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Yikes!!! Go back to square one and rewire that mess. Frank

There are a pair of rebuilt 4.89 gears on the G503 forum right now. https://forums.g503.com/viewtopic.php?f=56&t=320219 t

You could also try Bob Stahl at Veteran Vehicles, https://www.veteranvehicles.com/, he specializes in gear swaps, rebuilding, and parts. Frank

Installing 4.89 gears would be the easiest route. Everything would fit and you would get the mph you want. Frank

Get the head resurfaced, .022 isn't that much. Frank

As stated above, check the compression. Frank

GL 4 is what I have used, although GL5 could be used also. As I recall the syncros in the NP420 are aluminum not brass.

I use 85w-90 gear oil. Frank

I believe they are construction holes used to position the sheet metal while forming. Nothing goes in the holes. Frank

As stated above I think the accelerater piston is not working properly, worn throttle body or bad seal. Frank

I love it!!!!!!!!!!!!

Nice website, good information. Frank

Go to the Technical Manual section on this site and download the TM's for your truck. You will find the answers to your questions. Frank

Sounds like its the parking brake dragging, that's my guess. Frank

Midwest Military or Vintage Power Wagons should have them. Frank

I used a Dodge 360 with a NV4500 transmission, 5 speed with overdrive. I kept the original brakes and added a booster. Brakes properly adjusted and with the booster will put you through the windshield if stomped on! Frank

You could also look here. https://www.4btswaps.com/forum/activity.php

Usually the ball for the gooseneck is slightly ahead of the rear axle. Frank