One problem related to transmission fluid leaking has been reported for the 2003 Chevrolet Silverado 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Chevrolet Silverado 2500 based on all problems reported for the 2003 Silverado 2500.
Began hearing low moaning sound while driving down hwy. Pulled over immediately to determine cause. Found trans fluid leaking from allison trans. Trans. Shop found cracked extension housing and old metal fragments in trans pan. Old metal fragments were caked inside pan indicating a long existing problem and not the result of current cracked housing. Trans shop informed me this was a common defect in the chevy allision trans, but was rare in vehicles with such low milage (69000) and well maintained like my truck. Informed gm of problem. Gm denied any problems with the allisons and are refusing to assist in resolving issue. Contacted allison directly and was informed the tranny was origionally designed by them but is manufactured by gm and that gm had made modifications to their design. This truck also experienced $7000 worth of fuel injector issues at 50000 miles.