I realize the topic of which gear ratio to use is probably one of the most beat-to-death topics in this hobby. But, after much debate I cannot make up my mind and am looking for input.
I'm restoring my '70 rear axle which was originally equipped with traction Lok, 3.50 gear ratio, 31-spline. The engine is a 428 with a 4-speed.
The goal with this car is to be able to drive it at reasonable highway speeds (60-65mph) for short distances (30-40 minute drive). There is no intent of ever drag racing the car. Accordingly, the 3.50 ratio is not an option.
I cannot decide whether or not to use a 3.25 or 3.40 gear ratio. Both options are readily available. The 3.25 will most significantly lower RPM at highway speeds. The 3.40, however, seems like a very compromise between the factory 3.50 and the less "torquey" 3.25.
Using several online calculators, I think the 3.25 is going to yield ~2500-2600 rpm, while the 3.40s will yield around 2900-3000 rpm.
I'm looking for feedback as to what's the maximum RPM I should be trying to target with a 428. I'm a bit nervous to be running close to 3000 down the highway.
