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In reading the sticky on changing the fluid in my eLSD, there is some confusion regarding the correct product to use. A chart posted by a well known tech contributor says:
A later comment from the same person, in response to someone asking about a GS with the eLSD says:
Which would be this fluid, according to the same chart referenced:
I bought 3 quarts of the 88862624 from a member here who just sold a Z06. Can I use the 88862624? I can't find anything in the owners manual, but it does say that the automatic transmission fluid is "Dexron VI, which is the same name in the chart above for eLSD fill.
The eLSD consists of 2 parts, the mechanical differential gears, and a hydraulic system (control module, electric pump, and clutch actuator). The clutch forces the differential gears to lock, controlled from 0% to 100%, depending on what the car is doing.
The mechanical diff is lubricated with the 75w-90 Dexron LS Gear Oil, and the hydraulic system uses Dexron ATF fluid.
What you bought is correct for the diff gear portion. Most people only change the diff gear oil, rather than the ATF fluid, which needs a computer command to run the pump to bleed any air in the hydraulic system after the ATF fluid is changed. The gear oil should be changed at 500 miles, then again at 1500 miles, then every 25000 miles after. If you track the car, it should be changed after every track session. There are some cars that have an underfilled diff gear oil from the factory.
Last edited by ersatz928; Apr 25, 2020 at 11:10 PM.
In reading the sticky on changing the fluid in my eLSD, there is some confusion regarding the correct product to use. A chart posted by a well known tech contributor says:
A later comment from the same person, in response to someone asking about a GS with the eLSD says:
Which would be this fluid, according to the same chart referenced:
I bought 3 quarts of the 88862624 from a member here who just sold a Z06. Can I use the 88862624? I can't find anything in the owners manual, but it does say that the automatic transmission fluid is "Dexron VI, which is the same name in the chart above for eLSD fill.
Thanks again forum
The current C7 automatic transmission oil has changed to Mobil 1 Synthetic LV ATF HP fluid. It replaced the Dexron oil that was found to be too hygroscopic. The gear oil you list is current for the differential gear only. You can use the Mobil 1 trans oil in the eLSD. The Dexon LS gear oil you list is only for the differential and "not" for the eLSD.
Here is a YT video that discusses how to replace the rear differential oil that you have bought.
The grey goop on the magnetic plugs is fine metal particles (not silicone....) from the break-in of the diff gears, which is pretty normal for any new differential, but that's why you change it once or twice when the car is new, to get that out.
The easiest and least messy way to fill the diff and/or the trans is to buy a 1 gallon garden pump-spray bottle at Walmart ($8), unscrew and remove the spray tip. Then fill the spray bottle with all 3 quarts of the new fluid, pump the hand pump 6 to 10 times, and then the fluid will be pumped in when the wand trigger is pressed. Much easier and cleaner than those pumps that screw onto each bottle, which need a million pumps, and make an extra mess when you need to transfer the pump to the next quart bottle.
If the angle of the rigid spray wand won't reach into the fill hole, I have then cut off the spray tip, and press-fit on a short length of clear PCV hose (Home Depot), which then can be better maneuvered into an awkward fill hole, like on the C7 diff.
In order to not mix fluid types, I have one spray bottle dedicated for diff oil use, and another for transmission fluid. I just keep them in a labeled box for the next time I change my fluids.
I would suggest that everyone change their diff gear oil after the first 500 to 1000 miles, to remove the break-in metallic particles, which is normal for a new diff. For the C7, since many are underfilled at the factory, I would check the diff oil level at mile zero.
The car should be front-to-back level when draining and refilling the fluid.
Last edited by ersatz928; Apr 26, 2020 at 02:39 PM.
The grey goop on the magnetic plugs is fine metal particles (not silicone....) from the break-in of the diff gears, which is pretty normal for any new differential, but that's why you change it once or twice when the car is new, to get that out.
Do you have any idea where these Corvette differential are manufactured? They seem to be poorly designed or the quality control is just not there. I have a late model 19 GS and the vehicle already needs a new differential. Only have 10,000 miles on the car. Never really pushed the vehicle that hard. You read on the CF so many C7 Corvette owners have had numerous problems with their differentials. So many differentials have been replaced too. It's been 2 weeks now I've am still waiting and my Chevy dealer is unable to find a new C7 differential anywhere.
