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Thread: Confused

  1. #1
    Registered Member Tabasco's Avatar
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    Confused

    Either I am confused or Eckler's is. I need a transmission mount cross member for a '56 convertible.
    Eckler's has two listed. They say one is for Turbo Hydra-Matic 200, 400 but I thought these were different lengths. The other is for TH700R4, TH350 Or 4L60E but I thought these were different lengths.

    I thought the 350 and 200 were the same length. And I thought the the 400 and the 700R4 were the same length. So I don't know if I am confused. Can someone straighten me out. I plan to install a 700R4.

  2. #2
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    First I am aware of two lengths of Th350 and two of TH400, Neither 400 is same as 700. There are also 3 and 4 speed 200s..

  3. #3
    Moderator NickP's Avatar
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    Good complete handy chart Nick. The only thing I note is that the chart shows a short tailhousing 350 at 27-5/8", a long Powerglide at 28-5/16", and a 200-4R at 28-1/4". I think the short 350 is very close to the PG and 200-4R. All 3 are close enough to use the same driveshaft. Which I have done on the same car that had all 3 at one time. Far as I know the trans mount distances are good. I suspect that the 21-5/8" dimension for the 350 should be 22-5/8" or even 22-5/16".
    Last edited by Rick_L; 08-23-2018 at 05:12 PM.

  5. #5
    Registered Member Tabasco's Avatar
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    Thanks for the chart Nick . Now I don't have to be confused anymore. I didn't know they made so many lengths of transmissions.

  6. #6
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    Nice chart I have never seen that before. Confirms my suspicions.

  7. #7
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    Great chart, I made a copy.

  8. #8
    Registered Member chevynut's Avatar
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    Why would the transmission length affect the crossmember? Seems to me it would just mount further back on the frame.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension

    You can see my 56 Nomad build here http://www.picturetrail.com/chevynut

    For affordable C4 Corvette Suspension conversions for your car, visit http://www.classicedgedesigns.com

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  9. #9
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    Quote Originally Posted by chevynut View Post
    Why would the transmission length affect the crossmember? Seems to me it would just mount further back on the frame.
    Convertible with X frame.

  10. #10
    Registered Member Tabasco's Avatar
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    After studying the situation I realized that the transmission length wasn't the deciding factor for which cross member I needed. It is the distance from the front of the transmission to the trans mount. So the one for the 700R4 and the TH350 would be the cross member I need. Thanks to everyone for the help.

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