203F SL0888 8K17

There were many different options for the gears. There should be a tag on one of the rearend bolts

GM RPO Axle Code List GM Axle Gear Ratio Lookup

GM RPO Codes Axle Ratio Identification

Underneath the car, next to the fuel tank, and above the drive axle.

It is on a tag on the keyless entry module.

The fuel filter is located in the rear of the vehicle forward of the fuel tank above the rear axle mounted to the body of the car.

don't have 89, but for 96 it means 6250 lbs capacity, 3.55 axle ratio.

It's in the front of the shop manual for your truck.

above the rear axle mounted to the floor pan.....dumb place....GL

Hi there should be a tag on the rear diff housing ,, one of the bolts that hold the rear cover on. all the info will be on the tag.

No tag on door pillar or door telling you? Or try ( www.decodethis.com )

AS MUSTANG DOES NOT OFF THIS it would be very expensive and almost inpossible you wiould have to fit a front differential fabricate spindles and axle shafts install a transfer case and redo floor pan to accept all these pieces.