Exactly!I get what you are saying, but there are different forces on a snowmobile drive shaft, vs a trophy trucks front axle drive shaft. When the trophy trucks suspension cycles that spline is designed to move in and out with the suspension travel.
A snowmobile rear suspension and track, is alot like a dirt bikes rear swing arm. As the suspension compresses, the track gets tighter, same as the chain on a dirt bike.
The spline on the doo drive shaft is seeing that cyclical side loading alot in the bumps. Too tight of a track will make that worse. The only thing holding that coupling and bearing in the chain case true, is the bearing fit, and a circlip.
It does work yep, excellent idea for guys who change tracks alot racing, is the two piece shaft a problem? Remains to be seen IMO, but what I did notice when on the trail was a new noise in the drivetrain, a growling like something was rubbing on the tunnel but nothing was, no ice build up.
I have not heard that noise yet with the one piece shaft. According to my dealer, lots of guys last year complained about that exact noise. Time will tell.
Sent from my iPad using Tapatalk