Re: [VAL] To overdrive or not to overdrive...

["Chris Koehn" <timberguides@xxxxxxxxx>]

As Bob writes this is vehicle specific. It's generally considered bad 
to allow any vehicle's transmission to frequently jump in and out of 
OD. My 2000 Ford PSD (7.3 liter, 373 gears) tends to do this when 
towing at ~40-45 mph or when cycling through a series of hills. When 
this occurs I turn off the OD.  It's important , however, to remember 
to shift back in to OD when conditions improve. Red lining the vehicle 
for an extended period is way worse than gear jumping.

Chris Koehn
1979 International Sovereign @ 31'
139K miles on the PSD with no engine or tranny trouble