5.9l g56 transmission same as 6.7l g56? - Dodge Cummins Diesel Forum
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post #1 of 6 (permalink) Old 12-20-2011, 07:55 AM Thread Starter
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5.9l g56 transmission same as 6.7l g56?

I'm wondering if the g56 behins the 6.7l is the same as the 5.9l? I found a very badly wrecked 2008 that I may buy to do a 6 speed swap on my 98.

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1998-2500 quad-cab- long bed. Goerend built auto. Airdog 165, 4" exhaust, afc mods/ tst spring. 3k rpm springs.
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post #2 of 6 (permalink) Old 12-20-2011, 04:01 PM
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Physical dimensions are the same, ratios inside are different (better). You'll have a better overdrive and a little more reasonable 3/4 split with the 6.7L version of the G56, if memory serves.

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post #3 of 6 (permalink) Old 12-20-2011, 08:26 PM
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Yeah, I think it's the 08 and later trans that has the better ratios. Can't remember the code off hand

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post #4 of 6 (permalink) Old 12-20-2011, 11:05 PM
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Fifth gear is the same on both, the g-56r used in 2008 and later has a .74 6th gear as opposed to the regular g-56 with a .79 6th gear.

05.5 2500 slt 4x4 QCsb g56- Spec ST dd, 6" BDS la, some Carli stuff, Toyo MT 37's, Diprocol/Isspro, Smarty, AMP, Stainless Diesel, Fluidampr, Crazy Carl, FMW62/476 on the way... A bunch of other stuff...
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post #5 of 6 (permalink) Old 12-21-2011, 10:22 AM
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Make the change best investment i made 1thing you notice is will need to bring rpms up more in 5th to grabe 6th under load. I belive what read most gears have diff. Ratio i know 5th is diff in mine which i like for when real heavy load i can run 5th with lower rpm.

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post #6 of 6 (permalink) Old 12-21-2011, 04:49 PM Thread Starter
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Ok thanks guys that's what I needed to know. I gotta do something with this stock slushbox that's in my truck now.

1998-2500 quad-cab- long bed. Goerend built auto. Airdog 165, 4" exhaust, afc mods/ tst spring. 3k rpm springs.
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