I tried a search but it didn't give me too many solid results.

Some people say Type F in a street/strip application. Other's say Type F is too old and doesn't have to additives required to last long.

Some say Dexron is the approved fluid. What I was able to find locally was Dex/Merc.

Transmission is going behind a stock/mild 440 in a heavy Ramcharger. If it makes a difference, I don't want to have to tear down the trans every couple thousand miles and the truck will be driven in Arizona (6 months out of the year might be pushing 100 degrees.)

Thanks in advance.

Cheers,
Pat