heavy engine braking & cheetah VB

I contacted TA-cheetah gave them my specs. they said the reason why it is instantly brakes when I let off positive throttle (even at cruise throttle) is because the gear I have, which is a /6 highway gear that i have yet to change. they said many people rebuild/modify the rearend before the trans which is why people don't really experience the type of engine braking that i do. but they said that because if the highway gear, in order to run in 2nd the engine should be about 3500+ otherwise (like what was said) if the engine drops below about that amount the trans "thinks and mistakes for a downshift" and immediately starts to engine brake. but they said just drive the hell out of it and i'll be fine. so thanks everyone for your help. I appreciate very much. thanks again.