Re: [MV] M-54 transmission upgrade

LSyman@aol.com
Thu, 21 Oct 1999 08:20:08 EDT

The M39 and M39A2 (five ton gas and multifuel) originally came with direct
drive 5th gear. The M39A1 and M809 (five ton Mack and Cummins) came with
overdrive 5 speeds with 5th being .75:1. I have seen multifuel w/ overdrives.
They will work. I have also had a gasser w/ a Fuller 10 speed which is .67:1.
That truck would bury the 60mph speedo. The Fuller is longer which requires
the transfer to be moved back a few inches.
Jeff
TacticalTruck.com

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