Two problems related to transmission failure have 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.
2003 chevy 2500hd duramax/ allison transmission has 94,300 miles on it. Found defect while backing it out of driveway; the back cover of the transmission was cracked and fluid coming out. The cover is part no. 29544804 through gm. At a cost of $666. 60 plus other parts need for repairs and labor also needed to be added to charges. The new part is just that, new from old defective part. I just did the repair my self because just lost my job the day of the transmission failed and couldn't pay to have it done. Gm tells me it is an old truck why it failed and they have no liability; yet the new cover is much heavier in design from original one.
I had the transmission fluid flushed and filter changed and the mechanic tells me there was a lot of metal particles in the transmission fluid and felt there was an impending failure. The chevy dealer told me to wait to see what occurs since he had not heard of an allison transmission failing at 50,000 miles which is where the mileage was at when I had the above service done. It seems to drive fine but I am very concerned. I have a duramax engine with the allison transmission bought in 2003 of a 2003 chevy silverado diesel 2500hd. Little towing done with the vehicle so that is not the cause.