It sat since then and decided I had better take the time to start it up. Started up without to much of a problem but after moving it a small distance on the property I noticed a leak at the front of the truck. My son who had some familiarity with this truck said that it had a transmission coolant leak. It has the 6.5 duramax diesel and I have no idea what steps to take for a DIY job. Hope I am able to get some input here, thank you.