You all need to get your info straight. It can
be done, but you need the right combo of bell housing and trans to mate properly.
Marlin used to make a bell housing for this type of application. Now you need to find a newer R155F bell housing.
See this post from Big Mike on the Marlin board-
Thank you ShowStop, you are spot on Sir!
This just solves the mating issues. Mounting and driveshaft mods may be required depending on several factors.
The V6 transmission (R150F) is about an inch longer than the 4cyl transmission (W59), so this will require modifications to the cross member mount and/or cross member, as well as possibly the rear drive line. I don't recall off hand, but I believe both t/cases are the same length (I'll need to go measure them to be sure).
So the easy answer is to just get another W59 trans. It will be far easier and way less expensive to go this route. They are very strong and reliable.
I definitely agree with ShowStop on this. The W-series is a good transmission (it was even used behind a 2.8-liter inline six cylinder), it is lighter and has a slightly lower 1st gear (3.95 vs 3.83) so it will do better off road. You could take advantage of the taller overdrive of the 6-cylidner (0.838:1 vs 0.850:1) but looking at our old Vehicle Speed Calculator
, it's only gonna net about a 40 RPM engine speed difference on the highway.
My opinion is to keep it original & keep the 4-cyl trans in there. As for finding a good used W59 transmission, have you tried Jeff @ Toy Connection (near San Jose, CA - (408) 988-4040) or tried searching wrecking yard databases such as www.car-part.com?
If all else fails, we rebuild em and make them bomb proof with a bunch of heavy duty upgrades http://www.marlincrawler.com/transmi...t-complete/w59
Best of luck!