Some years ago I replaced a TH400 with a 4L80-E in a GMT-400 (1990s body style) truck. I needed the t-case adapter for the 4L80, but the existing t-case fit perfectly - they share the same input/output shaft size.
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Some years ago I replaced a TH400 with a 4L80-E in a GMT-400 (1990s body style) truck. I needed the t-case adapter for the 4L80, but the existing t-case fit perfectly - they share the same input/output shaft size.
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