Hello. I just swapped the 3.7 diff from a g37 6mt into my 04 g35 5at. (Full pumpkin)
The diff I currently had was an open diff I believe since it wasn't a sport trim which has the lsd to my knowledge.
The flanges matched and it was a direct plug and play and perfect fit, but the issue is with either my abs(?) or vehicle speed sensor(?). My car currently has one plug for the pumpkin whereas the new diff has two plugs that are made for each sensor I'm assuming? I have a friend who also did a full pumpkin swap but his car already had lsd(2 plugs) so he faced no problems.
This is all according to my mechanic and some research and I'm so confused. Any input would be appreciated. Thanks.

So all in all. I swapped a 3.7 vlsd pumpkin into my 3.3 open diff and the vehicle speed sensors don't seem to be compatible.

I don't know much about cars so please excuse my ignorance.

 

I dont have answer for your question but was wondering where did you a g37 rear end and what did it cost you ?

 

Swap your old sensor onto the new diff, it bolts right up (at least mine did). if you have an auto, which I assume you do since you had a 3.3 diff, your cruise will only work up to 80mph and you will get a speed sensor code from time to time.

 

I have a chance to swap in a 2007 3.7 from a G Sedan in my 03.5 at5 open for $200. The OP said it was a direct swap all flanges matched but in pics I see some show a 4 bolt flange and some show a 3 bolt flange. Im not sure what I have now 3 bolt or 4 bolt. My question is If need be I can use the factory flange correct? Looking at pics it looks like the differences in any 03-07 pumpkin is the flange only being 4 bolt or 3 bolt. Flange meaning the part that bolts to the driveshaft? Im ready to pull the plug asap as Im scheduled to use a shop September 26th with my buddy