I got a few questions about my new to me 99 F350 dually v10 automatic.
1) should I turn OD off while towing? I can't find anything that says to turn it off in the owners manual.
2) my truck has 3.73 rear axle ratio. Anybody have any experience with this gear ratio in a v10 like mine?
I have not pulled with the truck yet, I am not really sure what to expect going from a half ton with limited payload to a Dually with about 2 tons of payload and te same trailer. I am hoping for a test run tomorrow.
Oh the old truck had 3.55 but the new truck is much heavier.
PS. The dually did something to my wife. She has been looking at fifth wheels on Craigslist since about 10 minutes after I brought the truck home. Lol
You will get a range of opinions, but most will revolve around turning it off if your tranny starts hunting for gears back and forth. I have the 7.3 diesel pulling a 9K fiver, and it pretty much stays on all the time as it climbs without many issues, even in OD. It will drop down into 3rd on its own and stay there, so I just leave OD as is. Having a tranny cooler, add on tranny temp gauge as well as turbo temp reader helps me with decision making.
You're not going to hurt anything by "testing the waters."
Make a run with OD on, and see how it goes. If you can cruise right along in OD without the truck lugging badly or shifting frequently, leave it on.
Same goes with the 3.73 axle ratio. You're not going to hurt anything by trying it out.
People like to make out that there is a fixed formula for ALL towing. Well, there isn't. A 4.10 will always feel "more powerful" than a 3.73, but what if you've got plenty of power with the 3.73 as it is? Would you even know what you were missing if you kept the 3.73? Trying it out isn't going to cost you a dime.
Spending no money is a lot better than spending money you didn't need to, IMHO.
2001 35 ft avalon alpenlite RK
2005 3500 2wd duramax CC dually
trailair center point suspension
JT Strong Arm Stabilizers
KSH 55 inbed fuel tank
Induction Overhaul Kit
TST tire monitors