Transmission cooler line leak (Allison transmission)
POWER TRAIN
3 NHTSA complaints · 2010-11 → 2014-01
“PROBLEM WITH TRANSMISSION COOLER LINES FOR THE ALLISON TRANSMISSION. 123,000KM'S ON MY 3500 AND THE TRANSMISSION LINES HAVE BEEN REPLACED 3 TIMES”
“TL*THE CONTACT OWNS A 2007 CHEVROLET SILVERADO 3500. WHILE THE VEHICLE WAS PARKED, THE CONTACT NOTICED THAT THE TRANS COOLER LINES WERE LEAKING TRANSMISSION FLUID”