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Re: A little speedo gear help needed please.
Quote:
Originally Posted by MikeB
Hey Ken, are you saying the truck is actually moving approx 10 mph faster than indicated by the the speedo at 25-35 mph?
If that's the case, you'll need to make the driven gear spin 30%-40% faster. So if you currently have, for example, 10/44, you will need to go to somewhere around 14/40 if I did the math right, and that's a big if. 
Also, I'd check actual vs. indicated speed at 30 mph and 60 mph and determine how far you're off percentage-wise. If it's 33% at one speed and 37% at the other, then try to get as close to a 35% ratio change as possible. Or if you do a lot of highway driving, then focus on the speedo being most accurate at 60-70 mph.
A good way to check actual road speed is with a free smart phone app. |
Thanks Mike. I had a Black and Yellow gear here at the house. The Black gear took care of my issue. I know I could fix it without going though all the jumping through hops and stuff. I simple calculator is all I need. Ken
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1985 IROC Z28 190HP TPI 305,700r4,T-tops,rear trac lock, Black on lite gray, 16in Z28 wheels
2007 Lexus ES350 (wifes)
1984 CJ7 with 1995 HO4.0L MPI, 2 1/2 OME YJ Lift
“There is no limit to the amount of good you can do if you don't care who gets the credit.”
― Ronald Reagan
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