I have a d&d motor and love it. I had then add in the ability to make it forced air cooled. I can run the car 35 miles without stop and the motor temp gets only to about 160f. I can look up the part number if you want but the motor is for the terrell axle.? Speaking of which I had a fun day yesterday. I ran drained the diff and filled it to the plug line. Problem it was to the other dtain bolt plug line. Did not realize this and drove 10 miles. It had increased whine in the gears at a couple of points but no clunking. Got it home figured in would change the fluid again then seen how little was in it, maybe 3oz. Filled it properly took it for a drive and everything seems normal. Drained the fluid had some glitter but no chunks or anything out of the normal. We will see what happens in the future. Anyone do this before? What's your thoughts?