My Troopy's gearbox wasn't very nice when we got it..... switched out whatever fluid was in it to Penzoil Synchromesh trans fluid and it was like night and day. It's one of the smoothest shifting transmissions in any of my trucks. Same 1FZ-F with the H150 in my truck as in yours.
I feel pretty comfortable that it's a statement of fact vs. a shot across the bow since I have an Omani Troopy and have read probably every thread on Mud about ones that have come from Oman 😂
You've got a truck that will keep surprising you the deeper you dig. Trust me.