Last weekend finally got to try doing some work with my recently purchased LGT 145. What I was doing was filling a hole from a repair that I had done at my mom's place. I was pushing sand with the plow / dozer blade & what impressed me the most was the traction that this tractor gets. When I changed the fluid in the hydrostatic rear axle I had both rear wheels off the ground. When turning one wheel the other wheel would turn the opposite direction. This being like the open rear axles on cars I figured the wheel with the least amount of restriction / traction would spin. What I found was tractor is putting power to both rear wheels. I had the tractor in some lose sand where it sank in the height of tire side wall & still pulled its self out. A couple of times had only one rear wheel still on the ground & still kept moving. I am sure this traction must come from the hydraulic drives of this rear axle.
Now my wondering mind & this can be a dangerous thing is thinking about my LGT 100 which is a gear drive would be worth changing to a LGT 105. The gear drive axle is definitely an open rear axle. When one rear wheel loses traction it gets stuck & needs to be pushed / pulled out to get unstuck. I have another LGT frame with a Hydrostatic rear axle. The one big difference is this frame is for an open side LGT & the LGT 100 is a closed side. The open side frame has an welded in oil pan, which seems to hold more oil then the closed side. My LGT 145 takes 2 quarts with oil change where as the LGT 100 only takes about 1 & 1/2 quarts.
This conversion will not happen with in the next couple of years. I know that the 90 degree gear box on the LGT 100 will need to be rebuilt some time as the seals are starting to leak. I know removing this gear box is not easy, I learned this last year when the key sheared off on the driven shaft. This helped me convince the wife of the need for a second tractor.
Sorry for my rambling on but I thought sharing these ideas & getting others thoughts on it would be helpful if or when I may attempt it.