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im planning on doing a th400 swap

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Old Jul 28, 2010 | 11:28 PM
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Question im planning on doing a th400 swap

like the title says im planning to do a th400 swap and im a litto bit confused LOL.. Im looking to get one from craigslst and have it rebuilt.. but they;re so many different years LOL.. is there any difference between one from like a 70ish to like a 88ish or somethin ?
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Old Jul 30, 2010 | 11:13 PM
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Originally Posted by xdanny510x
like the title says im planning to do a th400 swap and im a litto bit confused LOL.. Im looking to get one from craigslst and have it rebuilt.. but they;re so many different years LOL.. is there any difference between one from like a 70ish to like a 88ish or somethin ?
Not really. '71 and older had sprag type direct drums. Newer years can be upgraded with a 4L80E sprag type drum. At some point they switched from aluminum apply pistons to steel.

They also came with bellhousings to fit everything from chevys, buick/olds/pontiac, jeeps, jaguars, etc. It's not worth trying to adapt a non chevy bellhousing to an LS engine.
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Old Jul 30, 2010 | 11:34 PM
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buy a built th400 not a used stocker
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Old Jul 31, 2010 | 12:13 AM
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Originally Posted by smok'nZ
buy a built th400 not a used stocker
im gonna buy a used one and have that one built thats why im asking
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Old Aug 3, 2010 | 10:04 PM
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are you going with a ultra bell
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Old Aug 4, 2010 | 06:59 AM
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Let the shop thats going to build it supply the core.
Not sure what the going rate in CA is, but a used core sells for 75.00 in the detroit area.
Regardless what core you but its most likely going to need internal hard parts.
If I had a choice between buying late or early I guess I would buy a later core.
Look for heat treated splines on the pump stator.
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