In <s3019fd4.018@holycross.edu>, Kenneth Scott wrote:
>I have a 1977 MGB roadster which I purchased without an overdrive.
>I lucked out and got an overdrive&tranny for $325. Installed it and
>it worked fine. Speedometer is right on. My question is: Why do I
>see references to changing speedometers when switching to overdrive
>unit? If you fit an overdrive unit of the same vintage as the
>vehicle shouldn't the speedometer be OK? Was I just lucky?
>Inquiring minds want to know!
>
>From 1974 1/2 on the drive gear and speedo ratios were changed so as
to be identical for both non-OD and OD cars. Parts rationalization--I
love it! And it only took 11 years!
A. B. Bonds
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