Question about 2000 GMC Jimmy

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I'm trying to service the rear differential but can't find the plug 2 put my gear oil in...help pls...

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  • GMC Master
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The plug is located on the housing and you use a rachet to remove,
if you look at the diff from the front where driveshaft connects, follow the housing on the side is the plug.

Posted on Oct 08, 2010

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  • Expert
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Hi,I'm not familiar with your model but most all vehicals are set up the same,it should be towards the top of the differential will require a pump with hose to fill ( you can get pump kit from any auto-zone or napa,ect.)might be a flush plug with a square opening for a 3/8" or 1/2" ratchet( might not be able to see with your eyes,might have to fill for it with fingers) yz-maniac.

Posted on Oct 08, 2010

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  • GMC Master
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Look up high, on the differential case. Fill the gear oil there.

When I looked it up on my online resource it says there is a vent hose at the top of the differential, #7.

Rear Axle Axle Housing Assembly Removal & Installation To Remove:
Exploded view of the rear axle mounting I'm trying to service the rear differential but - 88457g85.gif

  1. Raise and support the rear of the vehicle safely using jackstands under the frame. Position a floor jack or a second set of jackstands to support the rear axle housing. If a floor jack is being used, take care when removing the U-bolts to keep the axle from suddenly dislodging.
  2. Remove the rear wheels and drums for clearance and to remove some weight from the axle housing.
  3. If equipped, remove the axle vibration dampener.
  4. Matchmark and remove the rear driveshaft from the pinion flange. Either remove the shaft completely from the vehicle or support it aside from the undercarriage using safety wire, but DO NOT allow the shaft to hang from the slip joint.
  5. Remove the shock absorber-to-axle housing retainers, then swing the shock absorbers away from the axle housing.
  6. Disconnect the brake lines from the axle housing clips and the backing plates (wheel cylinders). NOTE: When disconnecting the brake lines from the wheel cylinders, immediately plug or cap the lines to prevent system contamination or excessive fluid loss.
  7. If applicable, unplug the speed sensor connectors at the junction block.
  8. Disconnect the parking brake cable(s).
  9. Disconnect the axle housing-to-spring U-bolt nuts, washers. U-bolts and the anchor plates.
  10. Remove the vent hose from the top of the axle housing.
  11. Remove the axle with the help of an assistant by moving it to clear the leaf spring, or if desired, the leaf springs can be disconnected from the frame at the rear end to lower the axle down and back, but first refer to the leaf spring procedures for information regarding spring installation and removal.
To Install:
  1. With the help of an assistant, carefully position the rear axle into the vehicle.
  2. Connect the vent hose to the axle housing.
  3. Be sure the housing is properly positioned on the leaf spring, then loosely install the U-bolts, anchor plates, washers and nuts.
    • Tighten the U-bolt nuts in a cross pattern to 18 ft. lbs. (25 Nm) to make sure everything is evenly seated. Then tighten the nuts in steps to 41 ft. lbs. (55 Nm) on 1994-95 models or 74 ft. lbs. (100 Nm) on 1996 and later models.
  4. Remove the caps from the brakes lines then connect the lines and secure them to the axle housing.
  5. If removed, connect the parking brake cable(s).
  6. If applicable, attach the speed sensor connectors to the junction block.
  7. Align and install the driveshaft assembly. Refer to the procedure earlier in this section for details.
  8. Install the shock absorbers to the lower mounts, then tighten the mount nuts.
  9. If equipped, install the axle vibration dampener.
  10. Install the brake drums and the tire/wheel assemblies.
  11. Properly refill the brake master cylinder and bleed the hydraulic brake system.
  12. Check the fluid level in the rear axle assembly and add, as necessary. Make sure the vehicle is level when checking and adding fluid.
  13. Remove the jackstands and carefully lower the truck.
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Posted on Oct 08, 2010

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6ya6ya
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Posted on Jan 02, 2017

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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
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  2. Place an oil drain pan underneath the plug to catch any leaks or drips. Keep shop rags handy for any spills.
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  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.
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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.
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