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Re: 4000 rpm @ 55 mph
His gear ratio would have to be 6.71/1. Even with 26" tires he'd have to have a 5.63 ratio (I have no idea what exists beyond 4.57) So it's pretty safe to say the tach,speedo or both are way off (or his clutch is slipping!)
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.
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