Rear end identification question

jerrys84 · 02-26-2002, 11:35 AM

2 years ago i bought an 84 mustang 'GT' (?), after considering a 3:73 gear change, I looked in the summit catalog and it appears i have a 7.5".

I thought the GT's had an 8.8"..

could someone please enlighten me.

I also noticed, when i pulled the tranny last summer, the hole in the floor for the 5 spd shifter was cut in my someone who is not very good at cutting metal..

I am starting to think my car isn't a GT??

Ponycar_302 · 02-26-2002, 02:00 PM

What does your title say? Your title should tell you whether it's a GT or LX. You can also run your vin # at: http://www.mustangworks.com/articles...n/351swap.html and see what it says. I don't know about the cutting. Perhaps you have to cut a little to make a 5 speed work in lieu of an automatic. It may have originally been an automatic. If your car is a GT it should have an 8.8 rearend. The 7.5 was used in LX's until 85. From 86 and up all Mustangs were equipted with 8.8's.

7000rpmisheaven · 02-26-2002, 02:42 PM

GT's didn't have 8.8's until 86 either. I've got a 5spd 85 GT and I unfortunately have 7.5 rear. I heard this trick on how to tell the difference between the 7.5 and 8.8. Go to the back of the car and look at the differential. If it is taller than it is wide it is an 8.8. If it is wider than it is tall it is a 7.5. I was lucky enough to find a friend that gave me a deal on a rear end he decided not to use. But you can get an FMS 8.8 with 3.73 gears installed for 699 from mustangs unlimited. This is what would have gotten myself. Considering 3.73 gears are about 400 installed, its not a bad price.

bosco · 02-26-2002, 03:41 PM

is there any way to tell what year car the rear end is from?

02-26-2002, 11:35 AM	#1
jerrys84 Registered Member Join Date: Feb 2002 Location: minnesota Posts: 129	Rear end identification question 2 years ago i bought an 84 mustang 'GT' (?), after considering a 3:73 gear change, I looked in the summit catalog and it appears i have a 7.5". I thought the GT's had an 8.8".. could someone please enlighten me. I also noticed, when i pulled the tranny last summer, the hole in the floor for the 5 spd shifter was cut in my someone who is not very good at cutting metal.. I am starting to think my car isn't a GT??

02-26-2002, 02:00 PM	#2
Ponycar_302 Registered Member Join Date: Feb 2002 Location: Pennsylvania Posts: 120	What does your title say? Your title should tell you whether it's a GT or LX. You can also run your vin # at: http://www.mustangworks.com/articles...n/351swap.html and see what it says. I don't know about the cutting. Perhaps you have to cut a little to make a 5 speed work in lieu of an automatic. It may have originally been an automatic. If your car is a GT it should have an 8.8 rearend. The 7.5 was used in LX's until 85. From 86 and up all Mustangs were equipted with 8.8's. __________________ I'm sofa king we tall did.

02-26-2002, 02:42 PM	#3
7000rpmisheaven Registered Member Join Date: Nov 2001 Location: germantown MD Posts: 283	GT's didn't have 8.8's until 86 either. I've got a 5spd 85 GT and I unfortunately have 7.5 rear. I heard this trick on how to tell the difference between the 7.5 and 8.8. Go to the back of the car and look at the differential. If it is taller than it is wide it is an 8.8. If it is wider than it is tall it is a 7.5. I was lucky enough to find a friend that gave me a deal on a rear end he decided not to use. But you can get an FMS 8.8 with 3.73 gears installed for 699 from mustangs unlimited. This is what would have gotten myself. Considering 3.73 gears are about 400 installed, its not a bad price. __________________ 85 GT 4bbl roller cam 2 ch. Flowmasters, O/R H-pipe Performer intake and carb milodon water pump, FMS 9mm wires, aluminum driveshaft, king cobra clutch

02-26-2002, 03:41 PM	#4
bosco Registered Member Join Date: Nov 2001 Location: austin TX Posts: 115	is there any way to tell what year car the rear end is from? __________________ '87 coupe, 308, world product windsor jr. heads, comp cams 220@.050/.512 @110 deg., roller cam,crane full roller rockers, 4bbl 600cfm holly carb,1 inch spacer, wiend aluminum intake, pullies, msd distributer/ignition, 1 5/8 bbk shorties, off road h-pipe 2 chamber flows, 3.73 posi rear end, P.S.T control arms, steeda tri-ax shifter, t-5, auto meter guages, and more to come (hopefully )

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