I have a 21 600T with 850 miles. Still has the original belt. Put in a MSC stage 1 kit last year when it had around 500 miles.
It's been a while since I ran the machine, but recently a family member attempted to reverse it off my trailer while the right rear wheel was still strapped to the e-track chock (strap over wheel style). The machine was in 4wd at the time and it obviously couldn't move. I'm not sure how much throttle was given until it was realized. You normally have to give it a bit of gas to get it over the bump of the chock so I'm assuming it was that, plus some (a good amount overall).
I took it for a ride today and when you give it just enough throttle to move, and hold the throttle in that same position, it starts to move and then cuts out and then picks up again but only after more throttle is given. Very jerky. Like the clutch engages, then disengages. Once you accelerate or hold a steady throttle at a higher speed, it seems fine. I may just be paranoid since the trailer incident, but I feel like I would have noticed if this was happening before. What damage could have been caused, if any? I worry about the belt and/ or the differential. No idea how these gearboxes are set up. What happens if one wheel is locked up while in 4 wheel drive and throttle is given? I haven't taken the belt cover off yet, wanted to get an opinion here first.