Rear end size

MrClean · 08-28-2001, 09:37 AM

I have an 86 GT with AOD and am looking into 3:73 for it. How do I know what size the rear is?

95mustanggt · 08-28-2001, 09:50 AM

I think you're asking whether you have an 8.8", 7.5" or possibly a 9" rear end

I thought the 86 cars had the 8.8", but I'm not sure I know the 87 GT's+ did. The V6's had the 7.5".

Guess we'll have to have an expert come in on this one.

------------------
1995 Mustang GT

GTGeorge · 08-28-2001, 10:31 AM

8.8 rear has flat sides on the cover, the 7.5 rear has a round cover, the 9" is not found in the fox body unless someone has put it in, and it has a removable center section.

------------------
93GT 398" 14:1,1080 Barry Grant Carb, nitrous fogger, c-4, Street Heats, 2" RCI long tubes, more.
79 notch 306, 5speed, carb, small plate nitrous.
88 turbo coupe 5 speed stock
91GT conv. 5.0 5speed, 3.73, and the normal bolt on stuff, just added to herd a sweet 86,SVO,5speed,306,msd,650dp,bbk,autometer,ect.
91 f-150 4x4 tow truck

RUSTANG · 08-28-2001, 11:03 AM

I have a write up on the differences on my sight. www.flemworld.com. Look under How To's>>85 How To's and then "7.5 and 8.8 Differences"

Mike

shovelnose · 08-29-2001, 04:20 PM

If you look at the diff. pan the 7.5" will be wider than it is tall. A 8.8" will be taller than it is wide.

------------------
82 Mercury Capri 302, Comp. Cams, Tremec 3550, 3.73's, 12.8@106 N/A
Kevin's Capri
Kevin's Mustang

1BAD89 · 08-30-2001, 11:01 PM

1986 GT= 8.8 rear end.

------------------
1989 GT, 3:55's, full exhaust, 4 in. hood, Pro 5.0, Have many other parts 4 sale. All parts for sale now.

2000 Camaro SS-A4 =P

1989 Chevy S-10, EX. Cab-383(500+hp on motor), trick flow heads, trick flow pistons, etc... autometer phantom gauges, "built" 700R4, roll cage, lexan back window, corbeau seats, R.H.S. 5 harnesses, Fuel cell, convo pro wheels, 15x14's with 29x18.5 M/T'S on back, 15x4's on front, nitrous, and so much more!

http://www.geocities.com/i8urvpr/JM.html

08-28-2001, 09:37 AM	#1
MrClean Registered Member Join Date: Aug 2001 Location: Saratoga Springs Posts: 30	Rear end size I have an 86 GT with AOD and am looking into 3:73 for it. How do I know what size the rear is?

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08-28-2001, 09:50 AM	#2
95mustanggt Registered Member Join Date: May 2000 Location: Kamloops, BC Posts: 2,875	I think you're asking whether you have an 8.8", 7.5" or possibly a 9" rear end I thought the 86 cars had the 8.8", but I'm not sure I know the 87 GT's+ did. The V6's had the 7.5". Guess we'll have to have an expert come in on this one. ------------------ 1995 Mustang GT

08-28-2001, 10:31 AM	#3
GTGeorge Registered Member Join Date: Apr 2001 Location: Harrisburg,Pa Posts: 11	8.8 rear has flat sides on the cover, the 7.5 rear has a round cover, the 9" is not found in the fox body unless someone has put it in, and it has a removable center section. ------------------ 93GT 398" 14:1,1080 Barry Grant Carb, nitrous fogger, c-4, Street Heats, 2" RCI long tubes, more. 79 notch 306, 5speed, carb, small plate nitrous. 88 turbo coupe 5 speed stock 91GT conv. 5.0 5speed, 3.73, and the normal bolt on stuff, just added to herd a sweet 86,SVO,5speed,306,msd,650dp,bbk,autometer,ect. 91 f-150 4x4 tow truck

08-28-2001, 11:03 AM	#4
RUSTANG Registered Member Join Date: Jan 1999 Location: Dale City Va. Posts: 516	I have a write up on the differences on my sight. www.flemworld.com. Look under How To's>>85 How To's and then "7.5 and 8.8 Differences" Mike

08-29-2001, 04:20 PM	#5
shovelnose Registered Member Join Date: Oct 2000 Location: Ontario, Canada Posts: 234	If you look at the diff. pan the 7.5" will be wider than it is tall. A 8.8" will be taller than it is wide. ------------------ 82 Mercury Capri 302, Comp. Cams, Tremec 3550, 3.73's, 12.8@106 N/A Kevin's Capri Kevin's Mustang

08-30-2001, 11:01 PM	#6
1BAD89 Tubbed and Juiced Join Date: Mar 2001 Location: Tulsa, Oklahoma Posts: 1,861	1986 GT= 8.8 rear end. ------------------ 1989 GT, 3:55's, full exhaust, 4 in. hood, Pro 5.0, Have many other parts 4 sale. All parts for sale now. 2000 Camaro SS-A4 =P 1989 Chevy S-10, EX. Cab-383(500+hp on motor), trick flow heads, trick flow pistons, etc... autometer phantom gauges, "built" 700R4, roll cage, lexan back window, corbeau seats, R.H.S. 5 harnesses, Fuel cell, convo pro wheels, 15x14's with 29x18.5 M/T'S on back, 15x4's on front, nitrous, and so much more! http://www.geocities.com/i8urvpr/JM.html