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

ToMang07 said
Yup. This is all new to me. I know the difference between LS/Open/Posi differentials. "Spool" is new to me, unless you're talking about turbos, lol

spool = no open, no sure grip just two gears and two axels. Direct drive to both axels at all times.