Originally Posted By: MrHorspwer
Originally Posted By: gathermewool
I don't understand why they call for GL-4 MTF in a clutch-pack rear limited-slip rear diff.
I would think a GL-5 gear lube with limited slip additive would make a lot more sense. I'm sure I'm missing something.
There are two separate fluids in rear axle. One fluid lives with the hypoid gearset and lubricates it, along with all the bearings and the rest of the typical axle components. This fluid spec’d here is a regular synthetic 75W90 GL5.
The other lives within the clutch pack, which is separate from the axle lube described above. The purpose of the fluid is to line the clutch pack and control the lockup characteristics of the clutch. Since there is no hypoid gearset, a GL5 fluid and it’s extreme pressure additives aren’t required. The really important part of this fluid is the additive pack and the friction modifiers.
The 88863349 fluid is specific to the Haldex clutch. It’s not the typical GL4 manual transmission fluid. Honestly, I’ve never seen it in the black Delco bottle that was posted above. I’ve only seen it in a silver cylindrical bottle with a prominent “Made in Sweden” sticker on it and German translations on the label. Saab was a prominent user of this fluid when they rolled out the Haldex XWD system.
My advice: Use whatever you like for the axle, but the 88863349 fluid is quite specific for the Haldex. I don’t think you’ll find an appropriate alternative.
Had to google srx haldex to show the two seperate parts of the rear end.