Few weeks ago when mudding. One guy got stuck on a pretty bad hole.so I tried to pull him out and hear a popping noise then realized that my my front tires stop spinning. I figured it was my front diff that when out. I order a front diff from 2019 kodiak. Swap it out and the 4x4 is still now working. I jacked all four tire off ground and noticed that my front drive shaft is not spinning when I hit the throttle. I tried spinning the drive shaft by hand while still all tire off ground and they spin very slow. Any ideas what may be the problem or what to check for next ????