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    Author Topic: 340 trans combo  (Read 746 times)

    Offline money pit

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    • Posts: 256
    340 trans combo
    « on: March 31, 2017 - 08:58:26 PM »
    Can I use a 904 trans with a 70-73 340 engine or should I get a 727 trans? I currently have a 73 challenger with a 318. I working on a budget. Thanks
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    Offline Bullitt-

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    • Posts: 12167
    • Better Things To Come Member Since 2/16/06
    Re: 340 trans combo
    « Reply #1 on: March 31, 2017 - 09:30:23 PM »
    The only issue I'm aware of is if the 340 is internally or externally balanced.  As i  understand all 318's are external so you may need to make changes to the torque converter if the new 340 is internally balanced.

    I'm told this is as simple as removing the welded on weights on the converter but I'd triple check that before going forward.   :2cents:
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    Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
    Screwed by Photobucket!

    Offline 7212Mopar

    • Full Member
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    • Posts: 595
    Re: 340 trans combo
    « Reply #2 on: April 01, 2017 - 01:06:04 AM »
    I have a 340 internal balanced with a 904. 340 flexplate and noon weighted converter. The 904 will be beef up to go with my 416 stroker soon. My builder told me it can take 600 hp.
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    1973 Challenger Rallye, AT with 1971 340
    2012 Challenger SRT8 392 YJ,  6 spd

    Offline cudabob496

    • Sr. Resident
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    • Posts: 8024
    Re: 340 trans combo
    « Reply #3 on: April 01, 2017 - 07:27:44 PM »
    there are some things that can be done to make the 904 more
    reliable and stronger, I suspect. On my 727, I had it rebuilt, and
    upgraded about 4 of the parts, and its been running great for 17 years.
    And it gets a regular beating.
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    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

    2011 Kawasaki Z1000
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