I have a 1st Gen Camaro w/a 12 bolt, aftermarket axles.. 4.88 gears w/a spool, 30" tall tires. Motor is a blown 383 SBC. I dont want to go over ~6k rpm and am wondering what a optimum gear is for street and strip assuming a 30" tall tire.

 

I will move this to Classic Tech as it really isnt an 'Advanced' question.

You may also want to check out https://www.camaroz28.com/calcs/bestgear.html

 

Stick with the 4.88s. IMO anyway.

 

What kinda MPH do you expect? Just run the numbers backwards shooting for 6000 RPMs at that MPH and you're right there. A 30" tall tire rolls about 94" per tire revolution, BTW.

 

As kind of a wild guess I would bet you'll turn about 3400 at high way speeds. I know a guy that has 4.11s in a 69 chevelle. When he hits 70 mph that engine is starting to really hummmmm.