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.
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Hello! This could be from a few things - you could have a differential pinion gear that is misaligned and that will cause a howling noise - or it could also be a wheel bearing. Check your differential fluid and it might be worthwhile changing it.
The problem is almost always caused by the clips that hold the clutch disc in place on the po-sirear-ends.The clip will come lose and catch between the carrier clamp and cause metal parts to be deposited in the housing causing the front and rear pinion bearing to wear. Howling while accelerating is the rear pinion bearing. Howling while decelerating is the front pinion bearing. Sometimes you can get by with just replacing the clips and pinion bearings. Clips can be ordered out of California. For around $70.00 .The dealer will want to sell the entire assembly. Which does not include the pinion and bearings. The longer you go the more damage that will be done. If you can't do this yourself. No one is going to repair just part of the assembly and warranty.
You have to remove the axle shafts first as it has a full-floating axle, then pull rotor and hub off the axle housing. Unbolt rotors from hub. Check bearings and seals in hubs and the axle snouts where the bearings run before installing. Put new flange gaskets on axle and torque flange bolts to 95 ft-lbs.
Need a little humor now and then, anyway it sounds like you have a pinion gear bearing that's noisy, they really howl when they get worn out, in order to change this bearing the rear end gears must be removed, new bearings should be installed on all parts, 4 total, the metal from the failed pinion bearing will ruin the rest of the bearings, might as well only do it once, also change the axle bearings and seals while you are in there.