7.5" to 8.8" rear end swap help...

NELLY97Cobra · September 21st, 2008, 10:30 AM

Hey everyone, I have a 97 mustang V6 that Im working on and needed to know if the fox body rear end will bolt up to the sn95 and if my axles and brake system will fit. I really dont want to spend too much on getting a 5 lug conversion kit for it so I was hoping the axles i have on the 7.5" fit the 8.8". Thanks in advance!

demonicus · September 21st, 2008, 11:21 AM

should have bought a complete 8.8 and sold the 7.5
I dont think they'll work.

fairlane_68 · September 21st, 2008, 03:57 PM

The Fox 8.8 is narrower by 1.5 inches. You'd be better off with a 8.8 out of another SN95...they're a dime a dozen. Or you can either run wider wheels with an offset, or look like a cornball with a funky rear end.

NELLY97Cobra · September 21st, 2008, 07:14 PM

Thats exactly what I wanted to do but I got a good deal on a T5 tranny and rear end from a Fox. I dont mind running wider wheels with a different offset. Thats one of the last things Im doing and I want them to look nice along with the paint. But I was wondering if the axles that I already have fit the 8.8" so I can just swap everything to the new diff.

fogged306 · September 21st, 2008, 08:01 PM

I could be wrong here too, but I think the trans is different between the fox and the sn95. I believe the input shaft is longer on the sn95 trans... e3sean?

fairlane_68 · September 21st, 2008, 10:25 PM

Originally Posted by NELLY97Cobra

Thats exactly what I wanted to do but I got a good deal on a T5 tranny and rear end from a Fox. I dont mind running wider wheels with a different offset. Thats one of the last things Im doing and I want them to look nice along with the paint. But I was wondering if the axles that I already have fit the 8.8" so I can just swap everything to the new diff.

No. Your 7.5 axles will be too long, and I believe the spline count will be different. I think the 7.5 is a 28-spline, and the 8.8 is a 31. I could be thinking of the truck 8.8, which I know is a 31-spline.

jtyson8602 · September 21st, 2008, 11:48 PM

axles should be the same spline count but too long i think

trueblue01 · September 22nd, 2008, 06:45 AM

Input shaft IS longer on SN95s

1slo5.0 · September 22nd, 2008, 12:19 PM

Originally Posted by NELLY97Cobra

Thats exactly what I wanted to do but I got a good deal on a T5 tranny and rear end from a Fox. I dont mind running wider wheels with a different offset. Thats one of the last things Im doing and I want them to look nice along with the paint. But I was wondering if the axles that I already have fit the 8.8" so I can just swap everything to the new diff.

Won't work for your car.

1slo5.0 · September 22nd, 2008, 12:20 PM

Originally Posted by fairlane_68

No. Your 7.5 axles will be too long, and I believe the spline count will be different. I think the 7.5 is a 28-spline, and the 8.8 is a 31. I could be thinking of the truck 8.8, which I know is a 31-spline.

Standard Mustang 7.5 and 8.8 rear ends are 28 spline.

NELLY97Cobra · September 23rd, 2008, 08:09 AM

Thanks guys, I found a diff from a 95 Cobra so I dont have to go through the headache. I got it from a local junkyard for $350

September 21st, 2008, 10:30 AM	#1
NELLY97Cobra Newbie Join Date: Jun 2008 Posts: 16 iTrader: 0 reviews	7.5" to 8.8" rear end swap help... Hey everyone, I have a 97 mustang V6 that Im working on and needed to know if the fox body rear end will bolt up to the sn95 and if my axles and brake system will fit. I really dont want to spend too much on getting a 5 lug conversion kit for it so I was hoping the axles i have on the 7.5" fit the 8.8". Thanks in advance!

September 21st, 2008, 11:21 AM	#2
demonicus Regular 1988 mustang LX coupe Join Date: Jul 2007 Location: Maple Ridge, BC, Canada Posts: 137 iTrader: 0 reviews	should have bought a complete 8.8 and sold the 7.5 I dont think they'll work. __________________ 89GTcoupe- 304ci, tfs1cam, tftw heads, 2.5"flowies, GT40intake, TF23lb inj, t5 w CFDF, SN5bolt, 3.73gears, GTkit, Y2K R wing, 17" Tribars 88coupe- lookin for a new powerplant

September 22nd, 2008, 06:45 AM	#8
trueblue01 Enthusiast 1989 Mustang LX 10.98@126.7 NA Join Date: Feb 2008 Location: N.E. Ohio Posts: 698 iTrader: 0 reviews	Input shaft IS longer on SN95s __________________ Never fast enough.

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September 21st, 2008, 03:57 PM	#3
fairlane_68 Regular Join Date: Aug 2008 Posts: 404 Blog Entries: 5 iTrader: 0 reviews	The Fox 8.8 is narrower by 1.5 inches. You'd be better off with a 8.8 out of another SN95...they're a dime a dozen. Or you can either run wider wheels with an offset, or look like a cornball with a funky rear end.

September 21st, 2008, 07:14 PM	#4
NELLY97Cobra Newbie Join Date: Jun 2008 Posts: 16 iTrader: 0 reviews	Thats exactly what I wanted to do but I got a good deal on a T5 tranny and rear end from a Fox. I dont mind running wider wheels with a different offset. Thats one of the last things Im doing and I want them to look nice along with the paint. But I was wondering if the axles that I already have fit the 8.8" so I can just swap everything to the new diff.

September 21st, 2008, 08:01 PM	#5
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	I could be wrong here too, but I think the trans is different between the fox and the sn95. I believe the input shaft is longer on the sn95 trans... e3sean?

September 21st, 2008, 11:48 PM	#7
jtyson8602 Regular 1986 LX none yet Join Date: Jun 2008 Location: Albuquerque New Mexico Posts: 277 iTrader: 0 reviews	axles should be the same spline count but too long i think

September 23rd, 2008, 08:09 AM	#11
NELLY97Cobra Newbie Join Date: Jun 2008 Posts: 16 iTrader: 0 reviews	Thanks guys, I found a diff from a 95 Cobra so I dont have to go through the headache. I got it from a local junkyard for $350

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