I changed my transmission fluid took it for a drive a noticed it was reving up a little high. 3000 RPMs and I was only going 25. Before the fluid change I didn't have this problem. So I brought it home to check the fluid level again as I was checking antifreeze shot out through the plastic leaving a 6 inch size crack next to the lower transmission line. I did buy a new radiator, cap and thermostat but I'm a little reluctant to drive it again without knowing any idea of what caused any of this.

 

did you install the Tstat correctly? if its backwards that could be your issue causing to much pressure