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Tabasco
08-23-2018, 03:59 PM
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.
markm
08-23-2018, 04:39 PM
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..
NickP
08-23-2018, 04:48 PM
https://i.pinimg.com/originals/bb/7d/18/bb7d1885f430ae0619bed45f631376a5.jpg
Rick_L
08-23-2018, 05:07 PM
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".
Tabasco
08-24-2018, 05:30 AM
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.
markm
08-24-2018, 06:26 AM
Nice chart I have never seen that before. Confirms my suspicions.
55 Tony
08-29-2018, 05:45 AM
Great chart, I made a copy.
chevynut
08-29-2018, 08:12 AM
Why would the transmission length affect the crossmember? Seems to me it would just mount further back on the frame.
markm
08-29-2018, 08:42 AM
Why would the transmission length affect the crossmember? Seems to me it would just mount further back on the frame.

Convertible with X frame.
Tabasco
08-30-2018, 05:20 AM
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.