What does the overdrive button do?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,734
Likes: 2,663
From: SE Florida
The OD OFF prevents the trans from shifting to 4th gear, which is overdrive. If it is in 4th gear when you press the button it will downshift to 3rd gear.
It also applies the coast clutch so that there is engine braking in 1st, 2nd, and 3rd gears. When the OD OFF light is not lit there is no engine braking in the lower gears.
It also applies the coast clutch so that there is engine braking in 1st, 2nd, and 3rd gears. When the OD OFF light is not lit there is no engine braking in the lower gears.
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Posting Guru
Joined: Jun 2005
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From: Amarillo, TX
The OD OFF prevents the trans from shifting to 4th gear, which is overdrive. If it is in 4th gear when you press the button it will downshift to 3rd gear.
It also applies the coast clutch so that there is engine braking in 1st, 2nd, and 3rd gears. When the OD OFF light is not lit there is no engine braking in the lower gears.
It also applies the coast clutch so that there is engine braking in 1st, 2nd, and 3rd gears. When the OD OFF light is not lit there is no engine braking in the lower gears.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
It will also cause ******* shrinkage. When that sucker starts blinking it could mean anyone or more of a 1/2 dozen problems.
Laughing Gas
Joined: Jan 2006
Posts: 1,045
Likes: 5
From: Gig Em, Tx
The OD OFF prevents the trans from shifting to 4th gear, which is overdrive. If it is in 4th gear when you press the button it will downshift to 3rd gear.
It also applies the coast clutch so that there is engine braking in 1st, 2nd, and 3rd gears. When the OD OFF light is not lit there is no engine braking in the lower gears.
It also applies the coast clutch so that there is engine braking in 1st, 2nd, and 3rd gears. When the OD OFF light is not lit there is no engine braking in the lower gears.
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Posting Guru
Joined: Feb 2006
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From: Wyoming
Anyone know why this button wouldnt work at all?? Mine doesnt seem to work and I really have no idea where to start.
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Elder User
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From: Charleston SC
Just a quick question about this statement...This coast clutch you mentioned, does this also keep the T/C locked as well? I wondered if you DO have an EBPV wired up as a brake, will pushing this button in before you start down the hill and close the valve keep the T/C locked down the hill? Just wondering. I have a DP tuner and the T/C locks up about 35 mph anyway...
Post Fiend
Joined: Sep 2006
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From: Millbrook Alabama
Your button could be bad, or atleast the wire through the shift lever may be chaffed. It is replaceable. I would start there, pull steering column cover, find the wire, and check with a multi meter.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,734
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From: SE Florida
No, it doesn't apply an engine brake. I wasn't clear enough.
It applies the coast clutch in the transmission so that when you are coasting the transmission will drive the engine, which causes braking. If the OD light is not on and the transmission is in 1st, 2nd, or 3rd gear the trans will freewheel and the engine will go to idle speed.
Pressing the OD button will not lock the torque converter, but you don't need the torque converter locked to provide engine braking.
You can push the OD button or downshift with the shifter at ANY speed. If you are going to fast for the shift to happen the computer will delay it until the truck slows down. I've put the shifter in 1 at 80 MPH. It immediately downshifts to 3rd gear, then when the truck slows enough it shifts to 2nd gear, and when it slows more it shifts to 1st gear.
It applies the coast clutch in the transmission so that when you are coasting the transmission will drive the engine, which causes braking. If the OD light is not on and the transmission is in 1st, 2nd, or 3rd gear the trans will freewheel and the engine will go to idle speed.
Pressing the OD button will not lock the torque converter, but you don't need the torque converter locked to provide engine braking.
You can push the OD button or downshift with the shifter at ANY speed. If you are going to fast for the shift to happen the computer will delay it until the truck slows down. I've put the shifter in 1 at 80 MPH. It immediately downshifts to 3rd gear, then when the truck slows enough it shifts to 2nd gear, and when it slows more it shifts to 1st gear.
Post Fiend
Joined: Mar 2007
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From: Texas
You can push the OD button or downshift with the shifter at ANY speed. If you are going to fast for the shift to happen the computer will delay it until the truck slows down. I've put the shifter in 1 at 80 MPH. It immediately downshifts to 3rd gear, then when the truck slows enough it shifts to 2nd gear, and when it slows more it shifts to 1st gear.
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