First Time Posting.I need help bad.I have a 2003 ch613 w/ a 355/380 hp engine that I haul logs with, 4 months ago while hauling a load of logs I lost power in upper gears. dose good thru lower gears but hit 8th and it just stops pulling and i have to go back to 7th.If climbing a hill hauling 30 tons it will fall to 30 mph.I put it in the shop, they changed charge air cooler, exaust manifold bolt's,, one was broke all new hoses and clamps,lift pump,checked all EUP's and selinoid's,checked turbo has 35 psi boost.Finally after 4 weeks they called and said they had done all they could do , charged me $5,000 and sent me on my way.Still no power so i took it to another shop where i know the mechanic but they are a volvo dealer and not authorized to work on mack so no computer access but he is good and done what he could w/ a borrowed lap top.He said he checked all the obvious things and changed ALL the sensors.Still no power so i put a new ECM on it,still no power During this time I'm not working and spending money /5 weeks. So i parked it and went and bought a peterbilt w/ a 410 caterpillar but still have the mack just sitting in the yard costing $950 a month any heip will be greatly APPRECIATED...