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07-31-2014, 07:08 PM
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Registered User
 
Join Date: Apr 2014
Location: Lafayette, LA.
Posts: 105
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Tach install and RPM's
hey guys i need some help figuring this out, i just pulled a 3 hole cluster out and installed a 7 hole with tach (all factory). and i have taking the truck out twice since the swap
and i cant figure out why my RPM's are reading so high on the tach on the way home i was going 35 MPH and the tach was around 3k in 3rd gear?? specs on the truck are... 350 / th350 stock converter 275/60/15 or 28" diameter i'm not 100% on rear gears but when i used a gear ratio calculator (here) even at 4.11 and 35 MPH it should be 1783 rpm any ideas and thanks for any help Chris 
__________________
"They Don't write songs about Hondas " 1972 C10 "Ole Red--blood, sweet & beers" USMC 1989-1997 1st Anglico 
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