RE: 410's and rpm?
I use this formula for finding RPMS:
RPM = (MPH / (Tire Radius / 168)) * Axle ratio * gear ratio
I made up a little Excel spreadsheet, and according to that formula, in OD (0.7 for a 4R70W) with stock-sized tires (225/60/16) with a 4.10 rear end, you should be turning 2897 RPM.
With the example above (same except for 245/50/16 tires), it predicts just over 3000 RPM. Maybe the formula is a little high, but I've found it to be pretty close with my stock '98 LSC (2310 @ 80mph).
[font color = blue]Tony - St. Louis, MO[/font]
1998 LSC - Toreador Red/Light Graphite
1987 Mustang GT - Oxford White hatchback