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Old 12-20-2011, 07:55 AM   #1 (permalink)
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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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Old 12-20-2011, 04:01 PM   #2 (permalink)
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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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Old 12-20-2011, 08:26 PM   #3 (permalink)
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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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Old 12-20-2011, 11:05 PM   #4 (permalink)
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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.
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Old 12-21-2011, 10:22 AM   #5 (permalink)
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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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Old 12-21-2011, 04:49 PM   #6 (permalink)
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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.
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