Question about 1998 GMC Sierra

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How much rear end oil does it take

How much gear fluid do u need

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Generally, you would remove the rear diff inspection cover to drain the housing. Once drainer, you would clean of the old gasket or sealer, install a new gasket or a new bead of sealer and reinstall the cover plate. Then, you would remove the bolt or screw that is built into the cover plate, insert the fill wand or bottle tip and start filling the differential. Keep filling until the fluid starts to run out of the bolt or screw hole. Reinstall the bolt or screw, clean up any excess fluid and your done.

Posted on Mar 29, 2014

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Check the specs in your hand book or workshop manual but normally 2 pints will cover it . make sure that you use the correct oil. If it is s limited slip differential you can ONLY use Limited slip oil but if it is a normal diff then you can use either oil The grade should be oep 8w-90

Posted on Mar 29, 2014

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1 Answer

Changing rear end oil


Most rear differentials, it's a drain and refill operation.

SOME differentials have a drain plug, but others have ONLY a fill plug.

If yours doesn't have a drain plug, then you need to suck the old fluid out, with suction/transfer pump:

http://www.harborfreight.com/gear-oil-and-fluid-pump-61746.html

You can also use this to refill with the new fluid.

Most rear ends are filled to the bottom of the fill plug hole.
If you overfill, just let it overflow/drain until it stops dripping.

Now, different differentials require different fluids, so check what you need.
It might be in the owner's manual.

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Hey, Welcome to FixYa!

If you have already purchased your 80-90W gear oil you will notice how the bottle is shaped. Long and has a nozzle at the end. Simply park your truck on flat level ground. Remove the Circle rubber inspection plug on the rear end cover. Then begin filling it with fluid. Continue to add fluid until Oil just starts to run out of the hole. Replace the plug and your all set.

If i helped you please don't forget to rate me. Cheers!

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Sound like your rear end needs gear oil. If you look at the backside of your rear end about halfway up there will be a bolt that should be 9/16 in size, you take that bolt off and you stick you finger in there to see if theres fluid. If you don't feel fluid then you will need to ad some. When you go to get your gear oil there is a pump like thing they have at the auto part store that will thread on to the gear oil contiainer and it has a hose on it, you stick the hose in the bolt hole and pump the fluid in until it starts to come back out. hopefully this fixes your problem and it definately sounds like thats your problem

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Could be low on differential fluid, leaking from the wheel seal. The Differential gears could also be worn from low on fluid or ears was not lined up and have worn it self out.

Service the rear end, inspect the fluid's condition and measure the any play in the gears in the rear end replace is worn out.

You may buy some time by running 50% to 100% Lucas oil treatment in your rear differential. Good luck and hope your differential is not to badly worn.

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1 Answer

There is a clanging noise when i put it in gear and can hear it while driving is it the rear end or universal joint


Check rear-end fluid level and play in rear pinion gear.
Check universal joints for play. If play is in pinion gear change rear end fluid and add a full bottle of LUCAS oil stabilizer, will quiet rear end noise.

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85 f250 2wd, 6.9D, 4spd, Dana 60 rear


Look on the back of the wheels by going under the vehicle. and tell me if you see a light oil. I am sure yours is a sealed pumkin. If not the oil in the pumkin may have leaked out

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1 Answer

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i think what you are talking about is the front differential. you will wanna put gear oil in it. the correct weight would be found in your manual.


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