Yours was probably underfilled at the factory.
The eLSD and regular diff is from GM supplier Linamar, a division of McLaren Engineering...…(really???)
Designed in USA, manufactured in Canada.
Yours was probably underfilled at the factory.
The eLSD and regular diff is from GM supplier Linamar, a division of McLaren Engineering...…(really???)
Designed in USA, manufactured in Canada.
Thanks for passing along. Just have to wait and see how long it will take to get resolved. If they can't find a differential maybe soon I can contact Chevy Concierge here on the forum to expedite.
The eLSD consists of 2 parts, the mechanical differential gears, and a hydraulic system (control module, electric pump, and clutch actuator). The clutch forces the differential gears to lock, controlled from 0% to 100%, depending on what the car is doing.
The mechanical diff is lubricated with the 75w-90 Dexron LS Gear Oil, and the hydraulic system uses Dexron ATF fluid.
What you bought is correct for the diff gear portion. Most people only change the diff gear oil, rather than the ATF fluid, which needs a computer command to run the pump to bleed any air in the hydraulic system after the ATF fluid is changed. The gear oil should be changed at 500 miles, then again at 1500 miles, then every 25000 miles after. If you track the car, it should be changed after every track session. There are some cars that have an underfilled diff gear oil from the factory.
Per the OM you don't need to change rear diff gear oil that often. Change it at 45K mile intervals if the vehicle is only driven on the street. If the vehicle is going to be used on a road course the fluid temperatures will get much higher so the driver needs to change the fluid after the first track event and then after every 24 hours of track usage. For me that works out to about once per year.
Yours was probably underfilled at the factory.
The eLSD and regular diff is from GM supplier Linamar, a division of McLaren Engineering...…(really???)
Designed in USA, manufactured in Canada.
Who cares who owns who.....Linamar clearly has some design and/or quality control issues......underfilled lubricants, warble noise issues (bearings? ring to pinion alignment?)
Last edited by ersatz928; Apr 29, 2020 at 07:08 PM.
Who cares who owns who.....Linamar clearly has some design and/or quality control issues......underfilled lubricants, warble noise issues (bearings? ring to pinion alignment?)
Seems like working for Linamar is not the best place to work. Seems they have some internal work culture issues working there. Take a look as these emploee reviews from people who have worked at Linamar.
Who cares who owns who.....Linamar clearly has some design and/or quality control issues......underfilled lubricants, warble noise issues (bearings? ring to pinion alignment?)
Because if you don't nip this in the bud quickly, you'll have people saying their car has the same parts as a 720S before long.
If you want to be that way, then why bother bringing this up at all? The car has been out of production for close to 6 months now. It doesn't matter who made it or what their procedures were. Virtually every C7 is a used car now. Just fix it and move on.
I don't think so, the C8 rear diff is integrated into the DCT transaxle case, so it is part of Tremecs design and manufacturing responsibility.
I suspect that C8 DCT problems will make C7 diff issues look minor.....
Last edited by ersatz928; Apr 30, 2020 at 04:59 PM.
I don't think so, the C8 rear diff is integrated into the DCT transaxle case, so it is part of Tremecs design and manufacturing responsibility.
I suspect that C8 DCT problems will make C7 diff issues look minor.....
Time will tell....but many manufacturers have designed and released DCTs.....and pretty much all of them have problems for the first 3 to 6 years of production...…...Audi, VW, Porsche, Ford, Getrag, ZF, Luk, Eaton......and now Tremec for the C8.
hi, so is there a need to change eLSD fluid and if so how often? it is not in the maintenance schedule table, nor described on the page after.
I am about to change rear axle fluid nearing 45k miles now on my 2017 GS Z07. I don't track the car.
hi, so is there a need to change eLSD fluid and if so how often? it is not in the maintenance schedule table, nor described on the page after.
I am about to change rear axle fluid nearing 45k miles now on my 2017 GS Z07. I don't track the car.
The short answer is no. The longer answer is I was told that's a dealer-only service item/process when I changed my rear diff fluid last year.
eLSD fluid change
