I've drag raced Mopar 833 on the street and at the track and had some of them converted to Pro Shift by Nash and Liberty, I will not beat very hard on any stock NP833 O.D., especially in my own cars
I have three of them now, 2 B&E body(van and pickups OEM) and one A body, but I am not and have not driven any of them so far, hopefully this summer in my 1966 Dodge Coronet Deluxe with a 464 C.I. 413 truck based pump gas stroker motor
I had to take the A body one apart due to it being at a local powder coaters business with the side cover off
The gears inside of the are tiny