Posted by andy r on July 25, 2022 at 20:43:02 from (208.126.193.44):
I have a 2015 Chevrolet Silverado 1/2 ton 4 door with the 5.3 gas engine. 150,000 miles. I am noticing some unusual transmission noises and shifting. The first thing I notice is some of the shifts are more abrupt than they ever have been - probably those under 45 mph. Most of the time the shifts have been smooth and not even noticeable. Now some of the shifts up and down have a slight clunk noise or a noise like a slap. Secondly going down the road at 55 I wonder if the transmission is shifting or the torque convertor is unlocking. Sort of feels and sounds like you hit a crack in the road with both front tires, but this road is newly asphalted and smooth. Thirdly, when I back out of the driveway, stop, turn the wheels to the left slightly, and put it in drive 20 - 30% of the time it will sort of stop/go/stop/go for a few feet. The transmission is running about 194 degrees pulling the camper. Transmission has never been abused. It has pulled the camper (5000 pounds) about 5000 miles the last two years. U-joints are OK. Transmission fluid is fairly clear, not perfect, but fairly clean. Am I starting to get some sticky valves? Would a fluid flush be beneficial? Would a plugged filter cause my problems? Fluid and filter have never been changed. Still pulls the camper without slip. Thanks.
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