GMC Sierra 2500 HD rear end failure and transmission issues after recent replacement, possible fluid problem on GMC Sierra 2500 HD

Some GMC Sierra 2500 HD owners report experiencing transmission issues, such as hesitation during shifts, which may include harsh shifting and engine bogging, particularly after a recent transmission replacement. These problems can arise if the replacement was not performed correctly. Additionally, some owners note that fluid-related issues can contribute to transmission problems, emphasizing the importance of maintaining proper fluid levels and quality for optimal function, with fluid replacements costing between $150 to $300. While rear end failures are not commonly reported, some owners have raised concerns about unusual noises, like humming, from the rear end, which should be inspected by a professional to prevent further damage. Regular maintenance, including fluid checks and prompt attention to any issues, is crucial for ensuring the reliability of the GMC Sierra 2500 HD.