I will relate this one more time. My old and sadly deceased a&p mechanic friend, the best natural mech I've ever known, and the most skilled, Roger the Dodger, used Dexron in his km145 tranny in his old mighty max pickup truck. He drained the factory stuff, flushed it with diesel fuel, and then added the dexron. The last I heard, it had well over 300k on the original tranny, and it was tight as a tick. Roger was hard on the truck, and had gone thru about 3 motors and 5 heads, two rear axles, and about 10 front end rebuilds. Roger was no engineer or lubricant chemist, but he was very bright, and retired from the Navy as a Chief Master Machinist's Mate, the most senior enlisted rank, and was one of the wizards who kept the Cactus Air Force flying on Guadalcanal after the Navy sailed off with most of the food, the reserves, and all the spare parts. He went all the way back to the Marine incursions into Nicaragua and Haiti between the wars and snuck into the system as one of the very few "flying sergeants", ending up as a gold stripe aviation pilot before he busted a flying physical.

His mechanical solutions to problems were sometimes unorthodox, but they always worked just fine.

Dexron will take very high pressures and is a very good lubricant, and is a lot thinner than rear lube, so you might pick up a tad of power and mpg, too.

Roger's advice and practice don't follow the factory rec's, and you follow them at your own rish, but if I had a KM145, it would be full of Dexron.

I think I've posted this about a dozen times now, and have yet to find one of you to be that adventurous...