transmission fluid for a built th350

Power adder or na car ? How high is the stall ? Transbrake ? Vehicle wieght and HP might be nice.

If its under 800 hp without a T brake standard dexcron/mercron 3 is fine. If you over that and running a tbrake Use the john deer hyguard. If you have a Tbrake and a lower powered turbo supercharged or nitrous car and might be on a Tbrake for a while run John Deer Hyguard 50/50 sub 800 hp.
 
3000 stall around 500hp n/a maybe nitrous later around 3400lbs

is there anything better then dextron like more thicker and sticky
 
Just as important if not more important is to keep the fluid temp down.
The fluid temp in the pan should not exceed 200 degrees f.
Don't get cheap when buying a cooler.
 
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