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  1. #1

    Default aftermarket transmission?

    Are there any specialty tranny places that make 6 speed tranny's for the 6.0??
    I know they offer them for the diesels. Why not for the gasser?
    With my 4:10 rearend, she runs 2250 rpm at about 60mph.
    It just gets old having an 04 -sharp-truck and being passed on the highway by Yugo's.
    A 5speed with an overdrive seems to make sense.
    I would think with speed limits of 70mph, they would make the truck run that speed at the most efficient rpm range...........2500-2600 is NOT very efficient on these pigs.
    Just curious. Mark

  2. #2

    Default

    Quote Originally Posted by jbhofc View Post
    Are there any specialty tranny places that make 6 speed tranny's for the 6.0??
    I know they offer them for the diesels. Why not for the gasser?
    With my 4:10 rearend, she runs 2250 rpm at about 60mph.
    It just gets old having an 04 -sharp-truck and being passed on the highway by Yugo's.
    A 5speed with an overdrive seems to make sense.
    I would think with speed limits of 70mph, they would make the truck run that speed at the most efficient rpm range...........2500-2600 is NOT very efficient on these pigs.
    Just curious. Mark
    The new Caddie Escalades w/ the 6.2L gas engine have the 6spd. You also get the 6spd in the 2500 and 3500 HD trucks( Hydramatic w/ 6.0L gas engine and the Allison w/ 6.6L Duramax ).

    GM was supposed to release the 6spd for the Silverado and Sierra 1/2 tons for 08 models( 5.3L anyway - not sure on 4.8L but probably ), then it was pushed back to 09, and who knows when if ever it will come now? I agree the 4spd is outdated. A 5spd would be better. I will reserve judgement on a 6 spd however until I drive one as I believe it will constantly shift. I wager that is why it has not come yet and has been pushed back 2-3 times already.

    Unfortunately, as the shifting is all computuer controlled on both the new trucks as well as your 04 I doubt you would be able to swap a 6spd in. Maybe.

  3. #3
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    Default

    The denali also comes with the 6spd so you should be able get one.

    KRIS
    2007 GMC Sierra CrewCab 4.8L
    Tinted Windows, 20" Chrome MB Predators on 275/55/20 Copper AT's, GM Bed Rug, Speed Scene Chrome Grille, Putco Chrome Handles, Hypertech Max Energy Programmer, Magnaflow Muffler and many more mods to come.
    Former GM Vehicles:
    96 Chevy Camaro. My first car modded for a High School kid.

  4. #4

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    Sorry, forgot to mention. Mine a Manual 5 speed.
    Just looking for one more gear for the highway. Wanting to knock the rpms down when I'm NOT hauling or towing.
    Thanks Mark

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