I'm not new exactly to rc, however it's been about 12 years since I have been envolved seriously. Purchased a losi sct for my son a couple years ago radio went bad. Bought a mt4 for him and got it running, but have a couple issues. Hopefully someone can help. When he runs forward and let's off the truck just locks up and does not free roll and he also has no reverse I think they are possible related. Any help would be much appreciated as I think we are going to get some father son bonding time as soon as baseball gets over then we are going racing.

Have you tried recalibrating your esc yet?

No I will try that

Definitely an ESC calibration issue, easy fix