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Old 11-03-2023, 10:10 AM
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Rear Diff Parts List

I’ve finally embarked on a slow motion LSD upgrade to my rear diff. I’ve inadvertently gotten into some icy and muddy farm roads while bird hunting with the X5 that the DSC simulated LSD really struggled with. I’m very careful, especially when I’m in remote areas, but occasionally I have blundered onto a farm road that looked ok, but had me really worried that I was going to have to walk out.

I decided to go with a quaife helical design for a few reasons. They make one that actually fits the E53 3.6 rear diff (a big plus), by all accounts it’s bullet proof, it has excellent highway and around town manners (unlike a true mechanical locker), is relatively quiet, and is plug and play…no adjusting, special lube, etc. The drawbacks are that it isn’t the best off road LSD design and will still loose traction if both wheels have little or no traction. However, this can be overcome, apparently, by tapping the brakes to simulate traction. Therefore they tend to work well with DSC systems as well.

Since my X5 is a daily driver, I bought an EBay complete rear diff into which I will install the LSD, along with a full rebuild. I’ll swap it in when I’m done, or have my Indy do that bit. That way I can always swap the original diff back in if I don’t like it. To that end, I’ve been struggling to find part numbers for the bearings and some other bits and pieces. BMW wants to sell complete rebuilt diffs, not internal parts it would seem. However, the Quaife BMW distributor (Birds Automotive) in England was kind enough to drop the full parts list on me. Cut and paste below….I expect much of the below would work on the front diff too:
—————-
1x pinion seal (BMW part number 31507609535)
1x pinion crush tube (BMW 33121744368)
1x pinion securing plate (BMW 23211490120)
1x pinion bearing front (BMW 33121204312 or Timken HM88542/HM88510)
1x pinion bearing rear (Timken HM801349/HM801310)
2x output bearings (FAG F-801298). Or you can use a ball bearing style used on later models which is the same size (FAG F-234976)
And the last thing is 2x output seals but we supply those FOC with the Quaife.

We would normally order the pinion seal/tube/plate from BMW then order the bearings from someone like https://www.bearings-online.co.uk/
————————
I’ll post a write up when I get to this project. Hopeful before early January when I’ll be headed north again with my pups to chase birds.
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Original owner 2002 E53 X5 4.4i to 4.6i swap
2025 G06 X5 50e
Former
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1986 Saab 900S
1996 BMW Z3
1998 BMW E36 M3 Sedan
2004 BMW E46 M3
2006 Audi A3 Quatro
1993 Mopar 318 Jeep Grand Cherokee
2015 V6 Jeep Grand Cherokee

Last edited by Henn28; 11-04-2023 at 04:20 PM.
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  #2  
Old 01-11-2025, 12:34 AM
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Excellent post. The side bearings are so pricey though!
I purchased a locker from ecstunning and have a spare diff laying around, just need to get those bearings to put it together
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