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We purchased a 2007 379, with a 550 CAT we drove it home and was fine the next day noticed it was Idiling rough. Long story short after 4 loads we have had a complete over haul on it due to a cracked head. After new head, cam shaft, crank shaft, all new rocker arms, one injector, liners...

99 Pete 379, 60 series Detroit, 840000 on miles. Just had full rebuild with new crankshaft (spun a bearing) When we took to the shop jakes were working perfectly, now half the time they are not working more specifically while on the HWY. Mechanics says maybe computer?? But we took it to the shop...