Foote did make gearboxes you can split but on the mustang they were sealed like I said before it only has 1 forward and 1 reverse gear I have owned ten of these machines over the years, they all had stiff gearboxes and every one of them freed up with a small amount of use, my opinion is you will be opening a can of worms for no gain by splitting it, why donβt you get the thing running and drive it first ?