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Old 04-15-2009, 12:36 AM   #1
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What does the overdrive do?

When the overdrive light on the button is on does that mean that overdrive is off? or on? Also what exactly does overdrive do and when should It be used? Also did the 2006 models come with a 5speed transmission or 6?
Thanks

oh and this pertains to a 2006 auto I-6

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Old 04-15-2009, 02:35 AM   #2
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When the light it on, I'd imagine that the OD is ON.

What it does is lock up the torque converter and drops the RPM's of the motor and reduces heat from the torque converter slipping. This is a great thing to use on the highway.

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Old 04-15-2009, 07:20 AM   #3
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when the OD light is on the OD is off. overdrive pretty much acts as a "fuel saver." it shifts the transmission into the next gear while the RPMS are lower which saves fuel. people usually turn OD off while towing for more torque and better acceleration. i always leave my OD on b/c fuel economy is more important to me than better acceleration.
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Old 04-15-2009, 08:07 AM   #4
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Do you turn it off when wheeling? Does it turn off itself when the transfer case is in 4hi or 4lo?

Thanks, Billy
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Old 04-15-2009, 08:44 AM   #5
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i never turned it off on my tj while wheeling. i don't think it really matters if it is on or off while wheeling. theoretically it shouldn't even engage off-road.
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Old 04-15-2009, 09:57 AM   #6
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if you hit the button and the light comes on, you've turned it off. it's not automatic.

i turn it off when i'm wheelin' and leave it on when i'm not.
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Old 04-15-2009, 10:08 AM   #7
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Overdrive is an extra gear that lowers the engine RPMs on the highway for better fuel economy. The transmission has 3 forward gears plus overdrive, which gives it 4 gears (aka 4-speed) in effect. Overdrive is programmed so it will only come on at highway speeds, it will never come on at typical offroad speeds. The overdrive system really has no control over the lock-up torque converter which has a mind of its own, it locks up before the transmission shifts into overdrive.
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Old 05-25-2009, 09:52 PM   #8
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Originally Posted by Jerry Bransford View Post
Overdrive is an extra gear that lowers the engine RPMs on the highway for better fuel economy. The transmission has 3 forward gears plus overdrive, which gives it 4 gears (aka 4-speed) in effect. Overdrive is programmed so it will only come on at highway speeds, it will never come on at typical offroad speeds. The overdrive system really has no control over the lock-up torque converter which has a mind of its own, it locks up before the transmission shifts into overdrive.

Jerry, with that said, I have a 2004 Unlimited with 4 speed auto, and at 45 mph OD shifts in, RPM drops to 1250-1300 then I get a vibration. Have had it for years dealer cannot figure it out nor can I. Is it possible that extra gear is out of round or is on a bad bearing when engaged casuing the vibration? Just a thought, sorry to Hijack this thread not intending too
Vibration sloooowly goes away as I acclerate up and past about 55 (RPM then up to 1700+)
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Old 05-25-2009, 10:29 PM   #9
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My '04 does the same.... If pulling anything, I turn OD off until I get up to speed. Otherwise, I don't mess with it.
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Old 05-26-2009, 10:52 AM   #10
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well it wont lock up before a shift because then it would shift super hard belive me i have been in a car that did the lock up is designed to lower rpms, just not as much as the overdrive the reason you might want to turn it off is if you feel it going between overdrive and thrid way too much. This can happen a lot when you are pulling something or going up a large hill. If it is switching between those grears a lot it is very hard on the tranny so i would watch for that but yeah dont worry about it unless you do that because sometimes even when driving in town it will shift into overdrive that will save you mpgs that normaly were lost in a automatic
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Old 05-26-2009, 12:01 PM   #11
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Originally Posted by unlimiter View Post
Jerry, with that said, I have a 2004 Unlimited with 4 speed auto, and at 45 mph OD shifts in, RPM drops to 1250-1300 then I get a vibration. Have had it for years dealer cannot figure it out nor can I. Is it possible that extra gear is out of round or is on a bad bearing when engaged casuing the vibration? Just a thought, sorry to Hijack this thread not intending too
Vibration sloooowly goes away as I acclerate up and past about 55 (RPM then up to 1700+)
1250-1300 is a very low (too low) rpm to accelerate from, perhaps that "vibration" you're hearing/feeling is the engine lugging from the rpms being too low while trying to accelerate. Are you still running the stock size tires?
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Old 12-30-2009, 11:02 AM   #12
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I often drive my Jeep in the mountains, so the OD is off. Even driving N on the Interstate (I-15), the transmission shifts in and out of OD too often.

Has anyone found a way to rewire the overdrive so the default is OFF instead of ON?
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Old 12-30-2009, 11:19 AM   #13
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As mentioned, when the light is on, OD is off. In the mountains and in town, I run with OD off a lot. My 4.0 doesn't like to be lugged. Play with your transmission, watch you tac and you'll see what is going on.
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Old 12-30-2009, 11:41 AM   #14
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CoolBreeze, When you start your engine, the OD is on, and you have to turn it off. Do you know a way to make it OFF when you start your engine? then turn it on when cruising on the flats?
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Old 12-30-2009, 11:52 AM   #15
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CoolBreeze, When you start your engine, the OD is on, and you have to turn it off. Do you know a way to make it OFF when you start your engine? then turn it on when cruising on the flats?
No I don't. I've owned electronic OD's since 1985 and its just a habit of mine to turn it off when I start up.
I'm sure someone has figured it out though
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Old 12-30-2009, 01:06 PM   #16
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Do you know a way to make it OFF when you start your engine? then turn it on when cruising on the flats?
This has been attempted MANY times by MANY people.
Some even tried to get dealers to do it and apparently it can't be made to be off when starting the Jeep in any way.
I imagine it's built into the Jeeps computer.
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Old 12-30-2009, 01:26 PM   #17
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It sounds like a challenge. I'll have to get the wiring diagrams and see if I can find a soultion.

