I'm still debating which swap would be easier for my '70 fj40, I'm leaning towards the 465 because I may have found one for cheap, my question is what are the "swap" differences between the 2wd and 4wd models, and how do you tell them apart? I think the one I found is 2wd, so I want to make sure it will work with my 3spd T-Case. Any help would be great!
The 2WD output shaft sticks out further and has a yoke on it to accept a u-joint. The end of the shaft is threaded with a nut holding the yoke on. The splines that the yoke slips onto are finer than the splines on a 4WD tranny that mate with a GM transfer case. If you buy a 2WD sm465 and you're using the AA type adaptor, you will have to cut the threads off the output shaft so a spud shaft can go on. I did it on the radial arm saw with a cutoff blade. Lots of folks use a handheld grinder with a cutoff wheel.
You could also buy a replacement 4WD output shaft. I think that would allow using a plate adaptor; others will know.
The best bet is to find one with the 10 spline shaft. Than you can use a plate adapter to keep the the drive line shorter and save $$. You can change the mainshaft they are about $190.00 and it means pulling the tranny apart. The 2WD and I think late 4WD have a long 35 spline shaft.
all the info sounds right on i have the 2wheel drive one and had to cut shaft and go with AA adapter.the adapter is about 5 inches long . i would have liked the 4x4 one and used a plate adapter better for a longer rear driveshaft .. i have sm465 2wd to 3sp.case if i would do it again i would use the 4wd one and go for the plate adapter or a doubler or something (marlin toybox, ETC.). for the price i paid for the AA unit 5 inches long i should have just bought the toybox .
As nailbender said your best bet is to get a 465 from a 4wd. It will have the 10 spline to match the 3spd t-case. I run this setup in my '74 and it works great.
Woody has a great write-up in the Technical links.
Woody also has the plate adapter you want in the Vendor section.
Thanks for the info guys, hopefully I can get up thwere this weekend to take a look at it. If it isn't 4xd sounds like I should just hold out for the right one. Or pick up a 420.
