84 GMC C2500, V12 powered - The 1947 - Present Chevrolet & GMC Truck Message Board Network

steemin_ehman · 10-14-2010, 08:54 AM

Theres a plastic gear drive system adaptor to replace the electronic speedo sensor. you remove the tailshaft housing, pop off a retaining clip, remove the stuff for the electronic speedo, and install a plastic gear style one in place. Very simple to do, the hardest part is knowing whether you need a 34-39 series, or 40-45 series.

40-45 series:
http://www.bowtieoverdrives.com/cata....php?ITEMID=14

34-39 series:
http://www.bowtieoverdrives.com/cata....php?ITEMID=19

Bowtie Overdrives is a good place to get information and parts. You can also get different speedo gear ratios to factor in rear end ratio, tire diameter, etc to make your speedo accurate.

10-14-2010, 08:54 AM	#10
steemin_ehman False Lies Join Date: Feb 2006 Location: Esterhazy, SK Posts: 305	Re: 84 GMC C2500, V12 powered Theres a plastic gear drive system adaptor to replace the electronic speedo sensor. you remove the tailshaft housing, pop off a retaining clip, remove the stuff for the electronic speedo, and install a plastic gear style one in place. Very simple to do, the hardest part is knowing whether you need a 34-39 series, or 40-45 series. 40-45 series: http://www.bowtieoverdrives.com/cata....php?ITEMID=14 34-39 series: http://www.bowtieoverdrives.com/cata....php?ITEMID=19 Bowtie Overdrives is a good place to get information and parts. You can also get different speedo gear ratios to factor in rear end ratio, tire diameter, etc to make your speedo accurate. __________________ Kyle (Steemin) Ehman -1979 Chevy CCLB, 6.7L Cummins swap - Project "RAMERADO" -2015 Yukon XL Denali (Family ride) -1977 Chevy stepside, carb'ed vortec 350 (SOLD) -Father of three daughters who will also have something cool...



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