im a little need to this form but i could use a little help I have a 1974 dodge motor home and i want to put the rear end under my 1985 w150 can any tell me if this is possable with little modification also the max tire size that will fit it im building a mud truck out of the 85 and this motor home is just stting here so i thought it would look sweet with a dually
under it

any help is greatful
thanks

 

i don't think you would be able to use the dually axle. the rear axles would need to have the same gears as the front axle.

 

Can't I just change the gear ratio

 

also I'm changing the front 4 wheel drive to 3/4 ton prob should have said that befor