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Georgee
Many factory mods were offered back in the day and a few people that knew those trannies really worked magic with them,however most are gone and Dead, most around here use the 8 speed. The power shift is fine if in great shape adjusted correctly for starting, but overall use and future updates might require the 8 speed.I had one with stock engine, 3000 rpms and high air pressure18.4 x 42s road worn,the Power shift and proper drawbar and would out pull similar tractors with 20.8s and much more HP,and start out in the gear they finished in. Good set up and paying attention to details matter a lot.I remember digging a hole in the yard gravel to install new pulling drawbar that looked stock, LOL. The pto area is square and easy to install weight bracket. I made my own 8 bolt adapted to use the 42s, making parts you can helps bond with the tractor and makes it more fun to compete with. Have fun, but keep in mind farm stock AIN'T SO STOCK , most places., however the slow speeds help.

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Gale
First off check all your cable linkage for proper adjustment on the ps valve an clutch pedal.

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Case dude
Sounds like you might have a sticky spool in the control valve on the right hand side of the trans housing. Not returning all the way/at all causing things to keep moving. Most bolt the torque limiter to the flywheel, and then shim the pressure relief valve to get some more charge pressure.
That being said I don’t think it’s worth do all that. Lots of work and will still have many weak points if you start making 400+Hp. Like said above farm stock is far from stock. 1175s are good. 9-1070s 8 speeds are lighter (no planetaries), and will take a good load of power with just a double disk clutch in them.
There’s lots of threads on here about tuning up a 504 engine. Give it 30-32* of timing, and remove the shims on the pump rack, then turn it up till there’s a thread or 2 showing on the fuel screw.1370 injectors aren’t great. Best engines are 1570 2670 2390 2590 4490 4690 as far as bottom end and injectors.

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rdl1953
You need to find a 970-1070 8 speed tractor or chassis as you can not put an 8 speed trans in a 1370, the steel flywheel most likely isn't needed at 3000 RPM, the clutch housing on all power shift tractors is wet, meaning it has trans oil in it, plus the fact of the power shift drum and planetary spinning over 3000 RPM isn't a good idea. As far as the 1370 trans problem you have now,be sure the clutch pedal is moving the spool out as far as it can, you should here the power shift "grunt" when the pedal is pushed all the way down. Get your 1370 fixed and running then look for a 8 speed tractor.