Yes you are right, so the w56 is stronger than the g56 are there any gearing differences. They are the same length, any difference in the shafts.
yes---- the W56 is quite abit stronger,
no----- theres no gearing differences, both have 3.95 1st gears, 1-1 4th and .85 overdrive 5th,
they should be the same shafts,, if i was you i would take the W56 tranny and tcase and put in the truck, or w56and tcase +marlin adapter+ truck forward shift case, converted to topshift, then you would have dual cases
and one of the strongest trannies
assuming the forward shift is the one thats stuck in 2wd, because the shift rails are probably bent slightly