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Getting ready to swap out the differential fluid on my 2017 Grand Sport and was watching some videos on it and came across this one. The guy says the car has 2... the standard traditional one that takes gear oil and the eLSD that takes ATF. He only shows the regular one in the video. Anyone know what he's talking about?
I believe that all the differentials uses regular gear oil.
The differentials that have eLSD use ATF (?) in the eLSD unit itself.
In other words, two different fluids for eLDS differentials, they require two different lubricants because there are two different systems (gear oil for differential and ATF for the eLSD) and only gear oil for the standard differential because there is no eLDS option on it. Matter of fact all differentials use gear oil and only if you have the option of eLSD, the eLSD unit will use ATF.
The eLSD unit requires ATF.
The differential requires gear oil.
Not enough coffee too early in the morning.
Last edited by Tinkertech; Mar 13, 2026 at 08:31 AM.
There is one set of gears in the differential that run in gear oil with limited slip additive (additive is already in GM gear oil). The gear oil can be changed periodically.
The base Stingray has what used to be called Positraction which is a set of mechanical clutches to partially lock the left and right half shafts together so both wheels turn when only one has traction.
The eLSD is still a geared mechanical differential, but the limited slip clutches are hydraulically adjusted and actuated and lock the half shafts more or less together based on road conditions, drive mode, etc. The hydraulic system typically requires no maintenance.
You don't change the hydraulic fluid. There seems to be a special fitting required to do it properly - mentioned in a recent thread where someone was rebuilding a wreck.
You don't change the hydraulic fluid. There seems to be a special fitting required to do it properly - mentioned in a recent thread where someone was rebuilding a wreck.
Here are the two procedures as presented in the FSM:
You really don't want to monkey with the eLSD Clutch fluid unless it has been disturbed. Otherwise, you will be looking for a GM MDI2 Scan Tool and making up a drain hose to drain the fluid.
2 different differentials?
