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I have a 1991 mack dm 690s with a mechanical em7 engine.   It has an overdrive eaton fuller 8ll which i installed years ago and 4.42 gears that also i install years ago.  Tires are 22.5 on the steel wheels that have the wedges.   I have a parts mack that has alum 24.5 wheels and 4.17 gears.  I also have an eaton fuller 8ll tranny that isnt an overdrive.  My question is which of the setups will run the faster speed.  The dm like it is now or if i switch out the three items ...tranny gears and tires

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The "8" series is only rated to handle @ 800 lb/ft of torque from an engine. Likely only has a  inch and three quarters input shaft (?)  I don't think it's a good choice for the truck you want to use it in. 

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i bought it used from a guy local     it was in a tandem or tri axle dump as well but it may have originally been a road tractor      not sure     can the input shaft be switched out ?        or is there a lot more to it than just that?      he told me he wasnt keeping it for a back up tranny for other trucks because it wasnt an overdrive         said truck had like 3 something gears in it

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