Hey guys, I own a 2001 ford f150 sport 4x4. today I was driving home from school when my truck starting doing a constant "jerkiness" every time I hit the gas. I checked my U-joints, I just replaced one a month ago and the other is still solid, but when I let off the gas the riding smooths right out. it also can't decide sometimes to shift down or up when going 45-50mph. it seems to help when I turn overdrive off. any help would be great,thanks guys!

 

Change fluid

 

could it be bad torque converter? MY four wheel drive shifter is stuck and it seems to be stuck in the 4H position casue i can pull it to the left but i cant move it forward or back but when im in the snow i can fishtail so i know im not in 4H

 

I changed my spark plugs and everything runs great.