7040 through 7060 would be my choice. Don't use 7080,has thick heavy planetary gears and 4 inch axles. I pull a 8000 series, same power train as 7000 and up to 450 hp the PD held up fine. When I pushed 500+ in 4th high coming out of the hole it slipped and then violently shook and bounced, no fun. You will also have to bolt torque limiter solid. I've found one solution, purchased a PD from a puller who removed the low range piston and now only pulls in high range using 12 clutch plates. He pulled one season at 1000 HP no issues. I still havent dissected it yet to see exactly how it works.
At 1000 + HP road gear isnt fast enough so he moved on to different tractor. Like to add he didnt try doctors idea of using power shift high low range gears.
One engine suggestion is get a D21-210 ex manifold and port until slightly larger then heads ex ports, then weld or machine a divider plate separating the ex halves right before the turbo. The plate is worth 100 HP on 1000 HP engine, dyno proven.
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