Bought a used Dana 50 front axle assembly complete hub to hub. Was told is was working when it was removed by seller. I replaced differential fluid and installed. Hooked up brake lines and bled system. Now at about 10mph the truck seems to hop. This is on snow packed roads. It's like one side is engaging and disengaging about every two to three seconds. Making the truck bounce. Any suggestions welcome.
BTW. Manual locking hubs

 

Did you check to make sure the axle ratios were the same?