engine "sweet spot" for mileage/auxiliary trans. results?

engine "sweet spot" for mileage/auxiliary trans. results?

08-13-2003, 10:39 PM

#1 (permalink)

cfarrar

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Join Date: Nov 2002 Location: Norwich, KS Posts: 58 Photo Gallery

engine "sweet spot" for mileage/auxiliary trans. results?

I really have two questions here. I would be interested to know what the engine speed for best mileage is for our trucks. I would think that dropping cruising rpm would help. I am also familiar with the auxiliary gearboxes (Gear Vendors, U.S. Gear, etc.) that would do that. An auxiliary transmission would introduce some extra power losses through friction, too, that would cut into the gains. Has anyone documented results with one of those in our trucks behind the automatics or the Getrag?

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1998 12-valve reg. cab 4x4: 5-speed, 220K miles, mostly stock

Early '91 D350 Reg. Cab LE 4x2: Getrag, 3.54, 3" mandrel-bent exh., rebuilt pump and injectors, 16-cm., homemade/Amsoil bypass oil filter 250K+ miles

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