HaydenH

I have about 2500 miles on the new transmission.

I have a 2017 Silverado 1500. 4wd. 151000 miles on it. It has a new factory rebuilt transmission in it. They also done a motor mount at the same time. this occurred in middle of March. My issue is when I am driving and going up a slight grade around 45-55mph I get a jerk. The tach moves, and there is an audible difference in sound. At higher speeds and steeper grades there is no issues. Transmission fluid is clean. No transmission codes. Any ideas?