Will a 2006 silverdo rear differential with drum brakes and 4:10 gear fit a 2004 silverado rear diffferential with disc brakes and 3:73 gears

Measure the lenth of both rear ends. see iss all hardware will bolt up without fabrication. if its the same size it will work. But im afraid being a 4 wheel drive it will be geared lower then a regular pick up/ Drive shaft may work but if not it would have to be shortened or lenghthebed. alot of work. Brakes you could leave the non drum breaks on better stopping power. I honestly believe you would be better off just going to a scrap yard and find one very easy to remove and replave few hour job.

If the rear end has a wine after a rebuild it is more than likely set up (shimmed) incorrectly. Take to a reputable mechanic who specializes in rear differentials. Some new gears will whine regardless of shim, but should be somewhat quieter than a bad rear end. If the gear pattern is correct look to the outer axel bearings.

Its easiest to buy a hanes manual for this vehicle for this repair. Here goes. Remove the tire and wheel. Remove the drum if drum brakes or brake caliper and rotor is its disc brakes. remove the cover on the rear differential. remove the small bolt that holds the lock pin in place. slide the lock pic out of the spider gears. **its very important not to let the ring and spider gears turn at this point or the spider gears will fall out of the carrier. Once the lock pin is removed then go around to the axle where the tire was and push it in (toward the rear end) as far as it will go. Go back to the differential and remove the retainer clip (looks like a big "C") from the axle shaft. You can now pull the axle completely out of the housing. At this point you will be able to see the axle seal and the wheel bearing located behind the seal. Carefully remove the old seal (be sure not to damage the wheel bearing) and install the new one. You can then put everything back together. Make sure to refill your differential with oil when everything is back together. check your owners manual for the exact gear oil that you need because these cherokees can use different types depending on the model and towing capacity.

Removal

1. Raise vehicle and place jackstands under rear frame crossmember. Lower the hoist so that rear axle housing is at suitable working height.
   

1. Remove axle housing cover from rear axle housing and drain lubricant.
   

1. Perform the inspection before disassembly.
   

1. Remove rear wheels, rear disc brake calipers and rear disc brake rotors.
   
2. Working through cover opening, remove differential pinion shaft lock pin and remove differential pinion shaft and differential pinion gears (4215).

NOTE: THIS IS FREE INFORMATION!!!!

1. Remove rear brake anti-lock sensor . Push axle shaft inward until u-washers at button end of the axle shaft are clear of side gear recess.
   

1. CAUTION: Do not damage inner wheel bearing oil seals when removing axle shafts from rear axle housing. In addition, axle shafts should be completely removed from rear axle housing.
   Remove u-washers and pull axle shafts out of the rear axle housing.

Is the clunk noticed as soon as the brake pedal is released? Your brake shoes engage in the rear drum when the brake pedal is pressed and then release as the brake pedal is released. Your shoes may be worn and might be "hanging up" for a brief period, that would make a clunk sound your describing

To change the rear seal, yo will need to raise and support the rear of the vehicle. Remove the wheels and drums or rotors (depending on drum or disc brakes.) Remove the rear differential cover bolts and the cover (have a drain pan under the differential) You will likely need to turn the driveshaft so the center pin bolt is acessible at the back or the differential. This is a 5/16" (or 8mm) bolt that is on the right (passenger) side of the differential carrier assembly. I recommend a new bolt be installed here on reassembly. Once the retaining bolt is out, slide the center pin out enough to allow the axle shafts to be pushed in toward the center of the diff. to remove the "C" clips that retain the axle shafts in the carrier assembly. Be careful if you happen to pull the center pin all the way out not to allow the carrier assembly (has the ring gear mounted on it) to turn, as this can rotate the spider gears out of alignment causing a headache on reassembly. With the "C" clip removed the axle shaft can be pulled out of the diff. Inspect the bearing area of the shaft for rust, pitting, or scoring. Remove the old seal and carefully install the new one. Reverse proceedures to install. Take care to note the "C" clips and center pin bolt are properly reinstalled. Fill with 2.5 to 3 quarts of rear axle grease for you vehicle.
good luck.

Get the rear wheels off of the ground, remove wheels, and drums. (Rotors if you have those)
Remove rear cover (use a drain pan to catch fluid)
Look for the 5/16" or 8mm head pin bolt and remove it.
Turn the differential so you can get the pin out. (goes through the center)
Push you axles inward and with a small magnet, take both "C" clips out from the inner part of the axles.
Now slide out you axles. (Careful on the outer seals)
Mark your carrier bearing caps so you know what is left or right, and remove them both.
Find out what size the bolt heads are for the "ring" gear and get two wrenches to fit. (Usually 19mm or 3/4")
Hold one on a bolt head on the top side and put the other wrench lower.Force the lower wrench upward, as this will push the upper wrench into the housing and "push" the differential out. When removing be aware that there are spacers that need to go back where they came from. DO NOT MIX THESE UP. These spacers are under the carrier bearing caps, left and right of the differential.
Note, four spider gears is a normal differential, requires gear oil. If it has clutch packs, it is a limited slip and requires gear oil and limited slip additive!!!

remove wheels, brakes, diff. cover, and slide out spider gear pin. the pin holding the little gears in place in the diff.. this probably has a screw or bolt holding it in. remove spider gears upper and lower with bushing plates. push axles inward to remove the big c clips, slide axle out. be careful not to damage the axle seals with the teeth on the axle. reverse order to reinstall

check the gear oil in the differential , check if the oil is burned or low ,may indicate you need gear fluid as its working harder under a load. have a mechanic check the diffferential gear teeth for wear or slippage.

Block the front tires. Break the rear lugs loose. Jack up the rear of the truck at the center if possible. remove the wheels & brake drums. Remove the brake shoes,return springs & all the other hardware. Remove the differential cover & drain oil. If you have a posi the next step sucks. You need to remove the threaded pin from the housing & remove the axle retaining clips. All the while,being carefull of the spring in the posi unit. If no posi,then same procedure,minus the "pucker factor". After the axle is out,take a large flat blade screw driver or pry bar & pop the seal out. Keep in mind the axle bearing is probably gone too , so that's another procedure. Keep it apart,you'll be glad you did.