It's the AAM 11.5, same internals as what is used on the newer Dodges, but ht ecover is slightly different. Check out the PML covers, much less expensive and get you the same degree of fluid cooling and features too. Plus they make a Duramax vs Dodge specific part that fits perfectly! Call us if you have any questions on them.
DOH! It is an 11.5 - thanks for catching that, Mark. I think I ordered mine direct from Mag-Hytec, just shy of $300. I would contact them or the vendor you choose, but I assume you would need the GM 14-11.5
Mine fit like a glove and took 7 qts. of synthetic lube to fill to the middle of the dipstick. Hardest part of the install was scraping the gasket paper and sealant off the punkin after pulling the OEM cover.
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