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Redline on a 6.2 in 4000rpm, best to stick at 3600rpm or lower. Depending on what exactly you are dealing with you may want a higher rearend differential (which is likely already on the suburban) not because of the redline but because of the excess fuel consumption migrating above 2800rpms.
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You mean a higher differential in the [chevelle]? Can you be more specific please, I'm getting confused as to what you're referring to...