I would imagine it all comes down to what RPM power band your cam develops. If the gear is to tall it will lug the engine, to low and it works to hard. Use an RPM calculator to help find that sweet spot everyone looks for .

https://spicerparts.com/calculators/engine-rpm-calculator

https://spicerparts.com/calculators/transmission-ratio-rpm-calculator

Last edited by TUTS 59; 07/28/2021 4:25 PM.

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1958 Viking 4400
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1960 Chevrolet C10
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'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane