Is the 6-speed auto in the '08-'09 H2 an Allison? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 06-03-2009, 07:27 AM   #1 (permalink)
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Is the 6-speed auto in the '08-'09 H2 an Allison?

Started looking at buying a used H2 and it seems the '08s and newer have quite a few upgrades compared to pre '08.

Just wondering if the 6-speed auto they're using behind the 6.2L is the same transmission they use behind the Duramax in the 3/4 and 1-ton pick-ups.
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Old 06-03-2009, 07:48 AM   #2 (permalink)
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Quote:
Originally Posted by RgdL View Post
Started looking at buying a used H2 and it seems the '08s and newer have quite a few upgrades compared to pre '08.

Just wondering if the 6-speed auto they're using behind the 6.2L is the same transmission they use behind the Duramax in the 3/4 and 1-ton pick-ups.
No it's not an allison.

I believe it is the 4L80E.
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Old 06-03-2009, 10:49 AM   #3 (permalink)
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No it's not an allison.

I believe it is the 4L80E.
A 4L80E is 4 speed [hense the 4], it's a 6L80E.
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Old 06-03-2009, 04:38 PM   #4 (permalink)
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Quote:
Originally Posted by RgdL View Post
Started looking at buying a used H2 and it seems the '08s and newer have quite a few upgrades compared to pre '08.

Just wondering if the 6-speed auto they're using behind the 6.2L is the same transmission they use behind the Duramax in the 3/4 and 1-ton pick-ups.
Alpha H1's are the only Hummers that get Allisons. I don't think they are even making Alpha's anymore. 6L80 is what is in the new H2's still a very good transmission.
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Old 06-03-2009, 05:08 PM   #5 (permalink)
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If it is 6.2 powered then it is the 6L80E found in most 08-up trucks. great combination and very durable

Last edited by Black06; 06-03-2009 at 05:09 PM.
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Old 06-10-2009, 12:18 PM   #6 (permalink)
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Sure would be nice to get that 6L80E in my 03 H2. I like the paddle shifters too! Would make shifting on the trail much nicer than having to move the sledgehammer of a shifter on the center console. While it looks really great its no so much fun running through the gears on it.
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Old 09-29-2009, 03:01 PM   #7 (permalink)
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I believe its a 6l90e. The last of the heavy four speeds were 4l85e's before the six speed came out. cant see then dropping the gross vehicle weight rating on the newer bigger tranny...
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