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Thread: switching to 6-spd auto transmission... possible?

  1. #1
    suckit
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    switching to 6-spd auto transmission... possible?

    Just out of curiosity what would it take (other than buying the transmission itself lol) to swap out my 4-spd auto for one of the 6-speeds? There are two right? The GXP one and the one from the 09.5 G6. 6T40 and 6T70.

    Which of those would be better, and how much work would it be to do that? I don't mean for me, I wouldn't attempt this myself. But let's say my transmission dies sometime in the next 5 years so I suddenly have the opportunity to put in something that can handle more torque. What would that involve?

    I thought about the manual but it seems like I'd be better off just trading in my car for one with a manual. I'm hoping since it would be an auto-to-auto switch that this would cost less and require less work.
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  2. #2
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    Re: switching to 6-spd auto transmission... possible?

    As far as we know there are just the two, the one for the 3.6L, and the one for the new 2.4L and V6.
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  3. #3
    suckit
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    Re: switching to 6-spd auto transmission... possible?

    Quote Originally Posted by WoodburyMan
    As far as we know there are just the two, the one for the 3.6L, and the one for the new 2.4L and V6.
    The 3.05 final drive is hinting me that the 3.5s still only get the 4T45.
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  4. #4
    suckit
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    Re: switching to 6-spd auto transmission... possib

    my guess is a manual swap would actually be easier overall... you wouldnt have TCM issues. i guess you would need to redo pedals...

  5. #5
    suckit
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    Re: switching to 6-spd auto transmission... possib

    Quote Originally Posted by CjLink
    my guess is a manual swap would actually be easier overall... you wouldnt have TCM issues. i guess you would need to redo pedals...
    and shifter assembly
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  6. #6
    suckit
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    Re: switching to 6-spd auto transmission... possib

    you'll have to change that for the auto too. i'm assuming it would be one with tapshift or a different number of gears you can put it into...

  7. #7
    suckit
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    Re: switching to 6-spd auto transmission... possib

    Quote Originally Posted by CjLink
    my guess is a manual swap would actually be easier overall... you wouldnt have TCM issues. i guess you would need to redo pedals...
    But there might be PCM issues. It's the 3.5L, not 3.9L.

    But bottomline is, for our cars, if you want a certain transmission, you're better off getting one that has it already. It's just not economically justified to do a swap.
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  8. #8
    suckit
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    Re: switching to 6-spd auto transmission... possib

    Quote Originally Posted by ToniCipriani
    Quote Originally Posted by CjLink
    my guess is a manual swap would actually be easier overall... you wouldnt have TCM issues. i guess you would need to redo pedals...
    But there might be PCM issues. It's the 3.5L, not 3.9L.

    But bottomline is, for our cars, if you want a certain transmission, you're better off getting one that has it already. It's just not economically justified to do a swap.
    Even if I had to pay for a new transmission anyway? Would the cost still be that prohibitive?
    Planned mods:
    HSRK, motor mounts, tinted tail lights, ECM/TCM/whatever tune, hood struts, HIDs, white and blue gauge cluster and CD/menu screen LED swap, GTP rear valance, GXP front bumper, GT-R exhaust
    Finished/in-progress:
    2/8/09 - removed intake resonator | 3/21/09 - installed Injen clone stage 4 CAI
    3/23/09 - 30% tint w/eyebrow
    12/2014 - 2008 stereo install (for aux in)

  9. #9
    suckit
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    Re: switching to 6-spd auto transmission... possib

    IVe read conflicting sites on this that the 3.9l can accept the 6-speed transmission. When there is conflict a lot of times you can its just people assume they know everything. Everything is possible with automobiles. Having a manual in a 240HP v6 more than a stock 302 from a foxbody GT i may add "225hp" car makes sense to me. The slapstick automatic is just a tease really. More research is needed to answer this further, but I'm sure with "pedals" a new shifter, and possibly some sort of adapter "if need be" and maybe if needing an adapter, shorter shafts when then be needed. Currently used 4-speed autos for the 3.9s are selling for $800 and up on used, new ones are near $2,000. I've found low mileage 6-speeds for as low as $500+160 freight. With that in mind there is plenty of cash to match the price of an auto to buy the additional parts. If others may help in the research we could find a parts list of what all is required to get this done. If they can put LS3 engines in fords with some mods like different k-member, and ecu, then I'm sure that its possible to put 6-speeds into an auto car. Work required? sure, but the benefit of a 6-speed would be 10 fold over that 4-speed slapsick tease machine. Which when its used burns out at 100-150k even doing plenty of fluid changes. Also, recommend turning the TC "traction control" off otherwise your gonna burn that out.

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