my runna has 4.10 gears and I'm runnin 31's. will this effect my top speed? It's hard to get up to 70 +. so i guess I'm askin do I need to regear to 4.56?
oh, it's v6 auto

 

I'm about to do the exact same thing. 4.56 will be the correct ratio for 31s, but I think I'm going to end up with 33s. I bought a rear 4.56 third and a 4.56 front differential. I think it cost like $250, shipping and all. I'll have them in as soon as I get my aussie locker. I'll tell you how it drives then.

 

Hell, I just looked back and saw you had an automatic. You probably already have 4.56s, and you probably want to go to 4.88