95 dodge ram tran

ok here is the truck info its a 95 dodge ram 1500 360 4 wheel with 195000
on it and 50000 on rebuilt tran ( built by a tranny shop )

ok first when i pull the stick in four wheel on gravel or tar it feels like im pushing the front and has a hard time disengageing all the tires are the same size and are stock size i pit both front bearings in but this started about 10000 after that

ok second and more recent when i put my foot in it the over drive kicks out and the engine revs to about 4000 but i dont go any faster the engine sounds like its lugging and when im not on it its just fine it does it when im pulling something or not

any help
thanks steve

when was your last transmission fluid / filter change? and did you have the transmission bands adjusted? Manual says 30k intervals!