i just finished rebuilding my 87 4runner and everything is perfect cept for the driveshaft. the driveshaft where it meets the rear differential is loose and i dont know why. almost everytime that I shift it shakes and takes a second to engage, you can pretty much feel the entire car jerk because its loose. all the bolts are tight and nothing is broken, yet i can get down there and move it with my hand. does anybody know what could be wrong with this? its mostly just in the rear but it may also be the front too.

mike

 

U-joint