Rear gear size

charliemopps24 · May 30th, 2006, 03:52 PM

What size is the rear gears on an 89 LX 5.0? 8.8 or 9" or, i shudder to think, a 7.5?

mdvaldosta · May 30th, 2006, 04:39 PM

It's 8.8 - the 7.5's were used in 4 bangers Mustangs and pre '86 5.0's. 9" rears weren't ever put in the fox body platform (79-04) Mustangs, but can be swapped in with some finesse (although practically never needed).

1slo5.0 · May 30th, 2006, 05:51 PM

Yep, what mdvaldosta said.

Bossman351 · May 30th, 2006, 07:24 PM

I helped a friend swap a 9" into and 84 lx and it was fairly easy. the part that requires the most finess is welding the brackets the the housing and getting the angles all right.

1slo5.0 · May 30th, 2006, 07:41 PM

There are so many companies that make bolt in 9" housings and assemblies now it really isn't worth the hassle to fabricate one that will work anymore. A 9" really isn't necessary until you are making over 1000 hp.

May 30th, 2006, 03:52 PM	#1
charliemopps24 Newbie Join Date: May 2006 Location: Christiana, PA Posts: 6 iTrader: 0 reviews	Rear gear size What size is the rear gears on an 89 LX 5.0? 8.8 or 9" or, i shudder to think, a 7.5?

May 30th, 2006, 05:51 PM	#3
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	Yep, what mdvaldosta said. __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

May 30th, 2006, 07:24 PM	#4
Bossman351 Hardcore Enthusiast Join Date: Aug 2005 Location: On the trailer.......broke. Posts: 1,258 iTrader: 0 reviews	I helped a friend swap a 9" into and 84 lx and it was fairly easy. the part that requires the most finess is welding the brackets the the housing and getting the angles all right. __________________

May 30th, 2006, 07:41 PM	#5
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	There are so many companies that make bolt in 9" housings and assemblies now it really isn't worth the hassle to fabricate one that will work anymore. A 9" really isn't necessary until you are making over 1000 hp. __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

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May 30th, 2006, 04:39 PM	#2
mdvaldosta MM Fanatic 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,940 iTrader: 0 reviews	It's 8.8 - the 7.5's were used in 4 bangers Mustangs and pre '86 5.0's. 9" rears weren't ever put in the fox body platform (79-04) Mustangs, but can be swapped in with some finesse (although practically never needed).

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