![]() In 1999, we compared a properly equipped 6.5L Turbo Diesel to both a stock 1999 Dodge ISB Cummins and Ford Super Duty Powerstroke during our first annual Pull-Off, which included a 10,000-lb trailer and a 6% grade. That being, if you added the right equipment, the 6.5TD could provide competitive levels of performance. 5TD Power Project came from this same thought process. They immediately said that with modifications, their trucks could equal a ' stock' Duramax 6600 powered GM pickup truck. The Duramax 6600's arrival in the fall of 2000, with its class-leading power and torque, created quite a buzz among Ford and Dodge owners. ![]() In essence, the 6.5L Detroit diesel was a leap above the 6.2L, but it's generally accepted that the engine was outpaced by Ford's Power Stroke and Dodge's Cummins turbodiesel offerings. Overheating is also an issue with the 6.5L, and it can lead to cylinder head cracking. Common problems with the 6.5 diesel include crankshaft, glow plug, and PMD failure. For Silverado and Sierra pickups, the engine was backed by either a 4L80E 4 speed automatic transmission (with overdrive) or the popular NV4500 5 speed manual transmission. The most powerful version of the engine used in GMC/Chevrolet trucks was a 215 hp, 440 lb-ft, turbocharged model. Many variations of GM's 6.5L diesel were produced, including a special 120 horsepower (260 lb-ft) model specifically for delivery trucks.
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