A833 4-Speed on a 4-500hp 440: 18 or 23 Spline Necessary?

large input shaft bearing 23 spine , should be fine . but if you want a 18 spline it would be best . it has been years since i bought mine . but i bought one from a guy with a hemi cuda that was all alloy case 18 spline input and red strip gears . i have got a bud that has a 18 spline iron case it got the nascar input and red strip gear package . but its setup with a yoke output for the bearing over bushing . and yes the red paint can be removed , lol . DSC03802.JPG