building 8 3/4 489 section

Understood, these things are heavy. Your car is probably 3300-3400 pounds with you in it? Don't be surprised if you shuck some teeth of the r&p on a hard almost dead hook launch. Keep an eye on the pinion, if you start feeling any front to back movement in it pull it out and have it set up again.

Jpar how heavy is your car with you in it?