You can install a governor on the transmissions too. WOT will shifts will be higher. Corvettes and police cars had the option.
You can find parts at
www.bulkpart.com
My 700R4 is modified to shift into OD at WOT!! I have not tried it yet. I've made it up to 110+ MPH in third gear before letting off. I'm curious at what speed it should shift into OD.