8.8 or 7.5?

Scrapla · 06-17-2002, 10:44 AM

I wanna order 3:73's but not sure if my rear end on my 90 GT 5spd is a 8.8 or 7.5 how can I tell?

RPM427 · 06-17-2002, 10:55 AM

Every GT comes with a 8.8, was your a conversion? or is it a real GT? If it is then its, of course, a 8.8.

By the way, 3.73's are great!

Dark_5.0 · 06-17-2002, 10:56 AM

Its an 8.8 rear end

Scrapla · 06-17-2002, 11:02 AM

someone just told me the 4lug's are 7.5, its a real GT I even looked up the car history sing the VIN#, thanks.

jerrys84 · 06-17-2002, 11:45 AM

not ALL gt's are 8.8 i don't think they changed them all to 8.8 till 86 or so?

i have an 84 with a 7.5..

if you go to summit online catalogue, they show gaskets of the rear diff bolt pattern..

the 7.5 is oval and the 8.8 is more round..

jerrys84 · 06-17-2002, 11:56 AM

whoops, read first answer question later....

on a 90 the guys were correct, 8.8"

RPM427 · 06-17-2002, 12:34 PM

Maybe I need to be more clear. ALL 87 - 93 Gt's have 8.8 axles in them.

Scrapla · 06-18-2002, 10:54 AM

Thanks for your help my gears should be here by the end of the week :-)

RPM427 · 06-18-2002, 10:57 AM

Are you installing them? If you are, do you know you need to check/set the backlash with a dail idicator and a few other important things? Just warining you if you didn't know.

Stroked408 · 06-18-2002, 07:29 PM

Not trying to get flamed or anything,but is the 86 GT the black sheep of the family?

The 1986 Mustang GT's were the first V8 Mustangs to get the 8.8 because of how much torque the new fuelie engine was making.

The 4 headlight cars are really starting to become hard to find.

06-17-2002, 10:44 AM	#1
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	8.8 or 7.5? I wanna order 3:73's but not sure if my rear end on my 90 GT 5spd is a 8.8 or 7.5 how can I tell?

06-17-2002, 10:55 AM	#2
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	Every GT comes with a 8.8, was your a conversion? or is it a real GT? If it is then its, of course, a 8.8. By the way, 3.73's are great! __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

06-17-2002, 10:56 AM	#3
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Its an 8.8 rear end __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

06-17-2002, 11:45 AM	#5
jerrys84 Registered Member Join Date: Feb 2002 Location: minnesota Posts: 129	not ALL gt's are 8.8 i don't think they changed them all to 8.8 till 86 or so? i have an 84 with a 7.5.. if you go to summit online catalogue, they show gaskets of the rear diff bolt pattern.. the 7.5 is oval and the 8.8 is more round.. __________________ 91 LX 'work in progress' previous stangs; lightly modded 84GT 81 2.3 converted to 302 auto

06-17-2002, 11:56 AM	#6
jerrys84 Registered Member Join Date: Feb 2002 Location: minnesota Posts: 129	whoops, read first answer question later.... on a 90 the guys were correct, 8.8" __________________ 91 LX 'work in progress' previous stangs; lightly modded 84GT 81 2.3 converted to 302 auto

06-17-2002, 11:02 AM	#4
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	someone just told me the 4lug's are 7.5, its a real GT I even looked up the car history sing the VIN#, thanks.

06-17-2002, 12:34 PM	#7
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	Maybe I need to be more clear. ALL 87 - 93 Gt's have 8.8 axles in them. __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

06-18-2002, 10:54 AM	#8
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	Thanks for your help my gears should be here by the end of the week :-)

06-18-2002, 10:57 AM	#9
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	Are you installing them? If you are, do you know you need to check/set the backlash with a dail idicator and a few other important things? Just warining you if you didn't know. __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

06-18-2002, 07:29 PM	#10
Stroked408 Registered Member Join Date: Jun 2002 Location: Southwest Posts: 131	Black Sheep Not trying to get flamed or anything,but is the 86 GT the black sheep of the family? The 1986 Mustang GT's were the first V8 Mustangs to get the 8.8 because of how much torque the new fuelie engine was making. The 4 headlight cars are really starting to become hard to find. __________________ Deeper,Harder,Faster Stage Deeper Launch Harder Go Faster