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Thread: LS1 T56 vs. LT1 T56 similarities/differences

  1. #11
    Registered Member chevynut's Avatar
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    I have a current customer that's using a 4L70E tranny, and it supposed to be the same case as a 4L60E. The TCI website shows the mounting point at 21 3/4" from the bellhousing face for all 4L60Es, but he measured his tranny at 24 5/16".

    Too bad you can't get reliable info from these transmission suppliers. That's why I have every one of my frame customers measure their transmissions or give me the dimension they want to use for the crossmember position.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


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    56 Chevy 2-door BelAir sedan
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    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  2. #12
    Registered Member WagonCrazy's Avatar
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    Rick,
    I have an LS1-T56 combo out of a 2002 Camaro in my nomad. And it's in one of Laszlo's C4 conversion frames. I have the stock bell housing, and the shifter set in the rear most position.

    The trans looks like this one...

    t56.jpg

    What dimension on T56 are you looking for?
    1957 Nomad- LS1/T56 on C4 chassis
    1959 Fleetside Apache 1/2 ton, shortbed, big window, 327ci.

  3. #13
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    I did some more searching last night and found the chart that's on 5speedtransmissions.com is actually a chart from Tremec! And like you Cnut I looked at the automatics and found the same info you did, and we know it's wrong too.

    Wagon Crazy, I need the overall length with bellhousing, the length from the bellhousing front to the shifter, and the length from the bellhousing front to the trans mount.

  4. #14
    Registered Member chevynut's Avatar
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    Seems like you should be able to trust the dimensions from Tremec, the manufacturer of the transmission. I've noticed they've taken the Viper T56 off the list I linked.

    Here's the specs directly from Tremec: http://www.rsgear.com/TCase/TREMEC/T56.pdf


    For the LS Camaro version they show the shifter at 29.39", the mount at 26.56", and overall length at 31.88". All measurements from the front of the bellhousing, which is 5.51" deep.

    For the LT1 Camaro version they show the shifter at 28.26", the mount at 25.93", and overall length at 31.26". All measurements from the front of the bellhousing, which is 4.88" deep.
    Last edited by chevynut; 04-09-2016 at 07:41 AM.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  5. #15
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    They didn't get the LT1 right, why should I trust their LS dimensions without confirmation?

    Obviously having this come out the way I'd like, keeping my driveshaft, shifter hole, and crossmember location isn't the end of the world if it doesn't - but it sure would make things easier.

  6. #16
    Registered Member chevynut's Avatar
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    Why are you upgrading to another nearly "obsolete" engine platform anyhow? Why not go with the NEW LT1 at 650HP?

    Are you saying your measurements are different than Tremecs?
    Last edited by chevynut; 04-09-2016 at 09:21 AM.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  7. #17
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    Funny you should mention that Cnut, a couple weeks ago I was ready to suggest the same for you,

    http://www.chevrolet.com/performance...76-b15.htmlnny

  8. #18
    Registered Member NickP's Avatar
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    page not found error 404

  9. #19
    Registered Member chevynut's Avatar
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    Quote Originally Posted by markm View Post
    Funny you should mention that Cnut, a couple weeks ago I was ready to suggest the same for you,

    http://www.chevrolet.com/performance...76-b15.htmlnny
    Except I'm not looking for a new engine.

    Show me one NA LS engine that gets 567 ft-lb and over 500 ft-lb from 2000 to 5000 RPM. I've never seen one, at least not a streetable one. I always wanted a big block Chevy and I believe I have one of the the best ones out there.

    If I wanted to go supercharged, I'd put one on an LS7. I may do that in my other 56....in my next life.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  10. #20
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