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A laundry list of items you might want to throw at that tranny. I would recommend all of them, if you can.

-Trans cooler - for off road use, the bigger the better
-Temp gauge
-Deep oil pan
-34 element intermediate sprag clutch
(When I built my TH400, this was the ONLY internal upgrade that B&M said was necessary to hold up to about 570HP & 500 ft-lb of torque)

Also, if you ever turn more than about 4500 - 5000 rpm in 1st gear, you will need to get the appropriate valve body, or make the appropriate modifications to keep it from automatically upshifting to 2nd. Usually just a modification to the 1-2 shift valve.
 
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