God I feel stupid...

vita · August 18th, 2010, 12:34 PM

I REALLY dont want to ask this, but I just dont know enough to search correctly for them...

whats the difference between the 7.5 and 8.8 rear ends? what stangs have what?

zinc-vert02 · August 18th, 2010, 12:39 PM

3.8l= 7.5 and gt,mach one, bullet ect= 8.8

AzSonicSnake · August 18th, 2010, 12:42 PM

7.5= weaksauce and in v-6 stangs and 4 bangers in the fox chassis.

8.8= gt and cobra/mach 1/bullitt rear end.

ReverendDexter · August 18th, 2010, 12:54 PM

The difference is the diameter of the ring gear inside the differential. The numbers (7.5, 8.8) are the diameter in inches. All else being equal, a larger gear is stronger.

All V8 Mustangs since the mid-80s have 8.8s; 4-cylinders and V6s have the 7.5. As of next year, all new Mustangs will come with the 8.8.

Most 8.8s are stock with a LSD (all 8.8s in Mustangs are), most 7.5s are open.

There ARE some advantages to running the smaller differential. The biggest is that it's lighter, which means less parasitic loss through the drivetrain. The 7.5 is still good to more power than most people give it credit for, it's only real disadvantage is that it's an open diff, and it's usually cheaper to replace the whole axle than it is to install an LSD in the 7.5. 8.8s also has a much larger aftermarket.

tweeters97 · August 18th, 2010, 09:12 PM

Originally Posted by ReverendDexter

The difference is the diameter of the ring gear inside the differential. The numbers (7.5, 8.8) are the diameter in inches. All else being equal, a larger gear is stronger.

All V8 Mustangs since the mid-80s have 8.8s; 4-cylinders and V6s have the 7.5. As of next year, all new Mustangs will come with the 8.8.

Most 8.8s are stock with a LSD (all 8.8s in Mustangs are), most 7.5s are open.

There ARE some advantages to running the smaller differential. The biggest is that it's lighter, which means less parasitic loss through the drivetrain. The 7.5 is still good to more power than most people give it credit for, it's only real disadvantage is that it's an open diff, and it's usually cheaper to replace the whole axle than it is to install an LSD in the 7.5. 8.8s also has a much larger aftermarket.

Nuff said!!! Amen Rev

August 18th, 2010, 12:39 PM	#2
zinc-vert02 Bringing Yellow Back 2002 mustang gt 12.2 at 117 Join Date: Apr 2010 Location: WISCONSIN Posts: 9,963 iTrader: 1 reviews	3.8l= 7.5 and gt,mach one, bullet ect= 8.8 __________________ SOON TO BE 5.4 3V POWERD WITH A ROUSH CHARGER HELPING IT BAMA Performance Drag Team Member #4

August 18th, 2010, 12:42 PM	#3
AzSonicSnake 2009 ROTY 2003 SVT Cobra 11.07@127 Join Date: Aug 2008 Location: North Phoenix,AZ Posts: 5,640 iTrader: 1 reviews	7.5= weaksauce and in v-6 stangs and 4 bangers in the fox chassis. 8.8= gt and cobra/mach 1/bullitt rear end. __________________ MM Cobra Club #25 My Autolog Profile

August 18th, 2010, 12:54 PM	#4
ReverendDexter Priest of the Car Gods Clapped-out '90 GT 'vert ~5.5 seconds off TTOD :( Join Date: Jan 2007 Location: Rohnert Park, CA Posts: 13,808 iTrader: 0 reviews	The difference is the diameter of the ring gear inside the differential. The numbers (7.5, 8.8) are the diameter in inches. All else being equal, a larger gear is stronger. All V8 Mustangs since the mid-80s have 8.8s; 4-cylinders and V6s have the 7.5. As of next year, all new Mustangs will come with the 8.8. Most 8.8s are stock with a LSD (all 8.8s in Mustangs are), most 7.5s are open. There ARE some advantages to running the smaller differential. The biggest is that it's lighter, which means less parasitic loss through the drivetrain. The 7.5 is still good to more power than most people give it credit for, it's only real disadvantage is that it's an open diff, and it's usually cheaper to replace the whole axle than it is to install an LSD in the 7.5. 8.8s also has a much larger aftermarket. __________________ O o /¯/______________________ \|BLAAAAAAAAAAAAAAAAAAAAAAAAARGH!!! \_\ Last edited by ReverendDexter; August 18th, 2010 at 01:01 PM.

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