Differential Swap Question (E39 M5 LSD)

bigjae1976 · 02-13-2022, 11:48 AM

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by bigjae1976

Scharbag What's up? Glad you took the dive and did this. Rebuilding the LSD isn't too bad at all! Just gotta stay organized.

I've since swapped my R&P to a 3.91. I opened the LSD to check out the internals, everything looked really good after a year of track abuse. I do lean on the diff and slide the rear axle a bit. I reassembled the LSD pumpkin and the top cap wouldn't sit flush. Like an idiot, I pinched one of the spider gear lash shims (smaller rings that fit inside of the clutches/steels). Ugh...can't buy them so I had to have a machine shop make some.

I'm subbing to get your feedback on the 50/65 ramps. I'd like to do 30/60 but the car still feels great with the 45/45.

Quote:

Originally Posted by Bakerboy

I have E92 m3

The donor diff is sourced from a e36 m3 evo

I'm wondering if I just need to get a hold of some 5 series halfshafts (input shafts)

equal length stubs from an 210mm diff will fit. So if your E36 diff came with the axle stubs...those are the ones.

Definitely not the right ones mate

I think I need ones from e39 m5 or any 102 equal length flanges

The bolt size is incorrect on the e36 variant and is a slightly different size/shape

My stubs were off an E24 633CSi. Stubs from an older V8 5/6/7 series should work - large case open or LSD. You can ID a 210mm case by the number of bolts on the output flange.

8 = 210mm
6 = 188mm
4 = 168mm

Generally speaking…

Options are:
E24
E28
E34
E32

Or any M5 E39 or earlier but you're going to pay more.

I think an E28 535 might work.

Or you can take 2 long stubs and machine them to equal lengths. Follow the OS Giken instructions.

Bakerboy · 02-13-2022, 02:03 PM

Quote:

Originally Posted by bigjae1976

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by bigjae1976

Scharbag What's up? Glad you took the dive and did this. Rebuilding the LSD isn't too bad at all! Just gotta stay organized.

I've since swapped my R&P to a 3.91. I opened the LSD to check out the internals, everything looked really good after a year of track abuse. I do lean on the diff and slide the rear axle a bit. I reassembled the LSD pumpkin and the top cap wouldn't sit flush. Like an idiot, I pinched one of the spider gear lash shims (smaller rings that fit inside of the clutches/steels). Ugh...can't buy them so I had to have a machine shop make some.

I'm subbing to get your feedback on the 50/65 ramps. I'd like to do 30/60 but the car still feels great with the 45/45.

Quote:

Originally Posted by Bakerboy

I have E92 m3

The donor diff is sourced from a e36 m3 evo

I'm wondering if I just need to get a hold of some 5 series halfshafts (input shafts)

equal length stubs from an 210mm diff will fit. So if your E36 diff came with the axle stubs...those are the ones.

Definitely not the right ones mate

I think I need ones from e39 m5 or any 102 equal length flanges

The bolt size is incorrect on the e36 variant and is a slightly different size/shape

My stubs were off an E24 633CSi. Stubs from an older V8 5/6/7 series should work - large case open or LSD. You can ID a 210mm case by the number of bolts on the output flange.

8 = 210mm
6 = 188mm
4 = 168mm

Generally speaking…

Options are:
E24
E28
E34
E32

Or any M5 E39 or earlier but you're going to pay more.

I think an E28 535 might work.

Or you can take 2 long stubs and machine them to equal lengths. Follow the OS Giken instructions.

Yeah it's defo 210mm and the Lsd unit

It's just the output shafts won't work with e9x driveshafts

After research I think I have: 33131214087

But need: 33131214068

The hunt for more parts continue haha

Bakerboy · 03-22-2022, 05:36 PM

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Put the 4 clutches in today. Some figure 8s in a parking lot and then a quick rip. Felt pretty good. Quick lockup on acceleration but not too much understeer. Running 50/65 ramps. I will check the preload once it is broken in.

Blue Motul 75w140 is strange to work with. I could only think of smurfs...

Anymore feedback on how it feels?

Mine still on the bench in the garage

Unfortunately we got some snow. So, not a lot of miles on it yet.

I will report back as soon as I can.

Cheers,

Got a quick question mate

I've just dropped the e92 dct diff and can see that the bolts for the diff input shafts are a different size than the donor lsd diff (where the main driveshafts bolt to the halfshafts) thicker on the e92

From my understanding I will need to use the halfshafts from the donor on my e92 one

Did you face this issue, if so how did you overcome, redrilling and tapping or using spacers with older style bolts?

