When I was in high school, we tried out a used 4630 with a syncro range transmission. That is the only one I have seen personally, but I have also seen a few listed in various classified ads. The 4630 we did purchase had a power shift transmission. Always felt it needed one gear in between 4th and 5th, because that was quite a wide step in between. The Quad Range offered that necessary step in a 4630, and the rest of the 30 and 40 series tractors, but it also was a matter of personal preference. I didn't like the 8 speed transmission with the lack of gears, for heavy tillage, simply because of wanting a gear midway between 4th and 5th. I did like the 8 speed powershift for ease of use by less experienced operators for hauling grain or that sort of work. I also liked the 8 speed powershift for cultivating and planting. I tend to prefer the 8 speed syncro for loader work.
I am not completely positive, but I believe the 8 speed syncro transmission in the 30 series is set up similarly to the earlier 4000 tractor, whereby they lacked synchronizers between for forward and reverse stations in the transmission. They were only synchronized between the forward stations, which is essentially how the quad range is set up, and I believe a quad range is essentially an 8 speed syncro with a hi-lo powershift clutch pack inserted into the drivetrain. I don't want to open up a can of worms here, but the hi-lo in the quad range was Deere's alternative to IH's Torque Amplifier and Ford's Dual Power.
Having had a 4630 powershift; yes, repairing an 8 speed powershift can and does get expensive. Having had a 4640 quad range; repairing one of them can also get expensive.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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