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Originally Posted by Kro1957
I have a F350 diesel manual transmission L-5, considered 6 gears correct?
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Yes, assuming your truck is a '99 or newer, then you have a ZF 6-speed manual tranny.
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On a previous F250 automatic I remember it is not recommended to tow in Overdrive.
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You remember wrong. If the F-250 was a '99-up Super Duty, then put the tranny in Drive and let the computer determine which gear you will be in - with a couple of exceptions I won't go into here.
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My F350 in the 5 (6th gear) is considered overdrive correct? Has the white dot on stick so I am guessing that indicates OD.
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I don't know what the dot means, but you have a 6-speed tranny with L = granny low, then 1,2,3,4,and 5th gears. 5th is an overdrive gear, but that doesn't matter. Choose whichever gear allows you to pull the load without lugging the engine, without concern to whether it's an underdrive, direct drive or overdrive gear.
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My guess without looking up the books is I need to tow in 4th gear? Or could I use 5th gear in optimal conditions.... I am not sure of the rear end on that truck, it is a dually.
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'99-up F-350 DRW came with either 3.73 open axle or 4.10 limited slip. Most that were not ordered as "work trucks" were ordered with the 4.10 LS. There is an axle code on the door sticker that includes tire size and PSI, VIN, year/month of assembly and other codes. Look up that code in the internet and you'll know which rear axle you have.
As a stick shifter, you know what engine lugging means.
NEVER allow the engine to lug before you downshift, but other than that use the highest gear you can use without lugging the engine. Else you MPG suffers.
More details about your tow vehicle are available on TheDieselStop.com. Look me up over there.
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