[scoopdawoop]

Im looking to do an M3 diff set up.

For cutting and welding a custom driveshaft, from what I read everyone has to take their own measurements on their car as it varies.

Does this mean if I buy an already made set up from someone else's car, there's a chance it won't fit?

maybe there's something i'm missing, because I don't really understand how it can vary.

Also i'm mainly wanting the LSD to be able to drift. Just street drifting in the mountains, nothing competitive. im open to other diffs. anyone have experience with the various diff options and which is the best for drifting/daily? need something consistent, I wanna be able to pop a quick u turn without it opening up lol.

[SlowE92]

Originally Posted by scoopdawoop

Im looking to do an M3 diff set up.

For cutting and welding a custom driveshaft, from what I read everyone has to take their own measurements on their car as it varies.

Does this mean if I buy an already made set up from someone else's car, there's a chance it won't fit?

maybe there's something i'm missing, because I don't really understand how it can vary.

Also i'm mainly wanting the LSD to be able to drift. Just street drifting in the mountains, nothing competitive. im open to other diffs. anyone have experience with the various diff options and which is the best for drifting/daily? need something consistent, I wanna be able to pop a quick u turn without it opening up lol.

It varies depending on the year the car was built. For earlier models the diff was bolted, and later models they were welded. I know the earlier 07 models you can bolt on and go. Anything post 07 you have to weld. But yes given the welding patterns there is a chance that it might not fit and so you would have to go in and re weld it. I have the ER wavetrac diff, a lot of people go with Qaife and Mfactory but to each their own. I have a ST 6973 and my wavetrac has held up really well.

[LMB335IS]

There's 3 different lengths depending on transmission, manual, auto, DCT. The section from the center support back to the diff is the same length regardless of the driveshaft and diff used, it's the front section that is shortened with a M3 diff swap. If you buy one already modded make sure it came from a car with the same tranny as yours. There's enough play that they'll fit despite any small variation in tolerances between vehicles.

[scoopdawoop]

Originally Posted by SlowE92

It varies depending on the year the car was built. For earlier models the diff was bolted, and later models they were welded. I know the earlier 07 models you can bolt on and go. Anything post 07 you have to weld. But yes given the welding patterns there is a chance that it might not fit and so you would have to go in and re weld it. I have the ER wavetrac diff, a lot of people go with Qaife and Mfactory but to each their own. I have a ST 6973 and my wavetrac has held up really well.

yeah mines welded unfortunately. are you just using stock axles then? i think the aftermarket diffs are probably better but i do like the idea of the beefier m3 axles for drifting.

[scoopdawoop]

Originally Posted by LMB335IS

There's 3 different lengths depending on transmission, manual, auto, DCT. The section from the center support back to the diff is the same length regardless of the driveshaft and diff used, it's the front section that is shortened with a M3 diff swap. If you buy one already modded make sure it came from a car with the same tranny as yours. There's enough play that they'll fit despite any small variation in tolerances between vehicles.

thank you, that makes sense !

[SlowE92]

Originally Posted by scoopdawoop

yeah mines welded unfortunately. are you just using stock axles then? i think the aftermarket diffs are probably better but i do like the idea of the beefier m3 axles for drifting.

No i snapped one of the stock axles and upgraded to the Mfactory. If youre an avid drifter or making over 600 wtq then by all means upgrade them, but the stock axles are pretty strong.