Although it depends on the engine, I agree with Craig that around 2000+/- is a good number. Try driving at the RPM in top gear to see if the engine has enough torque to cruise in. By the way, I'd be interested in your 2.80's.
Thanks for all the charts and advice, I really appreciate it.
Does anyone know a good cruising rpm range for a stock 289; a range that won't put undue stress on the motor/trans?
When I was trying to decide on rear gears, I just made up a spreadsheet that let me input tire size, gear ratios, and MPH and spat out RPM. Kinda fun to mess with.
I also tried to match my Gen 1 Lightning, which turns right handy at 2400 for 60 MPH, and IIRC about 3000 at 70. The 351 seems to like it well enough, and has 150K miles and still going strong.
Don't bother with a 3.00. Not enough of a change to make a big difference.
If you rarely drive long distances then go 3.50. If you do then get 3.25.
1967 Shelby GT350, dark green, 347 stroker, 5-speed, inboards, #2206
1973 Mustang Convertible, white/white, black stripes, Q-code (351C-4V), ram air.
1968 1/2 428 CJ convertible, R-code, red/deluxe red, auto, finally finished.
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