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**MJN** · 03-22-2021, 08:50 AM

I'd go with the ratio adapter (the little gearbox that mounts to the transmssion) you can either find them used and cross the numbers to the chart within the GM parts catalog or have a custom one made. I had to have a custom adapter for my K20 made to get the speedometer correct- Transmission Center was awesome to work with and they had great customer service. On mine its driven off the NP205 transfer case but same idea with the SM465.
https://transmissioncenter.net/?prod...edometer-gears

03-22-2021, 08:50 AM	#3
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,096	Re: Sm465 Speedo gears or adapter? I'd go with the ratio adapter (the little gearbox that mounts to the transmssion) you can either find them used and cross the numbers to the chart within the GM parts catalog or have a custom one made. I had to have a custom adapter for my K20 made to get the speedometer correct- Transmission Center was awesome to work with and they had great customer service. On mine its driven off the NP205 transfer case but same idea with the SM465. https://transmissioncenter.net/?prod...edometer-gears __________________ '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