We used to run 5 cubs in stock classes, don't have any now. My son got real good at replacing the trans could have one out and back in in 30 minutes at the pull.
Gotta agree with ya OkieGT cubs can mow the lawn (usually with out breaking their rears) LOL
How heavy is your sled??? And what kept breaking? Ive never had any problem with cub rearends especially in stock for. The fine spline rears hold up but better but I have a coarse splined and its still holding up in the 875 and 975 adult class.