Rear Diff Fluid Question
03-21-2013, 08:48 PM
#1
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Rear Diff Fluid Question
Hey guys,
Im going to switch out the rear diff fluid on my 2007 Sierra 1500 and had a question. According to the manual it requires SAE 75W-90 Synthetic, do I have to add anything to it? I know when I did a fluid change on my Chevelle I had to add a posi additive. Is that still necessary or have they gotten away from that?
Thanks in advance,
Brian
Im going to switch out the rear diff fluid on my 2007 Sierra 1500 and had a question. According to the manual it requires SAE 75W-90 Synthetic, do I have to add anything to it? I know when I did a fluid change on my Chevelle I had to add a posi additive. Is that still necessary or have they gotten away from that?
Thanks in advance,
Brian
03-21-2013, 09:20 PM
#2
SAE 75W-90 Synthetic Axle Lubricant 89021677 (Canadian P/N 89021678) or equivalent meeting GM Specification 9986115
No additives required any synthetic meeting the specs above. Mobile1 synthetic 75W-90 would be sufficient
No additives required any synthetic meeting the specs above. Mobile1 synthetic 75W-90 would be sufficient
03-21-2013, 09:24 PM
#3
1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Make sure the vehicle is level.
3. Inspect the rear axle for leaks. Repair as necessary.
4. Clean the area around the rear axle fill plug.
5. Remove the rear axle fill plug.
6. Fabricate a dipstick from a pipe cleaner or similar item. Form the pipe cleaner into an “L”.
7. Insert the pipe cleaner into the fill plug opening with the stem facing down.
8. Remove the pipe cleaner and measure the distance from the bend in the pipe cleaner to the lubricant level.
Specification
The distance between the bend and the lubricant level should be 15–40 mm (0.6–1.6 in).
9. If the measurement is greater than 40 mm (1.6 in), add lubricant until the level is between 15–40 mm (0.6–1.6 in) from the bottom edge of the fill plug hole. Use the proper fluid. Refer to Fluid and Lubricant Recommendations.
Notice: Refer to Fastener Notice.
10. Install the rear axle fill plug.
Tighten
Tighten the rear axle fill plug to 33 Y (24 lb ft).
11. Lower the vehicle.
2. Make sure the vehicle is level.
3. Inspect the rear axle for leaks. Repair as necessary.
4. Clean the area around the rear axle fill plug.
5. Remove the rear axle fill plug.
6. Fabricate a dipstick from a pipe cleaner or similar item. Form the pipe cleaner into an “L”.
7. Insert the pipe cleaner into the fill plug opening with the stem facing down.
8. Remove the pipe cleaner and measure the distance from the bend in the pipe cleaner to the lubricant level.
Specification
The distance between the bend and the lubricant level should be 15–40 mm (0.6–1.6 in).
9. If the measurement is greater than 40 mm (1.6 in), add lubricant until the level is between 15–40 mm (0.6–1.6 in) from the bottom edge of the fill plug hole. Use the proper fluid. Refer to Fluid and Lubricant Recommendations.
Notice: Refer to Fastener Notice.
10. Install the rear axle fill plug.
Tighten
Tighten the rear axle fill plug to 33 Y (24 lb ft).
11. Lower the vehicle.
03-22-2013, 08:11 AM
#5
Run whatever oil you want within these simple limitations. Synthetic oil without any kind of limited slip additive. As far as viscosity it will be fine with 75W90 in the rear..... or 80w90... or 75w140 lol. I have Amsoil everything in my stuff solely because a close friend of mine sells it...... that's it. I have 75W90 in the front of my 05 and 75W140 in the rear..... both Amsoil. I don't have a gov lock anymore either lol.
Your t-case does not use gear oil if that is what you meant. It uses a blue friction additive equipped type of atf that is only really sold by vehicle dealers. GM or Chrysler sell it as they both use the autotrack NVG 246 transfer cases.
If you just meant the front diff I apologize and honestly whatever you choose for the rear diff will work just fine in the front.
Your t-case does not use gear oil if that is what you meant. It uses a blue friction additive equipped type of atf that is only really sold by vehicle dealers. GM or Chrysler sell it as they both use the autotrack NVG 246 transfer cases.
If you just meant the front diff I apologize and honestly whatever you choose for the rear diff will work just fine in the front.
03-22-2013, 08:23 AM
#6
I am new to the forum. There might be some amsoil dealers that are sponsors on the forum. I stock amsoil at my shop, its a excellent product. there are plenty of dealers on the web you will probably pay more for asmoil than mobile, not so sure that its worth the bother unless you can find a local dealer.
03-24-2013, 09:23 PM
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Run whatever oil you want within these simple limitations. Synthetic oil without any kind of limited slip additive. As far as viscosity it will be fine with 75W90 in the rear..... or 80w90... or 75w140 lol. I have Amsoil everything in my stuff solely because a close friend of mine sells it...... that's it. I have 75W90 in the front of my 05 and 75W140 in the rear..... both Amsoil. I don't have a gov lock anymore either lol.
Your t-case does not use gear oil if that is what you meant. It uses a blue friction additive equipped type of atf that is only really sold by vehicle dealers. GM or Chrysler sell it as they both use the autotrack NVG 246 transfer cases.
If you just meant the front diff I apologize and honestly whatever you choose for the rear diff will work just fine in the front.
Your t-case does not use gear oil if that is what you meant. It uses a blue friction additive equipped type of atf that is only really sold by vehicle dealers. GM or Chrysler sell it as they both use the autotrack NVG 246 transfer cases.
If you just meant the front diff I apologize and honestly whatever you choose for the rear diff will work just fine in the front.
.
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03-24-2013, 09:24 PM
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I am new to the forum. There might be some amsoil dealers that are sponsors on the forum. I stock amsoil at my shop, its a excellent product. there are plenty of dealers on the web you will probably pay more for asmoil than mobile, not so sure that its worth the bother unless you can find a local dealer.
04-29-2013, 04:00 PM
#10
Hmm odd. Your truck has an 8.6" 10 bolt but the housing is the newer style and has a different shaped rear cover. On another site a member stated his had a reusable type gasket of some kind on the rear cover. A trip to a dealer would let you know one way or the other before you pull it. RTV does work fine on it's own though too, but I prefer a gasket myself.