ya... you can use a w 56 as a 2wd tranny, just need to get the tail housing, shifter, shift rail and i think thats it... im doing the opposite as you... just talked to marlin today about it.... only bad part is you have to dissaembel the tranny about 90 percent of the way marlin said to change the shafts out... oh also the first gear ratios may vary with the 2wd trannys.... some have a 3.9?'s and the others have 3.8?'s from what i remember..... send me a pm or somthin cuz i will have all the 2wd stuff layin around and we could work somthin out...