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remove the rear cover all the bolts except the top 1 just loosen that 1. Put a bucket under the rear diff and open the diff cover and drain out the fluid. clean and reseal the diff. remove the plug on the front of the diff and fill with the correct diff fluid until it is filled up to the hole and replace the plug, clean up and check for leaks. No leake = job is complete.
If you have a locking rear diff,it could be the clutches on the side gears or lack of fluid and special additive. Sounds like the wheel speed is off enough on corner,to set the ABS light,when it chatters. Don't over look parking brake and rear caliper issues.
most parts will interchange,however,the front brakes,the calipers and lockouts will be different.the rotors should be the same,the rear diff-as long as the ratio is the same,trans is different,not sure about the transfercase
Fairly simple job...Unbolt everything connected to it, take it out, put new one in and replace everything you unbolted. Support the frame, so you can get the unit out and nothing but the diff comes down after all hardware is out. Most bolts are really tight and rusted , so be prepared to have them fight you and when getting one from junkyard, ask if you can have the hardware with the unit so you have spares on hand. When buying the replacement, make sure it has the correct size driveshaft yoke on it. This is a good opportunity to custom tailor the diff to your needs...count the ring gear teeth on yours and then divide by the number of teeth on the pinion this gives you the ratio. If you do a lot of low speed driving and pulling loads, you may want to change to a 3.90 ratio or even a 4.11. If you do a lot of long high speed driving, go to a 2 series rear ratio. If you are happy with what you had, match that. (changes require speedometer gear change or it will be a bit off) Always change the diff lube when you change a diff. Never buy one without removing the cover and looking at gears and checking for fine metal in the lube. Good luck!
sound's like your front diff is seized :( could be wrong but id check your front diff fluid for level, color and any metal shaving's as they will be a good start. hope this helped.
I Am a Mechanic I have mainly worked on diesel for the last 12 years I have a 2004 F-150 FX4 EXT CAB TOW PACKAGE 5,4 4X4 WITH 9.75 rear end. I had the same problem I drained my rear end and put motorcraft and the limited slip addative I got from the ford dealer here in town. SAME PROBLEM. I drained the rear end again. put in amsoil and 2 "I said 2BOTTLES OF LIMITED SLIP ADDITIVE." that was almost 1 yrs ago I havnt had any problems since and I spend about 3/4 of the time pulling a trailer.
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