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    Kenny Lentz
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    GMC 2500HD Denali

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  1. 10 speed wasn’t designed by GM and Allison. Joint effort with Ford, GM and Zed F. Zed F gearbox. Ford designed theirs for their trucks an GM designed theirs. Allison did do testing on them, but it already was a done deal.
  2. The 10 speed is not an Allison. Zed F gear box the same that’s in Fords. Allison doesn’t have a 10 speed.
  3. Used on of these on my 2020. Works great. Only issue is if you use a locking pin, it won’t fit. Need to be a straight pin and clip.
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