you mean differentail lock ? hmm not that i know of but i wouldnt want my front to be locked since it a turning wheel. too many different ways to damage the front axel. I dont think a small tractor can handle something like that anyways. There is a reason why the back dont lock all the time. Its only when you need it at the spur of the moment.
The same as you would need the front locked at the spur of the moment.
But I don't see the bx being much of a rock crawler (too tippy) and by the time I have needed the front locked it was already too deep I don't think it would have made a difference.
Kubota would need to redesign the front wheel drive to a much heavier spec to make that a viable option. Take a look at the front driveshaft and u-joints. They are built with a margin of safety for the current application but they do require the front axle to spin one tire to keep the loads reasonable.
Cat D3, Deere 110 TLB, Kubota BX23 and L3800 and RTV900 with restored 1948 Deere M, 1949 Farmall Cub, 1953 Ford Jubliee and 1957 Ford 740 Row Crop, Craftsman Mower, Deere 350C Dozer 50 assorted vehicles from 1905 to 2006
I've asked myself the same question... the rear differential lock has saved me several times now that I know to use it early.
Just the other day I got in a position down by the creek bank with one front and one back wheel in the air... so no brakes as I'm sliding towards the bank. The rear differential lock came through and I was able to power reverse.
LSD (limited slip) might be nice. Or fake it out with independently controlled front brakes... I'd hate to be the engineers that had to fit those pedals on the platform though.