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Problem: Truck while in 2 wheel drive will sporadically and temporarily tug briefly to the right causing a noticeable pull in the steering wheel to the right. It is only noticed between the speeds of approximately 40-50 MPH. There may be tugs at lower speeds but it is too small to be certain. The tugs do not occur over 50 MPH. The issue cannot be reproduced by the driver. There can be one tug or two to three sequential tugs. The vehicle is problem free prior and after the tugs. The force of the tugs can be mild, moderate or heavy. The tugs are noticed daily closer to the 42 MPH and 50 MPH marks in higher gear while coasting without acceleration or deceleration. For example, truck is accelerated to the 40-50 MPH range and acceleration is softened to allow for coasting in that speed range; the transmission will typically be in a lower gear, higher rpm, for a few moments until it up-shifts to the next higher gear and lower coasting rpm; the sporadic tugs are typically noticed in the lower gear, higher rpm range (1650). It seems that maybe the tugs are more prevalent during the first 5 to 10 minutes of operation from a sitting, parked position (cold engine or hot engine is irrelevant, it appears). Weather and pavement conditions do not affect the problem. Truck tracks straight when not tugging to the right. Problem started around 24,000 to 25,000 miles. Vehicle: 2015 Chevy Silverado, 2500 HD, WT, 6.0L Gas, manual 4x4, dual cab, long bed, tow package, plow package with 26,000 miles currently. Troubleshooting done so far by dealer: (1) corrective alignment; (1) alignment check after corrective alignment; tire rotation; swapping the two tires in front right to left; suspension check; front brake removal, check and lubrication. The dealer is currently stumped. Summary: Dealer has checked for radial pull, mis-alignment, tire pressure and brake issues. The closest guess that I have is from someone else's thread of: passenger side CV shaft going bad. They had what appeared to be the same tugging issues and the CV shaft did not give the tell-tale audible noises of failure. Their passenger side CV shaft just went bad, they changed it and posted that problem was mostly likely solved. I don't know though. Any thoughts??
