Rear ends..limited slip 7.5? Or 8.8?? - Mustang Evolution

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Old 05-15-2014, 12:24 PM   #1
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Rear ends..limited slip 7.5? Or 8.8??

I am swapping my v6 to a 2v 4.6. Should I keep my 7.5 and upgrade it or just go get the 8.8???

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Old 05-15-2014, 12:39 PM   #2
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Upgrading the 7.5 is a complete and total waste of money. Leave it alone until it blows or just do the 8.8 now.
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Old 05-15-2014, 12:42 PM   #3
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Ok..well I'll probably just weld the spider gears in the 7.5 for now...but when I do swap..what's your opinion gt 8.8? Or a cobra IRS 8.8

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Old 05-15-2014, 12:45 PM   #4
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What do you want to do with the car? Unless you are serious about road racing and autocross just put in the solid axle, the IRS weighs more and experiences some nasty wheel hop unless you upgrade it initially. And I wouldn't even bother with the welding spider gears for now. Just swap in an 8.8 solid axle, 31 spline axles with a Torsen differential and the gear of your choice, and be done with it. Do it once, do it right.
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Old 05-15-2014, 12:48 PM   #5
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Well its gonna be a daily driver, but I'm definitely going to give it hell often. I don't know too much about the IRS..haven't read into it really...

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Old 05-15-2014, 12:50 PM   #6
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And I've also heard the 7.5 is better if you make it posi..spins over faster and weighs less

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Old 05-15-2014, 12:51 PM   #7
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Well the IRS weighs a considerable amount more than a solid axle from a GT, and unless you autocross a lot like I do you won't need it. If you like to launch your car a lot and drag race then keep the solid axle.

And in no way is a 7.5 better, its far far weaker and is so easy to break with stock GT power and decent tires.
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Old 05-15-2014, 12:55 PM   #8
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Ok..well what would be some good upgrades for the 8.8?

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Old 05-15-2014, 01:01 PM   #9
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Weld the axle tubes, 31 spline diff, 31 spline axles. Tubular lower control arms, subframe connectors on the chassis. Torque arm and panhard bar setup from Max Motorsports.

This is the pretty standard street/strip recipe for a stout solid rear axle. Its not cheap either and ACTUALLY by the time you get done with the torque arm/panhard setup plus the SRA its really not much lighter than the IRS. The problem with the IRS is that you pretty much NEED to upgrade it with a $700 bushing kit right off the bat for it to be serviceable. And it still won't launch as good as a SRA but if you just street drive it or like going around corners it is better.
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Old 05-15-2014, 01:03 PM   #10
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When you want to swap in the 8.8 i would just pull the entire axle off of a GT of the same generation (94-98 or 99-04) and then before it even goes in just upgrade everything to 31 spline, just so you don't have to go through the trouble later. Then some good mods for the rear end are some Rear Lower Control Arms, and depending how far you want to go, Subframe connectors, with a Panhard Bar and Torque Arm set up. All of that with some sticky tires and your launches will be amazing. But you said its your daily driver car so it all depends on how far you want to go with it. I've got a decent amount of suspension work and mine is my daily driver.
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Old 05-15-2014, 01:07 PM   #11
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Right. Well I really appreciate the info..I'll be on the look out for an 8.8 haha

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Old 05-15-2014, 01:12 PM   #12
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Like he said, make sure you get one for your year. The 99-04 rears are about an inch wider than the 96-98 ones are.
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Old 05-15-2014, 01:24 PM   #13
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I'd just like to place this here

My IRS is definitely heavier than my SRA, it took four guys to lift the IRS onto a tranny jack vs. two for the SRA. I don't get any wheel hop until I try doing a burnout at the drag strip. If you want a slightly smoother ride (depending on the ride height you want) then I would go IRS all the way
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Old 05-15-2014, 01:27 PM   #14
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I want it to have BADASS stance...not really inclined in that category though so I really don't know what I need for the height..would need pics to pick from haha

