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Old 10-12-2020, 09:18 PM   #19
dennislbrooks
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Join Date: Feb 2004
Location: Williamsburg, Ohio
Posts: 1,765
Re: 1959 GMC Fleet - 2wd to 4wd

I have the speedometer hooked up to the transfer case, it works, but way off. The drive gear is blue - 18 tooth -- and the driven gear is 36. The transfer case must have been under a truck with a 3.42 or 3.23 gear.

I get my speedo gears from LASpeedometer and Gear and the best we can do with that drive gear - 18 - is a 45 driven gear/w housing. Will be close -- just not quite there unless I can get a true 31 diameter tire. My 31x1050's are a little less than 30" now. I run 3.73 gears. Or put a set of 32's on it. Then need more money and maybe engine. 8-)

If I ever have reason to split the transfer case again I will change the blue 18 to a tan 15 then I can run a 36, 37, 38, or 39 for a more accurate speed.

Anyone know how to get the tail housing off the np208 while in the truck??? I think it needs to be removed then split and the tail housing tapped out from the inside.
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1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T

Last edited by dennislbrooks; 10-13-2020 at 05:47 AM. Reason: words
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