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Re: 5500 NAPCO front ???
I don't have any documentation for Napco stuff newer than 1960 but in my Napco parts book it shows a 6.17 ratio available for '56-57 1.5 and 2-ton trucks, no idea if they continued to offer this later on. For pickups Napco only offered one ratio; 3.90 for 1/2tons, 4.57 for 3/4tons and 5.14 for 1 tons.
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'51 South Bend Model "9A"
'56 Chevy 3600 NAPCO
'74 Chevy Cheyenne Super K20-restored on 37's
'72 GMC Sierra Custom K2500- in progress
'08 GMC Envoy Denali
'12 GMC Sierra 2500HD Denali
'17 GMC Yukon XL
VCCA member #58596
http://www.nohrco.com
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