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As far as I know, the only difference in the hydros offered on the older Cub Cadets was, as Roland pointed out, some were ported for hydraulic lift and some (mostly earlier ones) were non-ported. I think there is a difference in the internal pressures between these models, but I believe they are rated the same as far as ground speed. You mention they hydros being "fast"; if you are comparing them to gear-drive Cub Cadets you are absolutely correct. Top rated speed on a gear drive is 6mph, hydros are typically rated at 8mph. As far as the actual "rear ends", they were for the most part similar over the years, but there were several design variations. Some had internal brakes, some had external brakes; the earlier ones were all cast-iron, but later on some were made from aluminum. I've heard of units with aluminum axle housings bolted to cast-iron transmission cases, and aluminum axle housings with aluminum transmission cases, which the pullers seem to prefer. Also, the earlier models used coarse-spline axles, but a few of the later ones used fine-spline axles, which are also sought after by pullers. Just depends on which model and series it belongs to. Your 109 should have a cast-iron rear end with coarse spline axles; if you don't have hydraulic lift, the hydro is most likely non-ported, but the only way to know for sure is to check under the tunnel cover to see, as I think IH sometimes put ported hydros on tractors without hydraulic lift, depending on what they had available at the time.
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