Worth more to me as whole tractors!!! Even in bad shape I would have much more interest in rebuilding and returning it to use again. However, from a financial aspect the most money would probably be in parts.
The traction boost is used with mounted implements, such as a plow. It is the real heart of the WD system for heavy work with mounted snap-coupler implements. You have to set the hydraulics up for the traction boost, you drop the implement and then raise the hyd lever about 1/4 way or so. With the WD-45 you will see the gage rise. The WD never had a gage. As the pull increases on the drawbar the hyd system will transfer some of the implement weight to the rear wheels. Works super when plowing!! If you convert to 3-point it will not work without a special 3-point system, availabe from some of the vendors on here.