6.7L Cummins Forum

My transmission does not shift into 6th gear for quite some time when the engine is cold and outside temperature is 25 degrees or less. Letting up on the throttle does not seem to help. Does the engine need to be a certain temp before shifting into high gear. I live about 1 mile from the interstate and don't like the high rpms to maintain speed. Any info? Still under warranty. Just haven't had time to take it in yet. Thanks.

My does the same thing when it's cold. Does not seem to be a problem.

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2008 Dodge 2500HD 6.7L 4X4 Laramie
Edge insight, Amp tailgate step, 4" Boss Bars, rear air bags with compressor, spray in bed liner

I have experienced the same issue during cold weather of 25 degrees or below. I posed a similar question in another thread versus warming up the truck. The consensus seems to be to drive the truck cold, because warming up the truck will result in an increase in soot. I've looked throughout the internet, but cannot find anything to idicate that this is normal function, but I would think it would be a normal means of warming-up the truck and its fluids.

I think I read some where that this was a normal condition. It will allow the temp to rise in the transmission fluid before allowing it to shift into 6th. Mine does it also.

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07.5 3500 Quad, SRW, 4X4, Laramie, Leathered, Dark Metallic Gray, 6.7, 68RFE, 20K Reese, Ride Rite's, 2 Viair air compressors, Bully steps, Kleinn Locomotive air horns (there was 2 and now there are 5), Billet polished locking fuel door, 'A' pillar mount Auto Meter Pryo, PML X-deep trans pan (Yet to be installed)
06 Durango 285 RL 5'er Lifted by KZ
96 2500, Ext, 4X4, V-10 Gasser @ 400 HP, Gibson 3" single Exhaust, Ride Rite's, 285 Bridgestones, 170,000 miles, Faded Green, Carr steps, Brush Guard, 2 - 385K CP KC Daylighters, Dual Batteries, On board Air system

Thanks for the feed back

Thanks for the info

This is normal. The transmission will not shift into 6th gear until it is up to operating temperature.

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2007 Ram 2500 QC 4x4 SLT TRX4-Offroad 6.7L Automatic. '08 Jeep WK 3.0L diesel-wife's DD.
1998 Jeep ZJ 4.0L Automatic Selectrac-project for our son. '98 Jeep XJ-my wife's former DD.
1965 Dodge Polara 880 Convertible 383 Automatic.

Yes your temp on the trans needs to be higher than 60 Deg F before it will shift into 6th gear. Thanks to the Edge for this info.

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Winger
2008 2500 Silver 4x4 6 Speed Auto Big Horn Edition Volant CAI Magnaflow Muff Edge w/ Attitude
1990 Honda GL 1500 Wineberry 125,000 Miles
2005 Honda GL 1800 Candy Blackcherry 50,000 Miles

Yup, that's what my edge says too.

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10

Yea, mines does the same thing, but that's the case with the 5.9 also, it's just cold