Question about 2007 GMC Sierra 2500HD

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Oil leaking from front differential hose line

How do I check the oil level to insure there is enough oil in the gear box? I have a leak from possible over pressure from running 4x4 on freeway without knowing until I went to take a slow turn when reaching my house.

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There are to plugs on the passenger side of the center carrier. The top one is the fill plug. Remove this plug and fill to this hole. If you are familiar with filling a rear dif then it is the same method. Please rate or tell me if you need more help.

Posted on Dec 26, 2008

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Posted on Jan 02, 2017

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Replacing a bearing requires pulling the axle so the old bearing can be forced off with a hydraulic ram and the new bearing installed. As with front bearings, the oil seals or O-rings must also be replaced so oil from the differential doesn't leak onto the rear brake linings. Be sure to check the oil level in the differential if the old seals have been leaking, and top off the level if low with the recommended gear oil. I provided you a link for this issue.

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Where is the fill plug on the diffirential on a 1999 jeep grand cherokee laredo"


How to Fill a Rear Differential
You may need to add fluid to your differential due to leaks or changing seals, or it may be time to change out the gear oil completely. Either way, it's just a few steps to fill the rear differential and get your vehicle back out on the road!This article will explain how to fill a rear differential. jQuery('.intro .thumbnail').each(function(i,e){ jQuery(e).find('img').one('error',function(){ jQuery(e).remove(); }); }); Difficulty: Moderate
Instructions and Things You'll Need:
  • 3/8 inch drive ratchet with extension
  • 2 quarts gear oil (gear lube, differential fluid)
  • Side cutters
  • Oil drain pan
  • Shop rags
  • Flashlight or shop light (optional)
  • Lock tight (optional)

Filling a Rear Differential
  1. Be sure the car is raised on four jack stands and is level. It will be more difficult to fill the differential if you've only got it raised in the rear.
  2. Place an oil drain pan underneath the plug to catch any leaks or drips. Keep shop rags handy for any spills.
  3. Check your service manual for the amount of fluid your differential needs, if you're completely refilling the system. Two quarts should be enough in most cases.
  4. Remove the spouts on the gear oil containers. Peel off seals, then replace spouts. Use side cutters (or any cutting tool you've got handy) to clip off the top of each spout.
  5. Remove the differential fill plug using a 3/8 inch drive ratchet with extension. (Some models may require a hex key or screwdriver, but the 3/8 inch is the most common plug design.)
  6. Take the gear oil container and fit the spout into the fill hole. Pour the fluid inside. You can gently squeeze the bottle to speed the process. Repeat with a second bottle if necessary.
  7. Fill the differential until the fluid starts draining back out of the hole.
  8. Clean and replace fill plug. Use lock tight (thread locker) to help seal if desired. You can see my eHow article "How to Replace Rear Differential Fill Plug" (video) for more information.
  9. Take the car for a drive around the block to get the gear oil moving. When you return, check underneath for any leaks from the fill plug or differential cover.
Hope help with this.

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Hi !
You will need to see weather the oil leak is in the front middle or real side.
If from front then it is leaking from engile sump or the oil filter.
If from middle then the gear box is leaking .. will need to change the gasket.

If from rear then the differential is leaking... either it will be from the differential drain nut .... or from th emain differential assey... here again you will need to get a new gasket...

REgards
Berry

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