TOWING - OD or OD Off? - Diesel Forum -
Towing and Hauling Towing and hauling with Ford diesel trucks and vans.

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post #1 of 4 (permalink) Old 08-26-2010, 08:36 PM Thread Starter
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TOWING - OD or OD Off?

I HAVE A 95 F350 7.3 turbo A/T Crew Dually Diesel. Many plp have always said, "Oh you got to tow with OD off". But I have to run about 3000 RPM's to go 60 mph, So I don't, I tow with OD ON. A few days ago I found on page 284 of my F series Ford Book that came with the Truck, IT SEZ to TOW in OD if u have a computer controlled trans. E4OD or 4R7OW. If u are decending a steep hill to operate in Drive (?). I gues that menas outa OD. Is that what yall do, whata yall think.

'95 Crew Diesel Dually 7.3 automatic (147k 12/02/05) 199k 11/16/11, no cat, bigger DP I was told. "Don't put sides on your Shop, or the Ole Lady will want to store Furniture in it"
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post #2 of 4 (permalink) Old 08-26-2010, 08:55 PM
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As long as the transmission isn't "hunting" meaning going in and out of O/D, then leave it in OD. I know I have an IDI not a PSD, but the tranny is computer controlled in both. I asked the same question when I first got my truck and I was assured by many members here and the tranny GURU Mark Kovalsky, that it is fine to tow in OD.

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post #3 of 4 (permalink) Old 08-27-2010, 05:03 AM
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The transmission was designed to tow in OD. The manual tells you that you should. You can't keep up with traffic towing in D. People who know nothing about transmissions tell you to not tow in OD.

Seems pretty overwhelming to me.

Former Automatic Transmission Engineer 1988-2007

“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
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post #4 of 4 (permalink) Old 09-01-2010, 10:59 AM
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As above, I tow in OD until the transmission starts "hunting" on a hill, then I hit the button to lock out OD. We have some significant hills that I pull, the worst is an 8% 4-mile long grade. I hit it as hard as I can legally drive, then lock out OD when the transmission downshifts.

When speed drops, and it automatically downshifts to 2nd, I pull the lever down to second also, back off the throttle, and ride to the top.

Downhill on that section, I hit the top of the mountain as slow as possible, pull it down into 2nd, and use the brakes to keep my speed below about 45 mph. I'll let it run up to 45 mph, then brake hard to drop it to around 40 mph, let the brakes cool as speed picks up, and repeat.

King George
2007 F-350 XLT 6.0L
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