Question about 2002 GMC Yukon XL

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GMC rear differential

Is there a rear differential drain plug? I see a filler plug. If not do you have to remove the whole pumpkin, then fill it?

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  • Anonymous Mar 30, 2014

    cant grt drain plug out to refill

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There is no drain plug. You have to take cover off to drain. After it has drained, clean cover surface and housing surface, if gasget is ok not mared or broken you can reuse it with a thin layer of silacone, if its tore up to bad clean old gasget off real good and you can either get a new gasget or use silacone, and put it back on and refill it thru filler plug, and fill until it comes out filler hole, if you use silacone make sure you use enought, like a quarter to a half inch wide bead and let it set a while before you put the rearend grease back in maybe a half hour or so. That way it has enought time to set up.

Posted on Feb 21, 2009

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Posted on Jan 02, 2017

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My gear oil from the rear wheel bearing is leaking how do i replace the seal? Secondly, How can I fill in the differential with gear oil cause I tried but can't see fill in or drain plugs along the...


You will need to remove the rear diff cover. There is a small bolt that secures the pin that the spider gears ride on. remove this bolt, and then remove the pin(you might call it a shaft). Remove the caliper and rotor from the side you are replacing, and push the axle in. Inside the differential, you will see what we call a c-clip on the end of the axle shaft you just pushed in. Sometimes this clip if it is in the right position, will fall out on it's own. If not, slide it off, and go pull the axle out. Now you can pry out the seal and replace it. There will be a pipe plug with a square recess on the front side of the differential. You can put a 3/8 drive ratchet in the recess and unscrew it. This is the fill plug. You fill the rear end untill it runs back out of this hole. It will be located about half-way up from the bottom of the differential housing.

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There should be a filler plug on top of the diff housing, it will have a square recess that will accept a 3/8" drive extension for removal.

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How do I change the rear and front Differential fluid?


There is a drain plug on some vehicles at the bottom side of the differential that must be removed to drain the old oil out but on others you must remove the cover which has at least ten bolts that are in a circle pattern around the differential cover. After removing the cover and draining the old oil out dry out the excess oil left inside the casing with a clean rag, scrape off any old gasket material on both the differential casing and the cover. Purchase a gasket for the cover and reinstall the cover tightening the bolts in a criss cross or X pattern not too tight . Proceed to locate the filler plug on the upper right or left side of the differential, this plug is usually removed with the square end of a 3/8" socket wrench just using the square end of the socket wrench should do it or you may need a large hex head allen wrench but usually using a short extention with the socket wrench to get the clearance to turn the square end of the extention or socket wrench inside the plug will work, some times the plug is very tight and you may need to use a 1/2' drive socket wrench with a 1/2" to 3/8" reducer or adapter to acheive the neccessary torque required to crack the filler plug free, now get a coulple of 80/90 weight gear oil quarts and cut the filler tip back a bit with a razor or utility knife and using a 3/8" length of rubber hose slide it over the end of the tip tighten a small hose clamp on to the hose to prevent it from sliding off the filler tip, then feed the end of the hose into the filler hole on the differential and invert and sqeeze the container of oil to force the oil into the differential until it fills and over flows out the filler hole, screw in the filler plug and tighten. Use this general procedure for both the front and back differentials.

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Where do i put the differential gear oil


Front Differential Oil Change dd7e0eb.gif
  1. Before changing or inspecting oil, be sure to stop engine and lift vehicle horizontally.
  2. With vehicle lifted up, check leakage. If leakage exists, correct it. NOTE: Whenever vehicle is hoisted for any other service work than oil change, also be sure to check for oil leakage.
  3. Remove oil filler plug (2).
  4. Remove drain plug (1), and drain old oil.
  5. Apply sealant to thread of drain plug (1), and tighten it to specified torque.Tightening torque Differential oil drain plug a: 23 Nm (2.3 kg-m, 17.0 ft. lbs.)
  6. Pour new specified oil until oil level reaches bottom of oil filler plug hole (3) as shown in figure. NOTE:
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    • It is highly recommended to use API GL-5 80W-90 gear oil.
Differential oil specification: API GL-5 (For SAE classification, refer to viscosity chart [A] in figure.)

Differential oil capacity (Reference): 0.9 - 1.1 liters (1.9/1.6 - 2.3/1.9 US/Imp. pt.)

  1. Apply sealant to thread of level / filler plug, and then tighten it to specified torque. A: Sealant 99000-31260SUZUKI Bond No.1217G Tightening torque Differential oil level / filler plug b: 23 Nm (2.3 kg-m, 17.0 ft. lbs.)

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1 Answer

How do I change the rear diff. oil?


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FIRST - loosen & remove the upper cap...just in case.
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Install drain plug, tighten to spec. (snug)
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