NV3500 4x4 swap
 

New member here with a new project. 72 K20. I wanna drive it more than just neighborhood trips so any help to swapping transmissions would be great. All the threads I've seen were 2wd. The trans I have is a '97 internal slave , don't care if I stay NP 205 or have to go 208. Thanks in advance. And no I'm not going NV4500 as my motor is dead stock.

Re: NV3500 4x4 swap
 

I don't think the nv3500 would tolerate the weight of the np205 hanging off the back of it.

Re: NV3500 4x4 swap
 

In the stock 4x4 configurations (either auto or manual tranny), the adapter between the transmission and transfer case has a "foot" that bolts to a cross member. This takes a lot of the stress off the transmission. However, I cannot speak for the support of an NV3500 mated to a NP205. As pointed out above, going with an aluminum 208 might be the better alternative.

Re: NV3500 4x4 swap
 

My guess is the 3500 like the 4500 has the adapter built into the 4x4 tailhousing. Google seems to agree w/ me. There are aftermarket mounts for the 205. There are passenger drop NP241s out there that are a bit better than the 208.
One thing to be aware of is the round pattern on the 3500 may not quite line up with a 208/241. Not many of either were made for passenger drop and round pattern. The 205 will need an adaptor for sure unless you hunt down a round pattern one, which are also rare. Then there's the issue of spline count on the 3500; 27 is very light duty and 32 is less bad.

Pic of 4x4 3500: https://www.google.com/search?q=4x4+...wugmFoWLZy9GM: