My truck was diagnosed at the dealer with all of the transmission cooler lines leaking, at the crimps. Nearly everyone I know that has a 2007-2009 has had the same issue. If undiagnosed, this could lead to transmission failure due to fluid loss, loss of pressure, etc. Clearly a manufacturing defect, no diagnosis of cause due to elements or driver error, etc.
2008 Chevrolet Silverado 2500 transmission complaints
Page 2 of 2: complaints 11 to 14 of 14, newest first, as owners wrote them.
Tl* the contact owns a 2008 chevrolet silverado 2500. The contact stated that the transmission was leaking fluid and the vehicle would stall without warning. The dealer and the manufacturer were contacted, but denied any assistance with repairs to the vehicle. The vehicle was not repaired. The failure mileage was 38,000 and the current mileage was 41,000.
2008 chevy silverado 2500, gas engine, 34,600 miles. Transmission is having issues that dealer cannot seem to fix. New pump put into trannie, still having problems. Usually happens in tow haul mode, hauling approx 5,000 lbs. Transmission will not shift up, holds and revs to 3500 or 4000 rmp's. I take foot off gas and it bumps into gear. Most often happens at 35mph and 55 MPH. When slowing down transmission slams into lower gear and revs very high. At 55 MPH on I-435 in kcmo during rush hour, trucks tires locked up and squealed when trannie down shifted. Has a major issue between 30-40 MPH. Again, slams between gears throwing passengers forward (I don't want to think about how it is affecting the horses!) we are first and only owner of truck. Truck treated very well, no off-roading or abuse. Sad that we are having this issue..... It doesn't even have 35,000 miles on it!!!!!
Automatic transmission lines 2008 chevy silverado with allison transmission. Factory transmission lines leak and must be replaced. When the weather turns cold, the lines/crimps holding the rubber hose to the pipes fail and automatic transmission fluid is lost, sometimes in catastrophic manner, causing the vehicle to loose propulsion. Reports of failure are extremely common, and it is not unusual, that the lines may have been replaced 3 times within the 1st 50,000 miles. Gm has issued 'new, updated' parts, but they are no better than the original parts. The new part numbers are 20759971, 20759972, 20759973. Wile repair is covered on the 36k bumper to bumper warranty, there is no coverage on the 100k warranty. Gm should replace the lines free of charge for the 1st 100k miles with a hose that will not fail. Consumers can take the original gm line to a hydraulic shop, have the rubber portion of the lines replaced with standard hydraulic hose suitable for atf fluid and there are no further failures. If consumers can fix the lines, perhaps gm can find a solution.
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