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#4630859 - 01/10/18 07:48 PM Had to service a Cadillac SRX rear diff today...
14Accent Offline


Registered: 08/03/17
Posts: 392
Loc: MN
Looked up the fluid... There's 2 on this unit. It's a Haldex supplied clutch pack system, almost identical to what's used in Saab, Ford, and Volvo.

The fluid for the differential clutch pack, GM part #88863349, was almost $64 a quart, my price! I've seen some insanely priced fluid, but c'mon. It says right on the bottle that it's just 75w90. What could be so special about this stuff?


Edited by 14Accent (01/10/18 07:49 PM)
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#4630868 - 01/10/18 08:04 PM Re: Had to service a Cadillac SRX rear diff today... [Re: 14Accent]
jhellwig Offline


Registered: 07/01/13
Posts: 1541
Loc: Ottumwa, Iowa
The fact that it is a gl4 multigrade.
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#4630897 - 01/10/18 08:40 PM Re: Had to service a Cadillac SRX rear diff today... [Re: 14Accent]
Danh Offline


Registered: 10/16/10
Posts: 1750
Loc: .
Motorcraft full-syn 75w90 GL4 equivalent retials for half the price.

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#4630916 - 01/10/18 08:58 PM Re: Had to service a Cadillac SRX rear diff today... [Re: 14Accent]
SavagePatch Offline


Registered: 05/06/15
Posts: 571
Loc: California
Dang! That's a steep price.

Perhaps Redline MT90 would suffice?

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#4630948 - 01/10/18 09:52 PM Re: Had to service a Cadillac SRX rear diff today... [Re: 14Accent]
Marco620 Offline


Registered: 02/25/14
Posts: 2186
Loc: Deplorable Kansan,HK fan!
Call Dave at Redline Oil. He can get you better for way less with a better fluid. GM just trying to rip people to save their Union bailout.
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#4630961 - 01/10/18 10:04 PM Re: Had to service a Cadillac SRX rear diff today... [Re: Marco620]
clinebarger Offline


Registered: 12/19/13
Posts: 1912
Loc: Fort Worth, Texas
Originally Posted By: Marco620
GM just trying to rip people to save their Union bailout.


Yep, GM is the only manufacturer to ever overcharge for fluids!
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#4630980 - 01/10/18 11:02 PM Re: Had to service a Cadillac SRX rear diff today... [Re: 14Accent]
gathermewool Offline


Registered: 01/09/09
Posts: 5987
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.

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#4631023 - 01/11/18 02:56 AM Re: Had to service a Cadillac SRX rear diff today... [Re: 14Accent]
das_peikko Online   content


Registered: 01/01/18
Posts: 515
Loc: San Antonio, TX
What year was the Cadillac? I'm curious to know if it has the differential pump that's $400 to replace.

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#4631058 - 01/11/18 05:44 AM Re: Had to service a Cadillac SRX rear diff today... [Re: clinebarger]
SR5 Offline


Registered: 07/07/15
Posts: 4465
Loc: Down Under
Originally Posted By: clinebarger
Originally Posted By: Marco620
GM just trying to rip people to save their Union bailout.


Yep, GM is the only manufacturer to ever overcharge for fluids!


Yeah, try owning an Audi.
I had one of those, with it's special purple coolant and special PS fluid.

My next car was a GM.
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#4631107 - 01/11/18 07:12 AM Re: Had to service a Cadillac SRX rear diff today... [Re: gathermewool]
MrHorspwer Offline


Registered: 12/18/06
Posts: 1422
Loc: Michigan
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 specíd 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 itís extreme pressure additives arenít 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. Itís not the typical GL4 manual transmission fluid. Honestly, Iíve never seen it in the black Delco bottle that was posted above. Iíve only seen it in a silver cylindrical bottle with a prominent ďMade in SwedenĒ 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 donít think youíll find an appropriate alternative.

