2020 GMC Sierra AT4 Off-Road Performance Package | Capability Test
The Sierra AT4 Off-Road Performance Package includes: -6.2L V-8 engine mated to 10-speed automatic transmission. -18-inch machined aluminum wheels …
2020 GMC Sierra AT4 Off-Road Performance Package | Capability Test
The Sierra AT4 Off-Road Performance Package includes: -6.2L V-8 engine mated to 10-speed automatic transmission. -18-inch machined aluminum wheels …