GMC 4X4

2001 model year GMC Sierra and Chevy Silverado heavy-duty (2500HD, 3500, 3600) pickups get the option of new Duramax Diesel engines and Allison 5-speed automatic gearboxes. The Duramax Diesel 6600 is a new 90° V8, with common-rail direct injection by Bosch and 4-valves per cylinder (NB. OHV not OHC). A 7.8 litre Duramax 7800 was introduced by GM in 2000.

2000: The power output of the Vortec 4.8L and 5.3L engines increased and the extended cab gains the option of a fourth rear access door in addition to the standard third access door.

1999 GMC Sierra Z71
- Mike Strain Chanute KS [12/2000]

1999: new GMC Sierra / Chevrolet Silverado replaces the GMC / Chevrolet CK pickup trucks. The engines have been tinkered with - higher rpm for max torque and hp.
- Mike Read.

GMC Sierra / Chevrolet Silverado 4x4 1999

• utes
• 1500 Reg Cab 4x4: Vortec 4300, 5m std
• 1500 Ext Cab 4x4: Vortec 4800, 5m std
• 2500 Reg Cab 4x4: Vortec 6000, 5m std
• suspension: indep' front / rear live axles & leaf springs
• brakes: disc/disc, ABS
• 4WD:
  • Insta-Trac: push-button operation (base and LS)
  • Auto Trac: automatic transfer of torque to front wheels (LT models)
• Vortec 4300:
  • 4300cc, petrol, V6, efi, 2-valves/cyl
  • bore: 101.6mm, stroke: 88.4mm, c.r.: 9.2:1
  • power: 150kW at 4800rpm, max torque at 2800rpm
• Vortec 4800:
  • 4807cc, petrol, V8, efi, 2-valves/cyl
  • bore: 96.0mm, stroke: 83.0mm, c.r.: 9.5:1
  • power: 190kW at 5200rpm, max torque at 4000rpm
• Vortec 5300:
  • 5328cc, petrol, V8, efi, 2-valves/cyl
  • bore: 96.0mm, stroke: 92.0mm, c.r.: 9.5:1
  • power: 200kW at 5000rpm, max torque at 4000rpm
• Vortec 6000:
  • 5987cc, petrol, V8, efi, 2-valves/cyl
  • bore: 101.6mm, stroke: 92.0mm, c.r.: 9.4:1
  • power: 250kW at 4800rpm, max torque at 4000rpm
• diesel:
  • 6.4 litre, V8, turbo-charged, 160kW at 3400rpm, max torque at 1800rpm
• Rivals: Dodge Ram

URL:/4WD.html

See the CK series to 1998, Chev, GM and Suburban pages