When we first rolled our 2002 Chevy Silverado 2500HD into the bay at PPE Diesel's shop in Montclair, California, we thought for sure the transmission was toast. Interestingly, upon inspection it was actually in relatively good shape despite likely having more than 200,000 miles on a truck that was pushed hard enough to melt a piston and head. This just further reinforced the notion that with regular fluid and filter changes the Allison 1000 transmission should outlast the truck.

Still, we were planning to push a fair bit of power through it while punishing everything with big tires. So, the build moved forward. At first, we figured that a Stage 4 or Stage 5 build from PPE would be enough for our needs. PPE claims that the Stage 4 kit is good for holding about 850 hp, and the Stage 5 about 1,200 hp (measured at the crank, so roughly 650 and 800 hp at the wheel, respectively). Although either would have done the trick, the team at PPE sold us on the company's top of the line Stage 6, which can hold about 1,500 hp (about 1,000 to 1,200 at the wheel). Aside from regular fluid changes, we should never have to worry about the transmission again.


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