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Old 01-29-2011, 02:15 PM
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Default Trans Swap

Quote:
Originally Posted by Shadowjack View Post
There are only two crossmembers for '64-'72 Pontiac A-bodies: ones for standard unboxed frames and ones for heavy-duty boxed frames. Transmission irrelevant.
I ran across this old post while doing a search.
I'm in the process of rebuilding My '68 LeMans Convertible.
The Car came with a 300 2 speed, and I going to put in a TH 400 short tail.
Looks like our sponsor only sells 3 cross members.

64-72 hardtop
64-67 convert
68-72 convert

So I should be alright with the same cross member. Part # 9796242 just move it to the right set of holes in the frame.
I'll post this in the 68 69 forum also.
Thanks in advance.

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Old 01-29-2011, 02:21 PM
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The same crossmember works for all transmissions. Installation of the TH400 requires that it be moved back 6" from the position originally used for the ST300.

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Old 01-29-2011, 02:56 PM
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Thank You b-man
Trying to keep the cost of this project down as much as I can.

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Old 02-02-2011, 05:33 PM
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You will need a different flywheel too. At least I did when I swapped the same tranny's. Different driveshaft also.

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Old 02-03-2011, 03:42 PM
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Quote:
Originally Posted by shineybike View Post
You will need a different flywheel too. At least I did when I swapped the same tranny's. Different driveshaft also.
Thank you Shiney. I have a SFI flywheel for the project,but I bet it's something that would be overlooked.
I also have a few drive shafts here . Do you remember the measurement.
Thanks again......

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Old 02-03-2011, 04:19 PM
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That was good planning on the flywheel. When I did mine I did not know I needed a different one and had to have it overnighted from the parts place $$$$. I don't remember the length of the drive shaft, but I looked in my 1968 service manual page 4C-1 and it lists it as 55.34 inches for a 2-door tempest with a turbo-hydramatic trans. It doesn't say whether that's a 350 or 400 TH.

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Old 02-03-2011, 11:55 PM
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Default trans swap

can you let me know what you come up with to make it work. I'll be doing same swap in the near future

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Old 02-04-2011, 07:06 PM
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Thanks again shiney. Thats what I came up with after a search.
I think I'm going to wait until after the trans is in and just measure the drive shaft.
Thanks again .

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