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#4631250 - 01/11/18 10:00 AM Re: Had to service a Cadillac SRX rear diff today... [Re: 14Accent]
meep Online   content


Registered: 02/20/07
Posts: 3557
Loc: Southeast
^^^ this ^^^. you do not want to monkey around with the fluid for the haldex components. If this is the same unit used in those europeans, it is hard on fluid. aside from a suggested aggressive service interval on this, a substitute won't only behave differently, but could also lead to early clutch failure.
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#4631529 - 01/11/18 01:59 PM Re: Had to service a Cadillac SRX rear diff today... [Re: MrHorspwer]
Kibitoshin Offline


Registered: 04/19/16
Posts: 693
Loc: Kaiōshinkai
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 specíd 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 itís extreme pressure additives arenít 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. Itís not the typical GL4 manual transmission fluid. Honestly, Iíve never seen it in the black Delco bottle that was posted above. Iíve only seen it in a silver cylindrical bottle with a prominent ďMade in SwedenĒ 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 donít think youíll find an appropriate alternative.


Had to google srx haldex to show the two seperate parts of the rear end.

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#4631533 - 01/11/18 02:02 PM Re: Had to service a Cadillac SRX rear diff today... [Re: MrHorspwer]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
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 specíd 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 itís extreme pressure additives arenít 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. Itís not the typical GL4 manual transmission fluid. Honestly, Iíve never seen it in the black Delco bottle that was posted above. Iíve only seen it in a silver cylindrical bottle with a prominent ďMade in SwedenĒ 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 donít think youíll find an appropriate alternative.


Exactly. Just like the rear diffs on Acuras. Use the wrong fluid and the clutch packs will be jumping/binding every time you take a corner. But most of ours have a separate clutch pack on each axle side that are operated independently, not just one for the whole diff.

The GM stuff is still a [censored] of a lot cheaper than the BMW AWD unit fluid my old E90 used. Worst part about that was the unit used 0.6L, and they sold it in 1.0L amounts. Doh!


Edited by mightymousetech (01/11/18 02:11 PM)
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#4631643 - 01/11/18 04:27 PM Re: Had to service a Cadillac SRX rear diff today... [Re: mightymousetech]
MrHorspwer Offline


Registered: 12/18/06
Posts: 1422
Loc: Michigan
Originally Posted By: mightymousetech
But most of ours have a separate clutch pack on each axle side that are operated independently, not just one for the whole diff.


If you look at the cutaway photo above, you can see the two clutch packs. The one at the differential input (where the prop shaft would attach) is the "whole diff" clutch that controls power flow into the rear differential.

On the side of the input clutch pack is the clutch pump. There are two hydraulic lines that exit and go up and over the differential, into a clutch pack on the output side (where an axle shaft would bolt to). This clutch pack is the "eLSD" that controls power flow between the left and right rear wheels.

GM introduced this system with Haldex on Saabs (just before they were shut down, unfortunately). It also received use on the Cadillac SRX (twin to the Saab 9-4x) and numerous Epsilon platform vehicles (Opel Insignia, Buick Regal and Lacrosse, and Cadillac XTS). I believe the XTS is the last remaining vehicle still using this system. Most new GM's use an AWD system from GKN.

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#4631660 - 01/11/18 04:47 PM Re: Had to service a Cadillac SRX rear diff today... [Re: MrHorspwer]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Originally Posted By: MrHorspwer
Originally Posted By: mightymousetech
But most of ours have a separate clutch pack on each axle side that are operated independently, not just one for the whole diff.


If you look at the cutaway photo above, you can see the two clutch packs. The one at the differential input (where the prop shaft would attach) is the "whole diff" clutch that controls power flow into the rear differential.

On the side of the input clutch pack is the clutch pump. There are two hydraulic lines that exit and go up and over the differential, into a clutch pack on the output side (where an axle shaft would bolt to). This clutch pack is the "eLSD" that controls power flow between the left and right rear wheels.

GM introduced this system with Haldex on Saabs (just before they were shut down, unfortunately). It also received use on the Cadillac SRX (twin to the Saab 9-4x) and numerous Epsilon platform vehicles (Opel Insignia, Buick Regal and Lacrosse, and Cadillac XTS). I believe the XTS is the last remaining vehicle still using this system. Most new GM's use an AWD system from GKN.


Thank you!
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