Quote:
Originally Posted by Def
This sounds like a good case to use a 275/40-17 and a slightly longer diff then.
A 3.91 J30 diff is about 4.4% longer, and a 275/40-17 is 4.0% larger than your current tire.
So that would give you 8.5% longer gears total with those two changes.
Giving you speeds of:
1 - 38 mph
2 - 63
3 - 94
4 - 124
5 - 163
Doesn't sound like bad gearing to me. Hell, sounds better than the long gears you get with a 4.08 on an SR box. You'd also have some tire to put down some speed. Don't go with a 255/45-17, the sidewall would look absolutely ridiculous. Even Mustang guys don't use that much sidewall on a 17" wheel.
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I tend to agree. Make one change at a time. Pick your rubber first then look at how the car responds.
I wouldn't go much lower than a 3.5-3.6 at most for your current setup.