12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

Overdrive Switch

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Old Jun 20, 2009 | 10:44 AM
  #1  
Blueburner's Avatar
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Diesel Fan
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From: Fort Worth, TX
Default Overdrive Switch

I used my overdrive off switch for the first time last night and was a little confused by how the truck reacted. I was not towing anything, but I expected it to just unlock the torque converter. Instead it took the transmission down to third gear and would not let it shift into fourth before lockup. Is this right or am I just crazy? If it's not, how would I go about fixing it?

Thanks,
Ryan
 
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Old Jun 20, 2009 | 12:16 PM
  #2  
BigDiesel359's Avatar
Diesel Wrench
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From: PEI
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That's how it works. It does not unlock the converter. The way the transmission shifts is 1-2-3-TC lock-up - OD. So, obviously if you switch it to OD OFF then you will be in 3rd with the TC locked.
 
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Old Jun 20, 2009 | 12:17 PM
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From: Gloucester, VA
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Yeah thats right. Overdrive off keeps teh truck out of 4th gear. Locks it out so all you will get is 3rd gear locked up.
 
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Old Jun 20, 2009 | 12:39 PM
  #4  
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Thanks guys, glad to hear it is working the way it should

Ryan
 
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