z51 rear diff fluid
Thread Starter
Burning Brakes
Joined: Feb 2008
Posts: 1,192
Likes: 130
From: Senoia Ga
z51 rear diff fluid
I see all sorts of posts on the fluid for the rear diff fluid i.e.10-4034 but then some of the posts say if it has the electronic rear dif i.e Z51 you should use AT fluid 10-9394
Can we get this cleared up Thanks for the help
p.s. I have a 2016 z51
Can we get this cleared up Thanks for the help
p.s. I have a 2016 z51
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Z51 equipped cars (as well as the GS, Z06, and ZR1) have the electronic Limited Slip Differential....eLSD. Think of this as an add-on system to the basic differential. It is filled with ATF. You do NOT have to service this. The ATF is in there for hydraulic pressure against the pistons. It is a closed system. If you chose to try and service this system, you'll need the GM tools to bleed it properly. Unless you're installing a new or used unit that was disconnected from the eLSD pump, leave it alone.
Drifting
Joined: Apr 2018
Posts: 1,323
Likes: 928
From: Burnt Hills NY
In the 2014 I had the rear lube needed to have a friction additive. The GM fluid already had it but other brands needed to have it added. I always used the GM and never had an issue. I'm not sure if it's the same for a C8 but I expect it is.
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From: Charlotte, NC (formerly Endicott, NY)
Bill
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Thanks for the informative posts. Learned something about the eLSD operation today.
Racer
Joined: Aug 2023
Posts: 312
Likes: 248
From: Sewickley PA
I have a 2019 Grand Sport (A8), 13,500 miles. Would you recommend changing the differential fluid?
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From: Bonneville Salt Flats
",,, 2019 Grand Sport (A8), 13,500 miles. Would you recommend changing the differential fluid?" No, just check the fluid level and top-off to bottom of the check hole. Many required additional fluid when new to meet this GM method, though the differential manufacture CEO said on a public vid they all shipped with the correct amount. My 2018 St'ray took just over 8oz. All the best. 
5th Gear
Joined: Jul 2007
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Clarification on Corvette C7 eLSD
There are all kinds of confusing replies concerning eLSD fluids in C7 diff. I understand that the pump for the hydro-static portion of the unit uses ATF -6. My questions are; the clutch pack appears to be a wet pack. Is it running in the differential gear oil? From what I can find online, it appears that it is and the reference to ATF-6 is only used in the pump and is not part of the actual lube on the clutches. That makes me think that friction modifier is required as it would be in a conventional LSD. If so, not withstanding the 2014 low fill TSB, all the comments about what appears to be fine metallic particulates in the gear lube would be normal clutch material being shed.
Are there any eLSD experts that can verify or deny the actual operation of the lubrication of the differential?
I have seen many concerns about poor quality of the diff assembly, but the photos of the gear lube don't appear much different from any used lubricant from conventional LSDs that use clutch packs. (Again, not including Torsen type diffs).
Are there any eLSD experts that can verify or deny the actual operation of the lubrication of the differential?
I have seen many concerns about poor quality of the diff assembly, but the photos of the gear lube don't appear much different from any used lubricant from conventional LSDs that use clutch packs. (Again, not including Torsen type diffs).
Last edited by nkostoff; Jan 29, 2024 at 04:44 PM. Reason: Prior incomplete message