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Old 05-15-2014, 01:32 PM   #15
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Quote:
Originally Posted by Mile high JDF View Post
I'd just like to place this here

My IRS is definitely heavier than my SRA, it took four guys to lift the IRS onto a tranny jack vs. two for the SRA. I don't get any wheel hop until I try doing a burnout at the drag strip. If you want a slightly smoother ride (depending on the ride height you want) then I would go IRS all the way

What I am saying is that once you add up the weight of the IRS vs the SRA/Torque Arm/Panhard bar setup all combined its not as far off as you'd think. The IRS puts it all in once place whereas the SRA setups spread it out a bit.
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Old 05-15-2014, 01:42 PM   #16
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What I am saying is that once you add up the weight of the IRS vs the SRA/Torque Arm/Panhard bar setup all combined its not as far off as you'd think. The IRS puts it all in once place whereas the SRA setups spread it out a bit.

My Panhard Bar and Torque arm weren't really that heavy. I bet it's still a fair bit lighter.
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Old 05-15-2014, 01:45 PM   #17
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My Panhard Bar and Torque arm weren't really that heavy. I bet it's still a fair bit lighter.
It is, just not 100+lbs like ppl will lead you to believe. Its still substantial though. For straight line setup the MM tq arm/panhard setup is optimal and the lightest front setup... I hate to say... is from Unauthorized Product Reproductions.
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Old 05-15-2014, 03:03 PM   #18
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What I am saying is that once you add up the weight of the IRS vs the SRA/Torque Arm/Panhard bar setup all combined its not as far off as you'd think. The IRS puts it all in once place whereas the SRA setups spread it out a bit.
Ah yes that makes sense. I just think of it in control arms and SRA only, I never factor in how much a TA and Panhard bar would weight
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Old 05-15-2014, 03:05 PM   #19
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I want it to have BADASS stance...not really inclined in that category though so I really don't know what I need for the height..would need pics to pick from haha

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We definitely have a lot of picture threads that will give you a good idea. My car is lowered 2.5" front and 2" rear and I would honestly like to go lower (or get bigger wheels) but some people don't like that look
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Old 05-15-2014, 04:45 PM   #20
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Post a pic of yours and send me in the direction of the others haha

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Old 05-15-2014, 05:53 PM   #21
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Link to more Post up some pics of your 96-04 Mustang!
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Old 05-15-2014, 06:38 PM   #22
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That's a nice stance. What all do you have?

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Old 05-15-2014, 07:47 PM   #23
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That's a nice stance. What all do you have?

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To get it that low it's just cut stock Cobra springs
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Old 05-15-2014, 07:55 PM   #24
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Does it still ride pretty good? And what size are your tires and rims?

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Old 05-15-2014, 09:09 PM   #25
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Does it still ride pretty good? And what size are your tires and rims?

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Nope, it rides pretty harsh, but it handles great. I'm running 17x9 and 17X10.5 with 255/40R17s and 315/35R17s
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Old 05-15-2014, 11:46 PM   #26
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Are you rubbing any in the back?

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Old 05-16-2014, 12:02 AM   #27
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Are you rubbing any in the back?

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I rub slightly on the passenger side rear, but not enough to cut the tre. I plan on rolling my fenders eventually
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Old 05-16-2014, 12:05 AM   #28
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Have you thought about a wider body?

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Old 05-16-2014, 12:06 AM   #29
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Rear ends..limited slip 7.5? Or 8.8??

@napalm_inc has some pretty cool stuff coming along
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Old 05-16-2014, 12:08 AM   #30
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I'm notice of a fan of that look, on a race car sure but not a street car.
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Old 05-16-2014, 12:08 AM   #31
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Those are 12" or 13" wide in the back I believe. Click image for larger version

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Old 05-16-2014, 12:12 AM   #32
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That is awesome. I'm a big fan of a widebody if its done right. Do you know around how much it would cost to get it done?

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