163 0412 Duramaxpart103 Z
Duramax Diesel Hot Rod: Part One
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The Allison is much larger than the original TH700R4, but it fits the C/K chassis surprisingly well, requiring only minor adjustments (no cutting) to the transmission tunnel. As a point of reference, the Chevy/GMC TH400 and 4L80-E bell housing and flexplate bolt patterns are the same as those used by the Allison. View Related Article
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