Capsule doesnt collide capsule properly

I have two gear models and since mesh colliders dont collide with each other properly (I've tried convex), I placed capsules inside every tooth of the gears and added the 'Configurable Joint' and 'Rigid Body' (Using these components I also locked unnecessary rotations and movements) Components to the gears. This script was added to one of the gears.

 public var speed:int = 1;
 
 function Update () {
     transform.Rotate( Vector3.forward * speed * Time.deltaTime );
 }

After playing the game, when I brought the other gear near the spinning gear, It started spinning tremendously fast whereas the other gear still rotates very slowly.

Please tell me how can I fix this glitch.