Sorry I can't be of help other than to offer my$. 02. Look for quality in the job Vs. convenience in location. You'll end up with a long lasting piece of equipment Vs. many trips to a shop that doesn't offer the kind of quality needed to withstand the tourque the Cummins delivers. There's an outfit that will deliver the trans to you and you can return your old (core) but, I can't remember who it is - I think Black Mountain Diesel??? They are TDR Members and specialize in our automatics. I'm sure someone will ring in with more info than I was able to give. Remember, you get what you pay for and these trannies don't come cheap. Sorry couldn't be more helpfull and good luck to you.