May be help, may not, but I just posted the shifting instructions that were on the visor of my old rig on the "split shifting" thread.
It does sound like what was going on with my truck though, it was stuck in low and had a blazing top speed of 38! Was just sticky, once I changed the lbe out & started using it it loosened up and shifts fine. just need to practice so I'm not grinding it so much!
1956 GMC 370 dump " 'Tater "1970 VW Volksrod "the Black Bomber"
2007 Chevy Avalanche
2020 Jeep Cherokee Trailhawk,
2005 Harley Davidson FLHTCUI
I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P