So I’ve got a 96 with a 5.7 vortec, 4l60e transmission (motor and trans are not original if that matters) and the rearend has low gears. I’m told 373, I think lower. It wasn’t a rearend swap from a 4x4, because it’s still 5 lug. My speedometer is now about 10 mph fast, would that make my rpm also incorrect? I can tell my the tone my highway rpms are higher than normal, but the rpms read around 2600 at 70mph. Can anyone share previous experience with this?
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