Opinions on racingdiffs.com

[sddynamix]

Had my local diff shop rebuild my diff using their GKN clutch pack kit. Worked great!

[enjoy_m3]

sddynamix, did you get the v1 or v2? Any track feedback?

[sddynamix]

sddynamix, did you get the v1 or v2? Any track feedback?

Must've been v1 - when I bought mine at the end of 2018 there was only one type. I did 4.10's at the same time and I've only auto-x'd a couple of times since, but car feels new!

[enjoy_m3]

Thanks! i just ordered the v2,it actually is getting here in about 5 days, pretty quick.

[maupineda]

Thanks! i just ordered the v2,it actually is getting here in about 5 days, pretty quick.

Are you doing this as a DIY, or do you have diff builder?

[enjoy_m3]

I was debating whether to have a shop do it. racing diffs has a video on how to do it. I ended it up taking it apart myself. You can do it your self but would be much easier if you have a large bench vise and a work table.

[EZE]

I contacted them last week and the v2 is for cars that aer post 2005 and more complex to rebuild. Also backlash does not have to be redone unless swapping out lsd units or changing gear ratio. I ordered the advanced V1 kit today and a 3.91 gear and pinion to get rebuilt at a local shop. He was going to make a viedo on setting lash before Covid but hadn't had time.

[maupineda]

I was debating whether to have a shop do it. racing diffs has a video on how to do it. I ended it up taking it apart myself. You can do it your self but would be much easier if you have a large bench vise and a work table.

thanks, I am struggling to find a shop I can trust for the rebuild. I am sure I can do it myself, the issue is getting hold of the press and vice required for assembly and setup.

[enjoy_m3]

Harbor freight for both. If you have you swap the gears, I'd take it to a differential shop if you're not familiar with setting backlash yourself.

[Arith2]

Ordered my kit last night. The description says V1 is for E46 M3s and the V2 is for the E90s and E60s I think. So, we would want V1. I got their advanced kit for like $450 shipped. Can't argue with that. Once I recieve it I'll take some pictures of the stuff. Then once I install it, we'll see how it does. I'll be doing it a BMW dealership so I'll have a few guys who will be able to help me if I need it. I'll look for the manual if I can find it. Hopefully they have special tools to make my life easier. Taking a grinder to bearings always bothered me.

[Mspir3d]

Ive been researching this a lot lately. My lsd takes a while to lock up. I figured while I have the differential out I may as well upgrade to a 3.91. Looking at diffsonline I can’t justify the cost but racingdiffs I feel better about it if the parts are quality. The best price I’ve seen on the 3.91 ring and pinion is 864 soo far. I’ll probably pull the trigger on the v1 advanced soon. For the cost of the vice and press from harbor freight, I can have it rebuilt by a local shop that does a lot of diffs so I’m a little torn on doing it myself.

[Gt4]

I worked on my diff today, I was supposed to only change seals and o-rings but ended up ordering Racingdiffs advanced pack v1 and I will install a spare 4.10 pinion/ring I had for a while to replace my 3.91 finally.

For anybody wondering, I tought my 2005 & my 2006 would share the same GKN LSD as a Z4M but in my 2005 I really have 8 plates and 7 clutches like RacingDiffs mention in pack v1.

[maupineda]

I worked on my diff today, I was supposed to only change seals and o-rings but ended up ordering Racingdiffs advanced pack v1 and I will install a spare 4.10 pinion/ring I had for a while to replace my 3.91 finally.

For anybody wondering, I tought my 2005 & my 2006 would share the same GKN LSD as a Z4M but in my 2005 I really have 8 plates and 7 clutches like RacingDiffs mention in pack v1.

I think it is very few E46 M3 who got the Gen2 GKN. the core is different and is the same used on E9x M3, E6x M5 and Z4M.

The Gen2 cracks open from the opposite side, and needs a special tool. Gen1 opens from the ring side

[Gt4]

I think it is very few E46 M3 who got the Gen2 GKN. the core is different and is the same used on E9x M3, E6x M5 and Z4M.

The Gen2 cracks open from the opposite side, and needs a special tool. Gen1 opens from the ring side

Good to know! My 2006/04 is probably a Gen2 than.

I opened my Z4M Coupe diff to swap a 4.10pinion/ring in it back in the days but didn’t pay attention to the LSD cause didn’t had to open it. I remember it had bigger opening like this one and it was easier to see the clutches vs a Gen1.

[maupineda]

Good to know! My 2006/04 is probably a Gen2 than.

I opened my Z4M Coupe diff to swap a 4.10pinion/ring in it back in the days but didn’t pay attention to the LSD cause didn’t had to open it. I remember it had bigger opening like this one and it was easier to see the clutches vs a Gen1.

How did you like the 4.1 on the Z4M. I am about to buy one but the gear set is on back order at the moment. I cam do a 3.91 but don’t want to jump the gun as some say is not enough of a change over the 3.62