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I violated my transmission last week.
The 350 is dead and I am now installing a 400.

Where can I get a th400 cross member or can I modify the one I have?
 

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I violated my transmission last week.
The 350 is dead and I am now installing a 400.

Where can I get a th400 cross member or can I modify the one I have?
New ones are about $120 or less. Do a search of ebay or google
 

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i used my th350 crossover when i changed to a th400, had to move the member back to the last hole then made a short plate to reach the trans. the only mod i had to do is when i installed a deeper pan , i had to notch the lip out of the crossmember, but not that bad if your willing. also you will only use 2 bolts instead of 4 on the frame rails. hope this helps.
 

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I violated my transmission last week.
The 350 is dead and I am now installing a 400.

Where can I get a th400 cross member or can I modify the one I have?
Reading your post made me laugh. What do you think come loose in the 350? I'm currently running a turbo 350 that originally came out of a 70 el camino. The only thing thats been done is I put a shift kit in it. Running a holeshot 3000 converter with a big cooler on it. Still running the factory installed clutches and bands. I also have a turbo 400 sitting under my work bench to swap out when the 350 goes boom.
 

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I see where your running a big block. I'm also running one. How long did the 350 last behind it?
 
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