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1994 Mack MR690s...Detroit engine 350 hrsp...only getting 80 hour on hi way ?

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Hi Trevor:
A lot of these older trucks were built for work not speed.
If you're in the top gear at the high end of your engine RPM range, that's what you get for speed. I have a 1980 Ford Louisville that can onle hit 80 KM going downhill.
Love that old iron!

Posted on Mar 28, 2015


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Posted on Jan 02, 2017


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