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  #1  
Old 04-22-2008, 11:05 PM
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2003 Hummer H2
 
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Default '08 6 speed auto's fit 6.0l's?

Was reading about the 08 H2's and it said they have a 6 speed auto backing the 6.2l. Will the new tranny fit older models?

MikeH
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  #2  
Old 04-23-2008, 02:13 PM
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Default RE: '08 6 speed auto's fit 6.0l's?

It will FIT but will not get it to shift. The 08 and 07 vehicles use a totally different electronics system. The 6l85E trans can be used on an 07 Cadillac Escalade because in 07 Cadillac started using the new electronics.

So as far as putting the 6l85E in lets say an 05 Hummer - NO GO.
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Last edited by jaydcc69; 02-10-2011 at 11:20 AM.
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  #3  
Old 05-13-2008, 08:36 PM
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Default RE: '08 6 speed auto's fit 6.0l's?

This place says they're working on a controller for the 6L80E http://www.powertraincontrolsolutions.com
wonder how long it will take? and how it will work.
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1993 Thunderbird SC 5 speed (transplanting a T56 6spd)
want a H1
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  #4  
Old 05-13-2008, 09:12 PM
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Default RE: '08 6 speed auto's fit 6.0l's?

Ummm the H2 uses a 4l65E not a 4l80. The new 6speed Has the same casing with gear ratios that are a little bit differnet. Essentially It uses the 3 gears in the engine and teams 2 of them withthe over drive taking it from a 4 speed to6 speed. Physically yes it will fit. But It would require some software work to make it work with the older engine. The only reason I know anything about this is by father in law owns a tranny shop and we talk about this all the time.
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1998 HMCO; Rubberduck Big Duck lift, 42" Pitbull Irocks on beadlocks, Auburn f/r lockers, MM 12kwinch, 12K halfshafts Rubberduck Packrack, RD hydro assist steering......Vision X, Ridgid lighting etc..... to much more crap to list....my wife hates me lol
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  #5  
Old 05-14-2008, 07:50 PM
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2003 Hummer H2
 
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Default RE: '08 6 speed auto's fit 6.0l's?

As stated on the Hummer.com web site under H2 DETAILS-FEATURES & OPTIONS "TRANSMISSION: Hydra-Matic 6L80 6-speed automatic".
07 and earlier use the 4L65.
As my earlier post stated that powertraincontrolsolutions.com were working on an electronic controller for the 6L80 that would allow it to work no matter the PCM/ECU format.

Could you plug an '08 ECU into an earlier vehicle and have it work? Who wants to try?.......[8D]
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2014 RAM 3500 Mega Cab Dually
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1993 Thunderbird SC 5 speed (transplanting a T56 6spd)
want a H1
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  #6  
Old 05-14-2008, 08:25 PM
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Default RE: '08 6 speed auto's fit 6.0l's?

Opps my bad I did not realize that.
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Eric Sitterle
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Former Director THCI
esitterle@gmail.com

1998 HMCO; Rubberduck Big Duck lift, 42" Pitbull Irocks on beadlocks, Auburn f/r lockers, MM 12kwinch, 12K halfshafts Rubberduck Packrack, RD hydro assist steering......Vision X, Ridgid lighting etc..... to much more crap to list....my wife hates me lol
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  #7  
Old 01-02-2013, 12:55 PM
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Default

Know that this is an ancient thread but curious if anyone has ever swapped the transmissions?
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Old 01-02-2013, 12:55 PM
 
 
 
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2003, 4l65e, 6l80e, 6l85e, auto, controller, fit, gear, h2, hummer, put, ratios, sale, spd, trans, transmission


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