2001 Kodiak 400 4WD Not Working

[RatpigHoosier]

Hey, guys I’m at a complete loss now. When I bought this thing a week ago the guy (who I know) said it needed a new front diff, which he provided with the bike. I took the whole thing apart, replaced the diff, checked the splines on the axles and on the drive rod on both ends. The pinion gear splines all look good too. I put it all back together, including new wheel bearings on one side. Got her up on jacks, started her up, hit the 4WD button, heard the actuator engage, put her in gear and……Mike Ditka. 
The old diff I took out sounded like a bucket of nuts and bolts when I turned the input. The new diff sounds nice and smooth and the outputs turn nicely when I spin the input. The only thing I can think is that something is wrong with the actuator, but it sure sounds good when I hit the button. 
Does anyone have experience with this?  What am I missing?  Any help would be greatly appreciated. 
 

 

[RatpigHoosier]

Found a site that said the servo might not be timed properly. I took it off and made sure it was correctly set and put it back on. Still nothing.