2014 vs 2015 Automatic Transmission
Team Owner
Joined: Sep 2000
Posts: 25,025
Likes: 2,716
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Not a thing wrong with a 2014. It has the A6 vs the A8 in the 15 and up and had been less of a problem. 6 speed vs 8 speed. The shudder that has been the problem is the Torque Converter and not the trans. GM likes to do the quadruple flush to "fix" the shudder when it is only a bandaid when the actual fix is in the Valve Body signal circuits. If the shudder has been happening too long the Converter will have to be replaced with a FACTORY GM Reman Converter not an aftermarket converter.
Before the bandaid was developed, lots of A8s were getting new torque converters and other "repairs" that didn't really fix the problem.
If the TC was sufficiently damaged by using the original fluid, a few of those had to be replaced and went bad again if still using the old formula fluid.
OTOH, we also owned two C6's with the A6 and it was just fine. Someone at GM (Tadge?) also said that the only advantage of the A8 was fuel economy, 0-60 and 1/4 mile times were not effected. In autocrossing or road track time, the A8 may have a slight advantage because it gives more gear options for a corner but that's really getting picky.
Last edited by Gearhead Jim; Mar 11, 2025 at 10:49 AM.