What kind of car are you working on? An M3 or 335is?

I have E92 m3

The donor diff is sourced from a e36 m3 evo

I'm wondering if I just need to get a hold of some 5 series halfshafts (input shafts)

Ahh. Not sure exactly what you need but the E39 M5 output flanges bolt to the E9x M3 half shafts just fine. I did not have to modify anything to make my setup work.

Cheers,

Hello mate

What mm spec each side was the spacers to make the lsd line up for back lash and final drive engagement?

Also how you finding lsd since change to stage 3?

Scharbag · 03-23-2022, 08:12 AM

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Put the 4 clutches in today. Some figure 8s in a parking lot and then a quick rip. Felt pretty good. Quick lockup on acceleration but not too much understeer. Running 50/65 ramps. I will check the preload once it is broken in.

Blue Motul 75w140 is strange to work with. I could only think of smurfs...

Anymore feedback on how it feels?

Mine still on the bench in the garage

Unfortunately we got some snow. So, not a lot of miles on it yet.

I will report back as soon as I can.

Cheers,

Got a quick question mate

I've just dropped the e92 dct diff and can see that the bolts for the diff input shafts are a different size than the donor lsd diff (where the main driveshafts bolt to the halfshafts) thicker on the e92

From my understanding I will need to use the halfshafts from the donor on my e92 one

Did you face this issue, if so how did you overcome, redrilling and tapping or using spacers with older style bolts?

What kind of car are you working on? An M3 or 335is?

I have E92 m3

The donor diff is sourced from a e36 m3 evo

I'm wondering if I just need to get a hold of some 5 series halfshafts (input shafts)

Ahh. Not sure exactly what you need but the E39 M5 output flanges bolt to the E9x M3 half shafts just fine. I did not have to modify anything to make my setup work.

Cheers,

Hello mate

What mm spec each side was the spacers to make the lsd line up for back lash and final drive engagement?

Also how you finding lsd since change to stage 3?

The side shims need to be chosen base on your pumpkin and carrier during assembly.

The 4 clutch setup works great. I find it has even smoother lockup under throttle. The ZF LSD is awesome compared to the factory M-Variable. You will love it once you get it installed.

Bakerboy · 03-30-2022, 04:55 PM

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Quote:

Originally Posted by Bakerboy

Quote:

Originally Posted by Scharbag

Put the 4 clutches in today. Some figure 8s in a parking lot and then a quick rip. Felt pretty good. Quick lockup on acceleration but not too much understeer. Running 50/65 ramps. I will check the preload once it is broken in.

Blue Motul 75w140 is strange to work with. I could only think of smurfs...

Anymore feedback on how it feels?

Mine still on the bench in the garage

Unfortunately we got some snow. So, not a lot of miles on it yet.

I will report back as soon as I can.

Cheers,

Got a quick question mate

I've just dropped the e92 dct diff and can see that the bolts for the diff input shafts are a different size than the donor lsd diff (where the main driveshafts bolt to the halfshafts) thicker on the e92

From my understanding I will need to use the halfshafts from the donor on my e92 one

Did you face this issue, if so how did you overcome, redrilling and tapping or using spacers with older style bolts?

What kind of car are you working on? An M3 or 335is?

I have E92 m3

The donor diff is sourced from a e36 m3 evo

I'm wondering if I just need to get a hold of some 5 series halfshafts (input shafts)

Ahh. Not sure exactly what you need but the E39 M5 output flanges bolt to the E9x M3 half shafts just fine. I did not have to modify anything to make my setup work.

Cheers,

Hello mate

What mm spec each side was the spacers to make the lsd line up for back lash and final drive engagement?

Also how you finding lsd since change to stage 3?

The side shims need to be chosen base on your pumpkin and carrier during assembly.

The 4 clutch setup works great. I find it has even smoother lockup under throttle. The ZF LSD is awesome compared to the factory M-Variable. You will love it once you get it installed.

I'm nearly there with the build now

Changing the large pinion bearing was the worst pain so far.

Horrid to get the bearing cone out then getting new one in took freezing the new cone for few hours and blow torching the case to get it to press in.

The lsd core is built but not sealed yet. Im thinking of trying the middle setting 30/60, or do you think I might find it harsh.

How is it for you at 50/65?