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Old 12-19-2011, 06:24 PM   #1
northerngmc
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Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
3:38 rearend speedo adapter

I picked up a 3:38 rear gear conversion kit for the original diff in my 59 GMC.

The dealer was unable to get the speedo adapter for this conversion. Has anyone who has changed an 55T diff to higher gears changed the speedo adapter to ensure the speedo is accurate?

The truck has the original 3 speed manual trans.

I am wondering how this adapter works, is it external to the trans?
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59 GMC 9314 a.k.a. Whoopee
68 C20 50th Anniversary a.k.a. The Rat

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1.61803 is one H of a lot better than 3.14159, no really it is!
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