Im in the process of swapping my 8.8 for a 9.75. The 9.75 i picked up has a bent axle shaft, but the rest looks good. So i went to a junk yard to get a new axle shaft and it was much larger an heavier. Then the junk yard proceded to tell me there are several configureations of the 9.75. I was unaware of this.

I personally think they screwed up in giving me the wrong axle shaft.

Any input on different 9.75 axles?

 

--------From a 4 x 4 magazine-----

The 9.75 has had a few changes in its relatively short life, including larger axle bearings and shafts in '99 (from a 1.620-inch inner diameter to 1.705 inches), a larger outer pinion bearing (increased from 1.31 x 2.68 inches to 1.31 x 3.00 inches), and the pinion was altered for a longer crush sleeve.

With the new-generation F-150s outnumbering everything but corner convenience stores, we thought it useful to look at this axle from a builder's/swapper's perspective and see what can be done to make it better. To that end, we enlisted the aid of the University of Northwestern Ohio's High Performance Drivetrains class to install just about every goodie currently available for the 9.75. This school is located in Lima, Ohio, and has a high-performance motorsports program beyond compare.