trans fluid check 350 with turbo hydromatic

[truckster]

Originally Posted by SS Tim

Hot, idling in neutral. Check your owner's handbook for more information.

Owner's handbook.

But yes, hot and idling in neutral (or park). And run it through the gear positions (P-R-N-D) if it's been sitting without being driven for a while.

DON'T OVERFILL! That's a bad thing to do. And realize that while the approximate fluid volume between lines on an oil dipstick is 1 quart, for the transmission it's 1 pint.