Old Man with a Hat
FCBO Gold Member
- Nov 16, 2010
- Reaction score
- Idahoan displaced
You have to do the math on the highway rpm has to be above 2000 at the speed you would like to cruise at.
|mph||final drive ratio||Top Trans gear ratio||Revolutions per minute|
....2.94-3.23 with a .69 od and tall rubber your 65mph rpm is in low 2000s hard to pull anything that low but flat or downgrade, now if you want to cruise at 80-90 mph steady for an hour I can definitely see it. can't do that here in pa. because of traffic so its not really on my list.....
I didn't say don't do it just anything taller than 3.55 it just won't pull with a .69 od. I put a 440 in a 69 barracuda it had a perfectly good /6 did it because I wanted to go faster not cause it made sense or cents.