"spool 40 spline gun drill. Aluminum case🖒🖒..we did a back to back test with a 8.3/4.vs9 in a 69 dart that the 8.75 ring and pinion would only last 100 pass before they would fracture💣💣... the 9-inch was only 400 slower.... the pinion on a 9 inch is much lower enabling the car to Be set up lower... 9in all day any day"

In your test, do you mean .04, or .004?

Everybody talks about the 9" in-efficiency, and I read where 3 rear types were compared. But in that comparison an atmospheric change could have easily negated any and all differences.

Has anybody seen/done a torque in/torque out test? I just find it hard to believe this rear is not efficient. I run two of them.