My 9.75 rear axle is making constant wirr sounds when pushing the gas pedal. It also chatters some at stop and go turns.
I was wondering what's my cheapest route I can go here? Do I need a full bearing kit and a full rebuild kit? Wish they had a cheap mini spool... I want to try and do myself.
any help or guidance would be greatly appreciated

 

If it has a traction lock you probably only need to change the diff fluid and add 2 bottles of Ford friction modifier. MY 2000 F150 5.4 had a TL and it started chattering on corners at about 80K miles. A fluid change didn't fix the chattering until I added a second bottle of FM. Seems the 2000 TLs were set up a little too tight. There was a tech bulletin from Ford saying to rebuild the TL and reduce the shim preload by 0.010". But a second bottle of FM did the job by getting rid of the chattering. I know this Diff lasted 170K miles before I lost track of it.

 

I'll give it a shot thanks.

 

Didn't work... still loud whine

 

A loud whine sounds like a bearing problem. Could possibly be the pinion bearing.

 

Did the fluid get rid of the noise when turning?

 

How difficult to do pinion bearing with average tools? I've done pretty much everything but gears in my life.

Yes the chatter was gone on our short 15 mile trip to town or so with a couple stop and turns.

 

Check the Ujoints too, they can cause the driveshaft to be out of balance, causing the seals and bearings to wear out too

 

If a bearing is bad and not knowing which one it is, the diff will need to be disassembled, cleaned, and new bearing(s) installed. It is best left to professionals. if you want to try it yourself, you will need a dial indicator to set backlash, and a special tool to help crush the pinion preload spacer. Also a torque wrench is needed to check the pinion preload that measures in in. lbs., as well as another torque wrench to measure bolt torques. Find a shop that has experience with diffs and let them do it. If I had the problem, i would take it to the local 4x4 shop because they change gear ratios a lot and work for a lot less than the dealer.

 

Anyone run one of these? For the price I may as well just go this way then pay someone the same to rebuild it...
http://www.carmonkeys.com/2000-FORD-...939P-14mm-Lugs

 

I didn't see "traction Lock" mentioned in the ad. A 4x4 shop will rebuild yours for that kind of money.

 

But that's all new not just rebuilt

 

Nope! It's not even rebuilt.