Pros, Cons and Fuel Mileage of the 6.7? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 12-20-2012, 08:35 AM Thread Starter
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Pros, Cons and Fuel Mileage of the 6.7?

2008 6.7L Automatic transmission.

What are some pros and cons about this truck, besides fuel mileage that some of you owners have?

Best way to get the most fuel mileage?

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #2 of 6 (permalink) Old 12-21-2012, 02:38 AM
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Originally Posted by BlowinSmoke View Post
2008 6.7L Automatic transmission.

What are some pros and cons about this truck, besides fuel mileage that some of you owners have?

Best way to get the most fuel mileage?
As far as the 68rfe auto, when towing keep it out of 5th and 6th gear if hauling any significant weight. I learned the hard way at 107k miles I burn't the OD clutch packs. I thought that when towing on the flat and with all the power the 6.7 puts out it didn't feel like it was working hard or lugging, and used OD to much. My tranny shop even recommends to keep it out of 5 and 6 gears (thats for all diesels)when in city driving even empty. Must newer trucks are programed to get in highest gear possible quickly even at low rpm's for better mpg. Problem is at those low rpm's the clutch pressure is low allowing slippage as soon as you try to speed up.

See this thread about my experience: https://www.thedieselgarage.com/forum...d.php?t=111259

I did add a Sonnax line pressure booster after the rebuild, it plugs into the tranny wiring harness and raises line pressure to clutches yet its not noticable to feel during shifts.

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2013 6.7 CTD 2500, 800 ft-lbs torque, 4x4 crewcab Larmine Longhorn edition, 6 sp. auto, 2 tone white/gold
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post #3 of 6 (permalink) Old 12-21-2012, 05:57 AM Thread Starter
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Would the G56 6 speed be any better?

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #4 of 6 (permalink) Old 12-21-2012, 07:07 PM
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I just bought an 09 with the 6 speed manual and love it, It drives great!

09 Dodge 2500 4X4 G56, not stock.
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post #5 of 6 (permalink) Old 12-21-2012, 08:03 PM
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I just bought an 09 with the 6 speed manual and love it, It drives great!
Still stock?

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2012 Ram 2500 Crew Cab Big Horn
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post #6 of 6 (permalink) Old 12-21-2012, 08:53 PM
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At this time it is, once I sell my 95 I will start tinkering with this one.

09 Dodge 2500 4X4 G56, not stock.
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