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that's pretty damn high. i don't think 4.30 ever came in the rear's of 1/2 ton's. you're not in 2nd gear are you? even with 4.10's that seems too high. my o5 had 4.10's and 30.5" tires and ran about 3500 in 3rd gear with would be close to your 4th. i'm assuming it's a 4 speed standard??? if not that's way too much rpm...
13 Eco screw with FX4 and 3.55 E locker
SSI 87 & 91 RX tuned