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Unread 12-13-2012, 02:13 PM   #1
jock27
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1998 XJ Cherokee 
 
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dashboard query

see attached pic from my UK spec 98 Laredo, I have been informed that the button with the "D OFF" on it may be an overdrive off button but my question is...how and when should I employ it?
I originally posted this in cherokee forum not grand cherokee this button is not on XJ models

20121212_084411.jpg  
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Unread 12-13-2012, 02:32 PM   #2
WhiteOut
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It does indeed turn the overdrive off.

AFAIK, mostly used when towing. I have never towed anything with the Jeep, nor have I ever used the button.
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Unread 12-13-2012, 02:34 PM   #3
ratmonkey
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grand cherokee (zj and your zg) are quite different from the cherokee model(xj).

the button is actually OD off, it prevents the transmission from reaching 4th gear and allows the torque converter to lock in 3rd gear provided a few conditions of throttle and speed are met.

it is used when towing mainly, saves wear and tear on the transmission from running at high engine loads with the transmission in too high a ratio with the torque converter clutch unlocked. that creates a ton of heat in the trans.
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Unread 12-13-2012, 03:00 PM   #4
jock27
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thanks very much for that, most helpful, I'll just ignore it then...unless towing
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Unread 12-13-2012, 03:15 PM   #5
kg6mov
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I use it sometimes on windy roads when I want more control, it really helps the feel of things for some driving. My father would use it if he saw a highway patrol car to slow down without touching the brakes, not sure I'd recommend that trick, but it does work.
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Unread 12-13-2012, 03:24 PM   #6
PolkaPower
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Hills or towing.
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Unread 12-13-2012, 03:32 PM   #7
Insane_Jeep
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i live near mountains and i use it on high grades going down the mountains...it helps wear and tear on the brakes i pretty much don't have to touch the gas or brake all the way down
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Unread 12-13-2012, 05:39 PM   #8
jock27
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thanks for the tips guys.....I did wonder about the high gradient downhill stuff
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Unread 04-06-2013, 12:45 PM   #9
Zoot
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We have ridiculous mountains on Borneo, I use it when I am going inland where you have mountain after mountain after mountain... they don't understand switchbacks, just throw the road straight up towards the pass, if it gets too steep, put in a bit of a wiggle towards the top

There are plenty of 15%+ grades. Plays hell with the shifting. You are either pedal to the metal, or slow as a slow thing on a slow day.
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