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Old 04-03-2014, 10:24 PM   #1
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Over Drive

In what situations do you take the overdrive off?

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Old 04-03-2014, 10:44 PM   #2
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High load like heavy towing especially up a grade less stress on tranny if you do direct drive not over drive

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Old 04-03-2014, 11:02 PM   #3
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"Direct" drive is od. In the 42rle the torque converter "locks" to the flywheel to eliminate the slipping action that allows the auto to work vs a clutch transmission. This is to eliminate the waste energy an auto loses when the engine/flywheel is spinning faster then the innards of your tranny. By turning it off your basically "clutching" for more power, it's the same concept as riding your clutch to get things moving in a manual. You turn it off any time you want more power without the chunky feeling of your torque converter locking and unlocking whenever you touch the prissy pedal. The clunk is more noticeable with more weight then what the transmission (torque converter) was meant to handle.
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Old 04-03-2014, 11:14 PM   #4
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Overdrive off when in 4 wheel dr. you shouldn't be going fast enough to need it.
overdrive off when ever you are pulling a hill or running in stop and go traffic and the trans is constantly shifting in and out of OD.
overdrive off when going down a long steep grade and you have to ride brakes to maintain or control speed.
These are just a few examples but basically the overdrive is to reduce engine speed when cruising at hiway speeds
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Old 04-04-2014, 08:48 AM   #5
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Quote:
Originally Posted by btoler View Post
In what situations do you take the overdrive off?
I turn OD off when I don't want to be in Overdrive, AND when I don't want the Torque Converter to unlock.

The OD off switch not only locks out OD, but it also prevents TC unlock in 2nd and 3rd (it locks up as soon as possible in the lower gears).

I end up using the OD OFF button mostly around town under 50mph.

I'm geared properly with 4.88s for 33s.
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Old 04-04-2014, 09:11 AM   #6
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I turn the OD off when climbing hills at nearly any speed and when decending long down hill sections of freeway to keep from going over the speedlimit without riding the brakes. I'm not propoerly geared (with 4.10's and 33's) so it comes off on it's own on most uphill sections, plus I live at 8700 ft so when I go uphill it's also at high altitude where the engine makes less power.
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Old 04-04-2014, 09:54 AM   #7
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NO direct drive is not OD direct drive has tranny front and rear locked together which can only happen when input shaft rpm is same as output shaft RPM which by DEFINITION is NOT overdrive

In manual trannys and many autos you have strongest front to rear tranny internal connection in direct drive which has nothing to do with TC or clutch as this is internal to tranny

So under maximum load you want maximum strength for minimum chance of damage hence I don't use overdrive towing very heavy load especially up a significant grade
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Old 04-04-2014, 11:12 AM   #8
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Originally Posted by btoler View Post
In what situations do you take the overdrive off?
I leave OD off until I hit 65 MPH on the highway. 4.88s with 35s.

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