G250 and 3.25LSD instal

[benz-tech]

I have finally completed my driveline upgrade to go along with my M44 Frankenmotor. If you HATE the huge gap from first to second gear on the 240's, I highly recommend this swap. I will outline a few things needed to do it.
You need the cut the shift rod and shorten it. The way I did it was to cut it too short, run an 12x1.5 tap into each end and then screwed all thread in. This allowed me to test-fit it few times and after  I adjusted to the correct length I then welded it together.

The e30 alum shift base works perfectly.

I loosened the driveshaft nut and slid it all the way together, moved the center support all the way back and has a few mm of play overall in the driveshaft length. It works but just barely, and I have no noises or vibrations after 3 months or so (3k mi)

You have to use the g250 slave cyl. 

With a 3.25 out back, it feels like it has the perfect ratios to me. Granted my eng has more torque than a standard m42.
Hope this helps anyone considering an e36 m42 or m44 swap. Just use the gearbox too!  You will love the close-ratio, I promise. You can test drive mine if your in the Sacramento area to try it out.

[1998ccc]

Which flex disk / output flange did you use?  I'd read somewhere the bolt sizes are different between the 240 flange and the 250???

[benz-tech]

I used the stock e30 guibo. It bolted right up. The 250 I used was from a 4-cyl car if that matters.

[1998ccc]

What did you use for tranny cross member / mounts?  Any shims / cutting welding etc?

I have a 250 and a 3.25:1 sitting around.  You've got me thinking.

[benz-tech]

The crossmember and mounts are are stock e30 units. In their genius, BMW  made the mounting studs for the crossmember slide in the body so they just slide back an inch or so. The only thing I welded was when I put the shift rod back together.

[fastjack]

I have a z3 sd-250G tranny in my garage.maybe someday,but I have a 4.10LSD and a 4.27LSD waiting to go in