 1595 cc's of FURY!
10.995 @ 134.44 - http://www.youtube.com/watch?v=bZXvcvzuWGQ

SOLD to the fastest shifting hermaphrodite in CO

Supposedly the pinion size on the 8.8 is the same size as the Dana 60.

Since you have a, 8.8 ford already, use that. Ford 8.8s are all over the place. All the RWD Ford, lincoln, Mercury vehicles you can rape for parts. If you DID decide to go with a Ford 7.5, they're all over the place too. It's the same as a GM 7.5 (but different spline count, I think).

Are you wanting to lower the car? If so, a smaller ring gear will give you a little more clearance.

a ford 9inch is the "strongest" diff on the market, but that lack one thing, a suppot bearing on the pinion snout.

the ford 8.8 is almost as big as the 9, has a pinion snout and has the same size pinion shaft as the dana 60, its just not near as easy to set up as the 9".

go with the 8.8, weld a couple of brackets on, make some ladder bars, and a panhard rod mount and be done with it.

oh, and there are BILLIONS of the in yards everywhere.

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If speed kills, then i shoulda been dead awhile ago. There is no such thing as "Too Much Power". There is no excuse for a lost race. Do you view the rev limiter as a fun limiter?or as a shift point? And we all know, more boost=more fun.

Shep never ran a ford 8.8 in his car. He even said it was a custom chrysler axle setup on tuners (though I suppose he could have just said that to keep it a secret)

If you are doing a rwd only colt then I would assume you have a lot of fab experience and you might want to do a 4 link setup with a solid rear axle setup.

yeah i've been known to grind some metal and light my clothes on fire from welding, my dad is a mechanical engineer so i've been doomed with the hotrod bug since day one, i never had a chance really.
i was also eyeballing the IRS from a turbo II rx7 and the MKIII supra.. i'll probably go with the ford 8.8 though, my dad put one in his 302 powered 34 ford and it looks very simple to setup. the only thing i was trying to avoid is 1 breakage and 2 having the "rake" look like this v8 swapped aspire..

A V8 Assfire?