!!! new best but broke the rearend!!!!

i'd say you broke the ring and pinion gears. you said 4.5 passes, so you where out of first gear when the rear broke. if so the sprag is not in play after your out of first and will be fine. i think the others are correct in that a higher gear will help you get to the 10.50's. the 440's seem to like between 4.10 and 4.56 gears for some reason.