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<img src="https://lh4.googleusercontent.com/-_X3JiiKj97Q/UJ08zbIlAZI/AAAAAAAAAQM/RnwGxOFy2sY/s1024/slide.001.jpg"

<img src="https://lh6.googleusercontent.com/-QcvkGw3kt20/UJ081GAINXI/AAAAAAAAAQU/41hWaAHx29Y/s1024/slide.002.jpg"

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<img src="https://lh6.googleusercontent.com/-XEVt5VobFoc/UJ084hx2NdI/AAAAAAAAAQk/CFo5ameez1I/s1024/slide.004.jpg"

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<img src="https://lh5.googleusercontent.com/-9WhunXtGzRU/UJ09AzIch0I/AAAAAAAAARM/kfGoNtq7Fqk/s1024/slide.009.jpg"
 

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i struck my flange with a chisel to permanently mark where it goes. I turned the chisel sideways so it hit the flange rim, shim, and case all at the same time. I guess the oil port orientation is obviously important but i admit i did it originally so i didnt mix up the shims l to r.

one mark on one side of the diff, two on the otherside so i wont confuse which pieces go where. Its very important to keep the flanges, shims, and which side they came from well organized so you can put every back exactly they way you found it to prevent messing with the gear spacing inside the unit.


o btw i also did this with a wood chisel and not a cold steel chizel because the wood chisel is sharper so i could strike it lighter and less deep. Really didnt do too much more than mark into the black paint
 

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Great write-up. This is on my winter to-do list.
 

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what are all the part numbers that we need for this? i am thinking of doing it myself since best price i got from a indy was $400 to do both sides
 

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Excellent pictures/diagramming. Added to DIY sticky. OP, please advise if you want different keywords applied.
Parts diagram is here.
 

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Solely because I am currently installing my new diff as I type this, I should note that there is a discrepancy between this DIY and Raikku's with respect to the tightening torque for the E14 reverse torx bolts on the output shafts. This DIY says 100 ft. Lbs, which is a lot! That's close to the 110 ft. lbs. (150 NM) torque to be applied to the front differential bolt! Raikku's DIY says 83 NM, which converts to about 62 ft. Lbs. Big difference. I'm running with the lower torque value.

--Peter
 

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I used the higher torque rate because taking them felt like 100lbs lol I had to use a big breaker bar
 

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Solely because I am currently installing my new diff as I type this, I should note that there is a discrepancy between this DIY and Raikku's with respect to the tightening torque for the E14 reverse torx bolts on the output shafts. This DIY says 100 ft. Lbs, which is a lot! That's close to the 110 ft. lbs. (150 NM) torque to be applied to the front differential bolt! Raikku's DIY says 83 NM, which converts to about 62 ft. Lbs. Big difference. I'm running with the lower torque value.

--Peter
Great DIY but I'd have to agree with Peter. 100 ft/lbs is a lot on an M12 bolt. I've removed at least a dozen factory torqued diffs and none were that tight.
 
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I'm having problems moving the output shaft out of the way enough so I can pull out the shaft mount and shaft flange. There's still some overlap between them. Just like in the pictures above.

I'm doing the passenger side first. Got the car on 4 jack stands. Should I raise the wheel to get more clearance? don't want to drop the dif if I don't have to.

Mark
 

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I'm having problems moving the output shaft out of the way enough so I can pull out the shaft mount and shaft flange. There's still some overlap between them. Just like in the pictures above.

I'm doing the passenger side first. Got the car on 4 jack stands. Should I raise the wheel to get more clearance? don't want to drop the dif if I don't have to.

Mark
Get a jack and start lifting the wheel slowly. It will give you all the space you need .
 

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Discussion Starter #12
It can definitely be done.....I loosened the exhaust in the middle and rear supports and then I used rubber bungees to hold the shaft forward and out of the way....the exhaust was only an issue for me on driver's side.....whatever you do, do NOT drive in new seals all the way to flange.......only enough to seat flush.....like 1 cm.....the drain hole on the inside of the seal housing should not be covered by the seal
 

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Yes, that worked. Jacked up the wheel and that gave me enough clearance to remove diff flange and mount. I also replaced the two dust covers on the diff flange and the big oring on the diff mount.
 

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tripevans,

I changed the seals on the diff but is leaking like crazy, for sure I know I drove the seals all the way to flange, so there one of the issues I have but the other I have is the my oil passage was seating the opposite way. I have 2003 m5, could it be different position for 2000 and 2003. So I will be replacing the seals again tonight, but not sure about the oil passage position.

Also how do you know the seals are seating flush and even and on the right position on. not too far in or not too far out.
 

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Discussion Starter #17
Lanza360,
Been there.....when u drive in the seal make it as level as possible and only drive in enough that the entire perimeter of the seal is contacting the housing....make sure u can still see oil weep hole and that u didn't cover it with seal...doesn't have to be perfect or in all the way....b/c when u insert the output shaft flange through the seal it will drive it flush and to the appropriate depth as the lock ring snaps into place on the output shaft flange gear splines....won't leak one drop....let me know how it turns out man
 

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Lanza360,
Been there.....when u drive in the seal make it as level as possible and only drive in enough that the entire perimeter of the seal is contacting the housing....make sure u can still see oil weep hole and that u didn't cover it with seal...doesn't have to be perfect or in all the way....b/c when u insert the output shaft flange through the seal it will drive it flush and to the appropriate depth as the lock ring snaps into place on the output shaft flange gear splines....won't leak one drop....let me know how it turns out man
Tripevans,

Thanks for the quick response but after ruining 4 seals, decided to purchase the special tool for it, anyhow I will let you know once I put it together and take it for a test drive.
 
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