I agree on need for the auxiliary transmission- you couldn't bulldoze without one, because you couldn't adjust the blade to the terrain fast enough to get anything level. Finding a Model A transmission is easy, but good luck finding a bell housing. I remember seeing an article somewhere on making a bell housing so you could install a Model A transmission (I assume it was in an Oliver magazine). IIRC, they used a piece of 6" well casing, with flat rings welded to both ends to mount it to the transmission and to the engine. Had plans for both rings & the bolt patterns, and the length of casing needed.
I have an OC4, and its got a usable ground speed in low, but still not as slow as I'd like. You could buy the OC4 with either an auxiliary transmission, or a reverser. Mine has the reverser (still need to use the clutch), and I'm glad I have the reverser than the aux transmission.
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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