Does anyone know if there are any differences in the body of an 89 and a 91 fox? Both are hatchback, 5 speed, v-8's.

I understand the fenders are different, but is there anything that would prevent a complete parts swap including upgrading to 91+ fenders?

 

Nothing that i can think of.

 

I read somewhere that the K-member is a slight bit different, no problem because mine is going in. I also read that the 87-90 bodies were almost an inch wider? Maybe this was just the wheel to wheel width because of the different k-member.

These were not reliable sources of information, but can anyone shine some light on this if it is true?

 

Did a little digging and this is the only thing i could find. Other than what ive posted below the addition of the SRS safety system is the only big changes found. The wheel base,height, width and over all length are all the same as well as the weights being very close too.

This is from the Motorbooks Mustang buyers guide 1979-04

"Ford improved the Mustangs handling and tire wear characteristics in 1990 with a revision to the front suspension geometry, whereby the tops of the struts were moved slightly in the direction of the car's windshield to increase caster."

Nothing said about a new K member being used between the years. Hope this helps you out.

 

Hmm, does this mean the strut towers are slightly different? Or just different caster/camber plates? This would also require something done to the lower control arms to keep the ball joint in line with the strut and spindle?

 

From a mechanics stand point I see it as they either moved where the strut holes were stamped at on the tower or better caster camber plates, not cost effective to make such a big change like moving the tower when you can just move the hole and have the same result for cheaper. Nothing would have to be done to the lower control are since the caster is determined by the movement of the top of the strut on the Mustang.