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
RVER wrote:
Thanks, did I do damage to drive with it off?
No of course not.
If you watch your tach, you will notice that OD increases the gearing just slightly and your engine runs 200-300 RPM faster without it.
OD is intended to help with gas mileage, mostly. YOu could run with it OFF all the time if you choose. In some unusual circumstances your gas mileage can actually be better with it off all the time.
