Re: Is changing rear ratios worth it?
I have 4.10s or 4.65s on in my 64 GMC 1500. 55 is around 2500. I have found that the best cruising RPM for my 305E is 2000. 2500 sounds like its screaming. I tow and haul loads with my GMC so I'm gonna leave the ratio as is for ease of taking off and ease of load on the engine. But if I ever get tired of the mileage I'll see about converting to an NV4500 if possible.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
My youtube channel aka Military Chevy:
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