Is anyone else interested?
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Old 12-30-2009, 02:32 PM   #18
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Without reprogramming the PCM or without an elaborate external circuit to simulate giving a momentary push on the O/D switch, I don't think this is a realistic goal to try to achieve. The O/D switch is not a simple on-off switch, it is only a momentary contact switch that signals to the computer to toggle the O/D on or off.
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Old 12-30-2009, 04:06 PM   #19
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Jerry, Do you now if the latch is no the switch, a relay or in the PCM? If it is a N/O Momentary, then a parallel momentary contact closure after start should work.
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Old 12-30-2009, 07:16 PM   #20
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There's a Jeep made with a OD switch?
My 01 doesn't have a switch. Or a light, it just shifts into it after I stay at a steady speed for a while.
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Old 12-30-2009, 09:49 PM   #21
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There's a Jeep made with a OD switch?
My 01 doesn't have a switch. Or a light, it just shifts into it after I stay at a steady speed for a while.
You sure it goes into OD and not just the torque converter locking up?
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Old 12-31-2009, 06:41 AM   #22
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There's a Jeep made with a OD switch?
My 01 doesn't have a switch. Or a light, it just shifts into it after I stay at a steady speed for a while.
OD was not available when my '01 was made. It had a 3spd automatic.
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Old 12-31-2009, 09:29 AM   #23
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You sure it goes into OD and not just the torque converter locking up?

Dunno, might be the converter locking up, I emailed Jeep and they said its a 3 speed trans, so that might very well be the case, I gotta check the type of torque converter it is, if it is a stall converter that will make my life easier on the highway than overdrive will.
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Old 11-23-2010, 02:09 AM   #24
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Jerry, with that said, I have a 2004 Unlimited with 4 speed auto, and at 45 mph OD shifts in, RPM drops to 1250-1300 then I get a vibration. Have had it for years dealer cannot figure it out nor can I. Is it possible that extra gear is out of round or is on a bad bearing when engaged casuing the vibration? Just a thought, sorry to Hijack this thread not intending too
Vibration sloooowly goes away as I acclerate up and past about 55 (RPM then up to 1700+)
I have the same problem with my 04 sahara 4.0 auto with overdrive. Factory 30 inch tire package and 33k miles. The only remedy I have come up with is only using overdrive on the highway (55 mph+). Has anyone ever tried changing the shift points VIA a programmer of some type. I know it wouldn't fix the vibration but would it be possible to to keep OD from kicking in until a higher RPM or speed, just a thought.
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Old 11-23-2010, 06:24 AM   #25
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My 06 came with a 6 speed
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Old 11-23-2010, 08:15 AM   #26
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I would only us it on the high way or if you towing try it on the high way you will feel the difference going up a hill
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Old 11-23-2010, 08:33 AM   #27
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Jerry, with that said, I have a 2004 Unlimited with 4 speed auto, and at 45 mph OD shifts in, RPM drops to 1250-1300 then I get a vibration. Have had it for years dealer cannot figure it out nor can I. Is it possible that extra gear is out of round or is on a bad bearing when engaged casuing the vibration? Just a thought, sorry to Hijack this thread not intending too
Vibration sloooowly goes away as I acclerate up and past about 55 (RPM then up to 1700+)
the vibration you speak of is very characteristic of the 42RLE auto. theres also usually a drone sound associated with it. thats the engine bogging down, or lugging, because the 42RLE's overdrive ratio sucks balls.

the 42RLE is really a poorly matched transmission to the 4.0L. it sucks too much power out of the 4.0L, and seems it needs another 40hp/ft-lbs. the gear ratios are too wide, and it needs another gear between 2nd and 3rd. worst of all, the OD needs to be 0.75 instead of 0.69.

the dealer can't figure it out because they can't see beyond their FSM.

the only solution to try to "fix" the 42RLE is gears. you need to gear the crap out of the axles to compensate. 4.56s with 31s, 4.88s with 33s, 5.38s with 35s, etc. and gears don't fix the 42RLE, they just make it behave more tolerable. the really big problem is the TCM programming is horribly conservative for gas mileage, but there is no tuner/chip that can adjust the shift points on an OBDII TJ.

jeep knowingly installed a crap transmission behind the 4.0L because thats all they had - "just everyone elses parts"...its actually a front wheel drive transmission, thats supposed to be behind a V6 high reving engine in a minivan or car. AKA-something aerodynamic that gets good gas mileage. Due to CAFE regs at the time, they had to gear the 42RLE/4.0L like crap so it would pass the terribly inaccurate mileage tests on the dyno in the lab.
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Old 11-23-2010, 04:09 PM   #28
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You sure it goes into OD and not just the torque converter locking up?

Hey I totally forgot about this thread, I found out I have a stall converter it locks up between 33 and 35 mph. Its a low stall theres no high stall, I'd love to have an old low high stall from a Chrysler 904
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Old 04-06-2012, 10:34 PM   #29
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So then 2001s came with different transmissions cause my 2001 has a five speed (forward) and no OD switch that i can find
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Old 04-07-2012, 12:26 AM   #30
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Holy thread revival.

They are talking about the 42rle Automatic 4 speed overdrive tranny in the 2003-2006 TJ. The button they speak of is the OD off button on the dash by the ashtray.

Previous years had the 3 speed auto.

Yours is a stick.

Did you read the thread? lol

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