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With a manual, you control your own shift points. Here's a chart you can use to see what RPMs you'll be at in 6th gear at 70 mph, i.e., when you can't upshift anymore.
Generally, for a manual trans 3.8, you want 4.88s for 35s and 4.56s for 33s. That said, if you go with a light enough wheel/tire set of 33s (like I did, here), you'll be fine on 3.21s.
Generally, for a manual trans 3.8, you want 4.88s for 35s and 4.56s for 33s. That said, if you go with a light enough wheel/tire set of 33s (like I did, here), you'll be fine on 3.21s.