2019-2024 Sierra/Silverado: Rear Differential Service
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- เผยแพร่เมื่อ 24 ก.ค. 2024
- How to change the rear differential oil on a 2019-2023 GM 1500 chassis. There are two production options (RPO's), SU7 and SU8. The SU7 is manufactured for GM by American Axles & Manufacturing (AAM), while the SU8 is produced by GM. This video showcases the service procedure while highlighting differences in axle identification, part numbers, fluid types, and capacities.
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AAM/SU7 Rear Axle (most common)
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GM/SU8 Rear Axle
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75W-85 10-4122 (GM/SU8) not currently available on Amazon
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The service procedure is the same for several models and years, including; Sierra, Silverado, Yukon, Tahoe, Suburban, Denali, and Escalade. 2019, 2020, 2021, 2022, 2023,2024.
CHAPTERS
0:00 Axle Identification
0:30 Fluid level & condition check
0:50 Drain & Clean
1:47 Threadlocker & Install
2:30 Fluid Type & Capacity
2:58 Final Level Check - แนวปฏิบัติและการใช้ชีวิต
Probably one of the best diff fluid change videos on TH-cam for these trucks. In a matter of 3 minutes this man gave us every single piece of information we'll need from start to finish. Bravo 👏.
2024 GMC Sierra 1500 w/ LZ0 diesel. My rear differential doesn't look exactly like either of those shown at beginning of this video. Guess I'll contact GM for full RPO code list for my vehicle.
* figured it out: AAM
Thanks for quality maintenance videos! Much appreciated.
Clean job. Thanks for helping identify the axle!
Very good video with all the specs that are needed to do a great job. Please keep up this kind of video in the future. You are truly a great mechanic. I will be watching you!
Nice job. Straight and to the point. My kind of style.
Excellent video, thank you
25 years ago I used to work at one of the popular oil change franchises. We would do differential fluid changes regularly. They were just $14.99 or $19.99. Of course back then new vehicles still came with a drain plug on the differential. I’m not sure why the manufacturers ditched the drain plug. It sure made the process easy.
I inquired with a local oil change shop about changing my differential fluid and they were charging $225! Seriously?!!
Times have changed…..
FYI the gasket is re usable. It has metal in the middle of it. GM has used them for YEARS like that.
Definitely. I reuse mine for 2 changes and then replace it on the 3rd.
I’m sure I’m almost due for the service as I have 80k miles on my truck this video was super helpful and informative
did you check or pull some oil out of the fill plug? This guy changed his gear lube way early as you could tell.
@@rayray1846
No I have not but I’m simply going to take my truck in for this service as I have extended warranty on the truck so if anything happens to that part I have it documented that the dealership did the service and it’s there fault if there’s an issue
I usually do mine at about 35k. Cheap insurance!
I’m sure this is the same for the 2.7 2021 Sierra … looks super easy and I’m sure it will save me money by doing it myself rather than taking it to the dealership and waiting an entire day for most likely 20 mins worth of work
Does this Video pertain to a 2017 GMC Sierra 5.3 4×4
My 2022 (refresh) GMC 1500 Denali 5.3 does not mention anywhere in the manual to change diff fluids. Its mentions transmission and transfer case, but nothing at all on the rear diff. Anyone else notice this?
Great vid...question...can you access everything without removing spare tire / heat shield? (Looks like your shield was still on)
Yeah, I didn't have to do anything with the tire or shielding on this service
Do these axles require any sort of friction modifier for the limited slip rear differential? I know the G80 is a locker but I seem to recall years ago them needing that additive or they would chatter going around corners.
that's what I'd like to know too
They do not need additives anymore, Friction modifiers are harmful
The friction modifier is part of the gear oil spec now.
Question. Should I use 75W90 or 75W140 I live in South Florida and tow once in a while the dealer is gonna bill 75W140 full synthetic.
@BobBob-qt1eo down in Miami the dealership used the 75W90 on my buddy's 2020 Silverado.
Noob question. You don't put any kind of gasket sealant on the differential when installing the new gasket?
Good question, the procedure calls for replacing the gasket when the service is done, but no other sealant is required.
Technically you don’t use sealant with them, leaks are not nice. Whatever you put on you may have to get off again sometime - maybe some gaskacinch on the cover side to hold it in place, and some light grease on the pumpkin side to allow the gasket to “float” with expansion and contraction of the metals. Next time I remove mine I plan to install a lubelocker gasket they look formidable.
How often should you change this fluid? I checked the manual, but I didn't see this service, which I thought it was weird 🤔
Typically 30-60k. If you are towing a lot, heavy start/stop traffic, high heat, you'd want to change it on the earlier end. Easy everyday driving/highway, you can stretch out the service.
Newb question. Do you put thread lock on the fill plug when you're all done also?
No, but you could use thread tape or paste on the threads if you were concerned about it leaking.
Thanks.
My dealer just siphoned out the rear differential fluid and put in new fluid without removing the cover. Was this the wrong way to do it? Will it make a difference in the long run?
That's an acceptable method. You'll get a little more fluid out and have the opportunity to inspect the gears by removing the cover, but extraction is a common practice.
Some are easier than that even and have a drain plug on the bottom of the axle - you can drain it and make a decision whether to open the cover or not. If the fluid looked good and clean you might just refill it and move on. If the drained fluid looks nasty you might tear into it more. Lots of covers have a magnet on the inside as well, I will often add another ceramic ring magnet to the outside of the cover with a glob of advesive if I am not opening the cover.
Does the drain plug have a crush washer. I’ve done this twice there was not a crush washer. Thank you
I don't remember mine having one either
They are usually a pipe thread not a contact flange
Did you put thread lock on the fill plug after filling it up at the end?
@@MichaelFernandez-vv2st don’t use threadlock here
@@kellismith4329Thanks