thanks everyone. It is for a ford 9" irs that I am doing. I don't have any experience driving anything with either one of those gear setups. Infact the only muscle car i have had, I am pretty sure it had low 300's for the gear ratio. I bought it and sold it a few years later. So according to tremecs website the overdrive ratio is .62 so with 4.11's @ 80mph i would be at 2565 rpm. That sounds decent plus it would give me a little more "get up and go" . Am i looking at that right? Just wanted to check. Anyone driven both 3.89 and 4.11 gears? Any noticeable difference?
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