fiber vs sintered clutches - best ATF for both?

i have buckets of dexron, i wasn't sure if it would cause problems with the clutches, given my near zero knowledge of type A applications, and what's actually used for clutches.

I ended up with a nice GMC 3500 SRW 4xs4 for near nothing because someone used the wrong gearlube and it wiped the carbon fiber off the synchro's in a nv4500. I drove it like that for a bit, it was annoying to float every gear.

But, that's a little childs gearbox that's readily available. Be a shame to spoil the gearbox in this machine that #1, probably isn't another one in the United States, and #2, there's no parts available anymore for it. Reason i'm relocating the hydraulic pump, there's one gear i can't find that's totally stripped out. And i don't want to pull a 2000 pound gearbox that's 4 feet tall, 3 feet wide, 2 feet deep,

I didn't see a lift for something like that at harbor freight.

I dropped the bubble cover for the filter housing, and holy god, it's nearly 1" thick cast iron and weighs maybe 35 pounds, and it's not straight up and down to drop/unthread, it's lateral on the front on the case.

I'm not looking to fight that back in there. I'll be needing to eat my wheaties that morning before assembly.