rear axle question

Reply Subscribe

Thread Tools

Search this Thread

May 14, 2008 | 05:41 PM

Hillbilly_Deluxe

Thread Starter

Junior User

Joined: Mar 2007

Posts: 73

Likes: 0

rear axle question

I have a 99 f150 with a 8.8 non LS rear end and I was wondering if it would be possible to put in a LS rear end out of and older f150. I have a 94 with a 8.8 LS and same gear ratio that I'm no longer using. Would It be possible to swap the two? would I have to swap the whole center section or just the Internal components?

Thanks

May 14, 2008 | 05:49 PM

96f150

Fleet Mechanic

Joined: Nov 2000

Posts: 1,713

Likes: 2

From: In my House

I think it would be easier to swap the entire axle. Is your 99 have rear discs? Your 94 should have the ABS plug in the top of the pumpkin, so you should be all set there.
Rich

May 14, 2008 | 05:59 PM

Hillbilly_Deluxe

Thread Starter

Junior User

Joined: Mar 2007

Posts: 73

Likes: 0

99 is drums but the shocks are mounted on the back of the axle and the 94 is on the front.

May 14, 2008 | 07:02 PM

sclariat

Junior User

Joined: Apr 2008

Posts: 99

Likes: 0

From: Manitoba

Well if swapping the whole housing won't work, yes the posi carrier from the 94 will fit your 99 provided they are both 31 spline axles.

May 14, 2008 | 07:13 PM

Hillbilly_Deluxe

Thread Starter

Junior User

Joined: Mar 2007

Posts: 73

Likes: 0

What is involed in swapping the carrier? any special tools needed? anything i should replace or look for while Im in there?

thanks

May 14, 2008 | 09:38 PM

sclariat

Junior User

Joined: Apr 2008

Posts: 99

Likes: 0

From: Manitoba

most of the time, if you use the factory diff shims in your truck, you will get a good contact pattern and gear backlash. Get yourself a dial indicator. The backlash should be between .006" and .012" but you'll still be fine up to .018". Don't mix up the diff shims or bearing caps. The ring and pinion are a matched set so don't think you can use the ring gear that's already mounted on the posi in the other truck. All you want is the posi and R&R the ring gear. Put lots of tread locker on the crown bolts and torque them down good.