Personally, if I was that close to Merchant Automotive (Eric Merchant), I would take it there for him to work on. He is in Michigan and from what I hear is worth every penny when he does a tranny upgrade. I was reading on another forum where he removed an allison, upgraded it and reinstalled in about 4 hours. Go to gmdieseltech.com and his number is on his site. This is definately something you would have to call in advance for.