O/D on or off when driving down the highway
I have always wondered when to use O/D and not to use it. I have a car, truck and MH. Today I found I drove on the highway for about 60 or so minutes with the O/D OFF. I wonder when it is appropri...
Forum Discussion
JIMNLIN wrote:
When my trannies TC clutch runs a lot unlocked or the tranny shifts up and down a lot I take it out of OD. Works with the car or my trucks.
This and other similar advice. If the transmission doesn't keep kicking out of OD and dropping back in, frequently, leave OD on. That's what we do with our E450. It has a four-speed called 4R100.
Newer Fords have a five- or six-speed with TOW/HAUL like the GM Allisons do. With those, just drive it in TH.
That's 'cause the TH transmission still uses Overdrive when it can. It just modifies its behavior under the assumption it's carrying a heavy load. This is a good assumption where an RV is involved.
