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need more speed

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Send your VIN to the Mack Museum with a donation and they can get the build records for your truck which will say which transmission and rear end ratio the truck was built with.

What is the current top speed?  Two ways to go would be to get an overdrive transmission for the truck or to up the rear gear ratio.


It doesn't cost anything to pay attention.

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The ol 673 will run on the governor all day(been there for lots of years).

Look on the drivers side of the transmission for a flat spot that will have the transmission code on it.  Same with rearend.  Won't be hard to figure out what road speed you have.



1959 B61 Liv'n Large......................

Charter member of the "MACK PACK"


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