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Old 04-22-2010, 09:37 PM   #1
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Join Date: May 2009
Location: Petal Ms.
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Car: 1990 Iroc
Engine: 383
Transmission: th400
Axle/Gears: 373 zexel torsen

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interchangeable parts between a th400 & 4l80e

I am trying to beef up a th400. I have a 4l80e thats to expensive to make work in my car. Does anyone know what parts will interchange between the th400 and the 4l80e? I talked to Dana but lost my notes about what he said to do. Thanks.
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Old 04-22-2010, 10:16 PM   #2
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Location: 51N 114W, 3500'
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Car: 87 IROC L98
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Re: interchangeable parts between a th400 & 4l80e

I don't know the exact list but I do know about 80% is interchangeable. They both share the same first 3 gear ratios so the planetaries are probably all the same. I don't know how the 4L80E engages the OD but I do know with a bunch of conversions that it's possible to make it a 6 speed by splitting the gears with the OD. Good for towing because it will keep the engine in the powerband easier. Instead of 1, 2, 3, 4(OD) you get 1, 1OD, 2, 2OD, 3, 3OD, 4(OD). Not really a 6 speed tranny because it uses the weak OD gear to get the extra gears.

Nothing about the valve body is interchangeable. Only the gears etc are the same. I'm pretty sure you can use the heavier duty clutch hub with 34 element sprag for the TH400 in the 4L80E.

Trying to use parts from the 4L80E to make a TH400 stronger is stepping backwards. The TH400 is actually stronger when using a few better aftermarket parts such as the 34 element sprag and clutch hub etc.
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Old 04-23-2010, 05:40 PM   #3
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Join Date: May 2009
Location: Petal Ms.
Posts: 402
Car: 1990 Iroc
Engine: 383
Transmission: th400
Axle/Gears: 373 zexel torsen

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Re: interchangeable parts between a th400 & 4l80e

Thanks AlkyIROC, The 34 element sprag is one of the things that I think I was told to use. Also clutches but I dont know which ones. This is first time for me to be inside a transmission. I have the atsg book so there is only one way to learn right?
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Old 04-23-2010, 05:40 PM
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