Hi,
I can purchase a 2008 pumpkin that has the 3.62 ration but there is an issue and it is not working well.
Is it possible to open the pumpkin and take the parts from it and install it in my 2012 pumpkin?
Thanks.

 

What isn't working? the pumpkin should be the same is both came from auto or both were manuals.
you can swap the internals also if you needed to. I installed a 350z manual pumpkin in my g37 manual. all the dimensions are the same.

 

I want to install a helical diff but I don't know what will fit to it, do you know?

 

you can install any diff that's made for our housing; Quaife, Wavetrac, and other clutch types.

I don't know of any oem Nissan/Infiniti models with helical type diff that will work in our. The Nissan S15 Silvia came with a helical diff but that won't work in ours.

But if you buy any diff from any year G37, 370z, G35, 350z, they will alsoo work. There may be some small things to change out lilke the stub axles from 350z/G35 going into a G37/370z, but that's about it. And of course, the 3 bolt driveshaft flange vs 4 bolt.

 

I'm looking at Quaife or wavetrac, but I don't know if I need anything else to replace...