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 turb