# Speedometer gear question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by HD, Feb 23, 2004.

1. ### HD1/2 ton status

Joined:
May 22, 2003
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Location:
Ridgecrest, CA
I just lifted my ’83 K5 and put 35” tires on. I have a NP208, were can I get the speedometer gear for the correction? Thanks for the help!

Joined:
Jul 22, 2001
Posts:
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Location:
Mesa , Arizona USA
I cant remember where I saw that thing on the gears, I need one too. They are listed somewhere and each one different color. I probably lost where I found it. In the meantime you could do this: multiply your old tire diameter by indicated miles per hour and divide by new tire diameter.EXAMPLE In my case lets say 45 mph in town ( I have 33's) 30.5 (old 31's) x 45 mph = 1372.5 divided by 32.8 (new 33's) = 41 mph. Do this equation for some common speeds and remember the speeds until you find speedo gear.

3. ### K5er4Life1/2 ton status

Joined:
Oct 16, 2002
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Location:
Bellflower, Ca
Bowtie overdrives has a calculator that will tell you the right gears needed to go in your T-cae to get your speedometer correct. Here is the web address, sorry I dont know how to make it clicky but I am sure somebody here will help with that /forums/images/graemlins/smile.gif, or just copy and paste it up in your web browser- http://www.700r4.com/speedoCalc/speedocalc.shtml

Joined:
May 30, 2003
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