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Old 04-11-2013, 09:39 AM   #1
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Gear towing question.......

I have a F350 diesel manual transmission L-5, considered 6 gears correct?

On a previous F250 automatic I remember it is not recommended to tow in Overdrive.

My F350 in the 5 (6th gear) is considered overdrive correct? Has the white dot on stick so I am guessing that indicates OD.

With my previous 5ver which was under 8k, I would use 5th gear only when on flat areas, no high headwinds, basicly if I felt the truck was not having to work hard. The 5ver honestly you never would know it was behind you it pulled so easily.

I have not towed this new KOTR yet but maxed out is 18k so more than double what I had previously. 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. Thanks Jim
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Old 04-11-2013, 10:06 AM   #2
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Quote:
Originally Posted by Kro1957 View Post
I have a F350 diesel manual transmission L-5, considered 6 gears correct?
Yes, assuming your truck is a '99 or newer, then you have a ZF 6-speed manual tranny.

Quote:
On a previous F250 automatic I remember it is not recommended to tow in Overdrive.
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.

Quote:
My F350 in the 5 (6th gear) is considered overdrive correct? Has the white dot on stick so I am guessing that indicates OD.
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.

Quote:
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.
'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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Old 04-11-2013, 10:26 AM   #3
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Great information!!! Thanks!!

My F250 was a 85 with a 4brl Holley. 351 Windsor. Automatic.

The F350 is a 7.3L 2002 Diesel, I just turned 60K on miles. I bet there is not another 2002 out there with that low of miles on it. Wife hates shifting it (short legs) ... Wants me to get another automatic. But this one is paid for and works like a horse!
GVWR 11200 shows axle 61 on plate.
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Old 04-11-2013, 11:13 AM   #4
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My F250 was a 85 with a 4brl Holley. 351 Windsor. Automatic
C5 tranny. That one may well have said to not tow in overdrive. However, I had a 1977 E-150 with that engine/tranny combo, and I don't remember any caution to not tow in overdrive. We towed a 3,000-pound tent trailer all over the USA with that van, and I always put it in drive and drove. We put about 150,000 miles on that van, including about 50,000 towing miles, and when we sold it to a friend there was nothing wrong with either the engine or tranny.

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shows axle 61 on plate.
61 = Dana 80 Conventional (without limited slip) Differential with 3.73 ratio

2002 F350 duallys
61 = open - 3.73
F2 = Limited slip - 4.10

All 2002 F-350 DRW pickups with diesel engine had Dana 80 rear axle with either 61 or F2 axle codes. Nothing else was available from Ford.
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Old 05-14-2013, 07:30 PM   #5
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Towed up to our CG spot in SD. 30 - 40 mph headwinds. Towed well until higher winds came up. 65 was no problem. In calm winds could cruise at 75 I am certain but 65 is a safe speed. Turbo was in the 3-5 range and exhaust was 900 to 1000
RPM's at 2k But what a diff between a 10k 5r and a 18k.
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