73-87chevytrucks.com

General Site Info => General Discussion => Topic started by: weebo74 on April 05, 2009, 09:03:31 pm

Title: how to get the right speed
Post by: weebo74 on April 05, 2009, 09:03:31 pm

ok so here we go i got a 1979 k10 4x4 it has 35" tries got the truck about a month ago got the thing running right and put a new speedo cable and the truck is way off is there any way to fix this thanks for all the info

Title: Re: how to get the right speed
Post by: VileZambonie on April 05, 2009, 09:09:57 pm

More info about your drivetrain needed.

Title: Re: how to get the right speed
Post by: Lt.Del on April 05, 2009, 09:15:36 pm

every large town has a shop that works on calibrations.  Any tranny shop could calibrate it for you.  it is a common thing, anytime you change ratios, tranny type, wheel/tire size etc. 

Title: Re: how to get the right speed
Post by: bfofish on April 05, 2009, 09:41:40 pm

An old trick I was taught years ago, go out to the highway and time yourself between the mile markers.If it takes you 60 seconds you are going 60mph ect......
Then you at least have an idea how far off your speedo is.
I know my Blazer is off by 10 at 55mph with a 4" lift and 35" tires.
Your best bet is a tranny shop or 4X4 shop to get the correct speedo gear for your trans.

Title: Re: how to get the right speed
Post by: Irish_Alley on April 06, 2009, 12:22:36 am

mines off by 3 mph w 38's but i also got the digital gages and with them you turn them on and drive a mile or have another vehicle drive in front of you at a "known speed" and set it. that was pretty much the reason i was able to talk the wife into letting me get them lol

Title: Re: how to get the right speed
Post by: choptop on April 06, 2009, 11:14:18 am

I use my GPS. Just move it from truck to truck.