GMC is giving its Sierra AT4 truck more performance with a new Off-Road Performance package option. The Off-Road Performance Package AT4 includes a 6.2L V8 engine and 10-speed automatic transmission.
The truck comes with 18-inch machined wheels with Goodyear Wrangler DuraTrac tires. GMC equips the performance package with a cat-back performance exhaust system and a performance air intake. The additions to the standard AT4 give the Off-Road Performance Package buyer up to 435hp and 469 lb-ft of torque.
Those are gains of 15hp and 9 lb-ft of torque over the standard truck. The Sierra AT4 was introduced this year and already has lots of stuff to make it better off-road including a 2-inch suspension lift, special shocks, and 4×4 system. The Sierra AT4 Off-Road Performance Package has an MSRP of $4,940 on top of the normal truck price.
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