fastford2

Got this truck for free it had the front drive shaft out I noticed the u joints were bad. I replaced the u joints put the drive shaft in and went to test the 4x4 and the thing like to jerk me off the side of the road. I took the drive shaft off it stopped. I manually switched the hubs and it did it but not as bad. I turned the yolk going into the diff. And at first the front axles didn't spin but it did intermently what do u guys think. And if it's the gears I cannot find anywhere where it shows a diagram on the inside of the differential. I am used to the straight through diff this has the twin ibeam suspension. I have never owned 4x4 but owned does my whole life. Just confused