Chevy Silverado 2500HD Review: Avoid This Truck's Transmission Problems

2024 Chevy Silverado 2500HD Overview

• 🚚 The 2024 Chevy Silverado 2500HD features a 6.6L engine with an Allison-branded transmission, though it's a GM-Allison collaboration, not purely Allison-made.
• 💡 The 10-speed automatic transmission is a point of contention, with concerns about its efficiency and performance, especially when towing.

Transmission Performance and Efficiency Concerns

• ⛽ The 10-speed transmission, despite its complexity, achieves only 13-15 MPG on the highway, worse than older 6-speed transmissions in some cases.
• ⚠️ When towing, fuel economy drops to 8-9 MPG, labeling it a "gas hog."
• ⚙️ Owners have reported "wobbly shifting" when towing, and dealer reprogramming has not always resolved the issue.

Engine and Build Quality

• 💪 The 6.6L engine is considered excellent and powerful, generally lasting a long time, despite its high fuel consumption.
• 🛠️ The truck features a basic model with fabric seats, purchased for $55,000, which is seen as a good deal for a 4x4.
• 🔩 The exterior is primarily painted metal, with actual metal bumpers and a metal tailgate, though the tailgate is thinner than the front.

Comparison to Other GM Trucks

• 🚫 The four-cylinder turbo Silverado is strongly advised against due to potential engine blowouts at low mileage (around 45,000 miles).
• 👎 The 8-speed automatic transmission in the four-cylinder models is considered worse than the 10-speed, having had recall issues with its valve body.

Diagnostic and User Experience

• 💻 A diagnostic scan on a 15,000-mile truck revealed no critical transmission codes, but numerous radio and parking assist faults, likely due to a drained battery.
• 🚦 The 10-speed transmission's complexity leads to confusion between power and fuel economy, resulting in hesitant shifting and a lack of driver feel.
• ⚠️ The author advises a thorough 20-30 minute road test, including various driving conditions, to assess the transmission's performance before purchasing, especially for used models.

Conclusion and Recommendations

• 🔑 While the engine is good, the transmission is the weak point, leading the author to personally avoid this vehicle.
• 💰 Buying a stripped-down version and adding aftermarket parts later is recommended as a smarter financial approach.
• 🚗 For those considering a used model, checking the engine and radiator temperature when cold is crucial; a warm engine might indicate an attempt to mask transmission issues.