I have a Autogear M21Y that was in the crate when i bought my old Chevelle back. Previous owner bought it around 06-07 and never installed it. I contacted Autogear when I installed it and done everything they told me. It's not to bad with the 4:10, has the OD 4th gear. He said there was not a big market for these OD trans so they only built around 200 or so.
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