General Motors GM Genuine Parts 20835127 Automatic Transmission Fluid Auxiliary Cooler Inlet Line

GM Duramax trucks have a history of leaking trans cooler lines, this is the 3rd part number revision for these trans cooler lines I hope GM has it figured out. Line was correct for my truck, they fit exactly like the originals, but installation for replacing these is a big job. Bumper, grill, skid plates, cross member, wheel well liner, air filter and intake system all have to be removed. I used heavy duty tie wraps to try and keep these from moving after installation. Part numbers needed for a 2007 Silverado HD Duramax Extended cab were 20835125, 20835127, and 20835123. I like to use OEM parts for repairs, a lot of people recommend after market kits for fixing these cooler lines, take a look before you buy and decide.

Perfect fit for my truck.

No more leak! Absolute pain to install but definitely worth it.

Amazon description stated this would not fit a 2006 GMC Sierra 2500HD LBZ Duramax. That is not correct and does fit. Product is a perfect match for the OEM transmission line.

... This was a lot of work, remove all kinds of stuff took me 6-7 hours to get it done. A lot of twisting and cussing. If they ever fail again I will go with Red's Auto Rehab long hydraulic lines, or some other brand ( Engineered Diesel) that you cut the lines and put on compression fittings and hydraulic hose on to the stock oem hard lines, that came with the truck. . I wanted to keep truck bone stock, but forget it. Truck is a 2006 2500HD LBZ with 25,000 miles on it. One of the lines (under the skid plate) started leaking thought it was a loose connection. not so. Rubber connection to hard line is the problem. The long line has a 90 degree bend and installing it was not easy. The little clips are a pain also. Transmission Line problem is on all of these trucks. I don't trust anyone to work on my truck. However, This job took more time and was harder than I thought. Good luck and take your time! Be safe!