The Power Quad and Auto Quad are a four speed power shift in front of a GEAR transmission with 4,5 or 6 ranges giving you 16,20 or 24 total speed selections. These ranges are synchronized . The only difference between the Power Quad and Auto Quad is how the power shift part can be shifted. The Power Quad is manually shifted by moving a lever. The Auto Quad is shifted by moving a button for manual shifting and it can be set to Automatically shift under different loads.
The Power Quad or the Auto quad are a much better transmission than the old eight speed power shifts. They have proven to be very durable and have at the least twice as many speeds. The old eight speed power shifts held up well but where limited in speed selections for field work. In the higher horse power tractors you many times could run against the governor in one gear but not pull the load in the next. With the Power Quad you would have a gear selection that would "fit" the load.
The 15 speed power shift was a GREAT transmission. I prefer it over the 19 speed that replaced it. The 19 speed is durable but can be very aggressive when shifting in certain speeds up or down shifting. Especially when the oil is cold. I have seen guys break the back window out with their heads when they hit one of these "jumps". When the 10 Series ( 7610,7710, and 7810) came out JD had a much improved Power shift control program. These tractors did not shift as aggressive when cold.
Your JD 4020 8 speed power shift was a marvel for it's time. The trouble with them today is the cost of repairing one can be HIGH. You can easily get to the $5K mark with not much being wrong in one. I ran into one that still shifted but shifted rough a few years. Using new parts it was going to be over $12K to fix it. We found a donor tractor and kept the repair bill under $7K. The cost to repair one is why I do not personally own one.
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