When you say that the low side is out, for my reply I will presume that the tractor does not move when the lever is pulled back and a whine is heard from inside the TA housing.There are actually two major parts to the low side, one being the planetary carrier and sun gears that you mentioned (which rarely go out) and an over-running clutch that consists of ramps and rollers that wedge against the planetary carrier (which frequently goes out). When you pull the TA lever to go to the low side, you are disengaging a clutch that connects the planetary carrier directly to the output shaft to the transmission. This allows the sun gears to run in the planetary, reducing the gearing to the output shaft. Disengaging this clutch also frees up the planetary carrier, allowing it to spin backwards unless the over-running clutch (consisting of the ramps, springs, and rollers) prevents it. If the over-running clutch doesn’t stop the planetary carrier from spinning backwards, you don’t move with the TA in the low side and hear the whine caused by the rollers trying to bite into the planetary carrier. As soon as you let the TA lever ahead, the direct clutch hooks everything back up and the tractor moves in high. Now, for rebuilding vs. a salvage yard TA. At one time there were after market over-running clutches available that had oversized rollers in them, making the surface area larger and more durable. I don’t know if these are still available or where you might get one. If you can get one of these, I would suggest considering the dollar output and what you plan to do with the tractor in the future. I would go this way, but I have rebuilt two of these using the IT shop manual as a guide. Rebuilding them is not terribly difficult, but there is one seal that needs to be put in against the sealing surface which requires a sleeve to protect the seal from damage. Rebuilding one is however particular work, requiring getting the sun gears aligned and positioned properly, all which is described well in the manual. With a salvage TA, unless you measure, or really trust the guys at the salvage yard you won’t know what you are getting. Good luck and I hope this helps explain how the 50 and 60 series TAs worked.
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