Unhook your dive shaft from the rear end. Take your U bolts of off your springs. Make sure that you disconnect the break lines from the rear axle. remove your shocks. It should be free at this point. In stubborn cases, you may have to put a small jack in between the frame and axle and apply very light pressure. Hope this helps.
Lift truck, put on jack stands under frame, make sure tires are clear of ground, take four bolts out of drive shaft, be careful not to lose cups on universal joints,move drive shaft foreward, remove tires, remove brake drums, remove parking brake cables,remove flex hose to brake lines,remove bolts from spring hangers while supporting rear end, that is it
SOURCE: 2004 dodge ram rear end noise
while you had the cover off did you by chance look at the condition of the ring gear and spider gears...if it was run for any length of time low on fluid or with two different sized tires you may need some repairs but first inspect the ring gear and rotate till you can see the 4 little beveled gears inside the differential ....use a screwdriver and check for excess movement...look at the crossshaft and look for wear.....hope this points you in the right direction.
SOURCE: whinning noise in rear end on 99 dodge ram truck
Not terrible of a job to do. You will have to jack up the rear end and support it on stands and be sure to chock the front wheel so it does not roll forward while jacking it up. Remove the rear wheels and the drum assembly or rotor if disc brakes. Remove the rear differential cover be sure to have a drain pan to catch the fluid that comes out of it. Find the center carrier you will see a pin about 3/4 of inch in diameter going throught the center carrier with a bolt on one end remove the bolt turn chunk until pin comes out. Push the axle in enough to let the c-clip to be removed then pull out the axle. You will then have access to the axle seal and axle bearing. You will probably need a bearing puller with slide hammer to get bearing out. Then put back together.
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