My overdrive seemingly unlocks extremely fast and im not sure if this is normal. I can be going around 60 mph in fourth gear at lets say 1800 rpm and even if I just give it a tad bit of gas, the rpm jumps up to 2500 rpm and continues accelerating, no downshift. My brothers 99 camaro ss does not do this. It stays locked while it accelerated in fourth. Whats the problem?

 

Probably a difference in tuning between the two cars