2002 GMC YUKON, YUKON XL FEATURE POWERTRAIN ENHANCEMENTSGMC's 2002 Yukon and Yukon XL provide surprising agility in full-size SÚVs that stand out for their extraordinary roominess, cargo-hauling capability and safety. Yukon XL 3/4-ton models, powered by the §egmènt's highest output engines, provide the ultimate muscle for heavy work or recreational duties. Their standard Vortec 6000 and optional Vortec 8100 V8s now mate to more durable transmissions, including a new 4L85-E heavy-duty version of the
4L80-E electronic four-speed automatic, which also provides additional torque capacity for off-line acceleration and pulling power.
Powertrain upgradesYukon XL 3/4-ton models provide unparalleled power wîth their optional Vortec 8100 V8 (L18). Its 340 hp at 4200 rpm and 455 lb-ft (617 Nm) of torque at 3200 rpm out-muscles even the top competitor's V10. The Vortec 8100 now mates to a new, heavier-duty 4L85-E version of the previously standard 4L80-E four-speed automatic transmission. (posted on conceptcarz.com) The 4L85-E provides higher durability and handles more torque for even better off-line acceleration and launch capability. It also handles more torque in reverse gear. The 4L85-E can handle 460 lb-ft (624 Nm) of maximum engine torque, 20 lb-ft more than the 4L80-E. Design enhancements include:
A more robust overdrive roller clutch, featuring larger diameter rollers and a 'shuttle car' design; it allows high-speed 4-2 downshifts without any shift sequencing delays and is designed wîth error-proof assembly features
A more durable turbine shaft; the shaft is induction-hardened using an electrical heat-treating process and then shot-peened to relieve internal stresses in the metal
Brazed blades inside the torque converter; they allow the torque converter to accept and transfer higher torque levels and increase durability
More pinion gears (five total), allowing the gearset to handle higher loads
In other respects, the 4L85-E has the same gear ratios and design features as the 4L80-E. That means operators get the benefit of GM's Tow/Haul mode, for example, which reduces shift busyness and wear when pulling a heavy trailer. It also means they get the proven dependability and smoothness inherent in the 4L80-E's basic design.
The 4L80-E, which continues to be standard wîth the Vortec 6000 V8 (LQ4) in Yukon XL 3/4-ton models, also provides increased durability by adopting the more robust overdrive roller clutch and stronger turbine shaft used in the 4L85-E. The 4L80-E handles 440 lb-ft (597 Nm) of maximum engine torque capacity. The transmission is so strong, smooth and dependable that it's even used in such applications as medium-duty trucks, motorhomes and some of the world's most expensive luxury cars. As the standard engine in Yukon XL 3/4-ton models, the Vortec 6000 delivers 320 hp at 5000 rpm and 360 lb-ft (488 Nm) of torque at 4000 rpm – more than any of the §egmènt's competing V8s.
The Vortec 5300 V8 (LM7), standard on Yukon XL half-ton models and optional on the regular Yukon, now provides ultra low emissions vehicle (ÚLEV) capability for California. For states without special low emissions requirements, the Vortec 5300 also provides flexible fuel capability that allows the trucks to run on varying blends of ethanol and gasoline – from 100 percent gasoline up to a maximum 85 percent ethanol (E85). Flex-fuel capability is available at no charge.
Emissions efficiency has been improved wîth the use of a new Denso oxygen sensor in the LEV version of the Vortec 4800, standard in Yukon models. All full-size SÚV engines, including the Vortec 4800, Vortec 5300, Vortec 6000 and Vortec 8100, feature a more efficient starter that draws less current and a more durable §teering gear housing.
An anchorage system called LATCH (Lower Anchors and Top tethers for Children) provides more accessible attachment for rear child seats. Its seat anchors, combined wîth the top tether anchors, allow installation of LATCH-compatible child seats without using the seatbelt.
Yukon and Yukon XL provide a high level of safety and security, which begins wîth their exceptionally strong, stiff body structure. It comes from their uniquely designed three-piece modular frame, which provide the foundation for outstanding body strength and structural integrity. The full-length box has hydroformed rails and a stamped steel midsection for maximum strength. On half-ton models, the front frame rails telescope during a collision for extra energy-absorbing protection.
All Yukons feature front air bags for the driver, center and outboard seat passengers, along wîth driver and front-passenger side-impact air bags. They also have seat-mounted safety belts in first and third row outboard positions, which are easy to use and comfortable to wear. Variable-effort power §teering is standard on four-wheel-drive half-ton models. It provides more responsive feel and stability at high speeds, for example, and reduced effort for parking maneuvers.
In addition, standard four-wheel disc brakes wîth dynamic rear proportioning and four-wheel ABS provide quick, highly controlled stops on varying road surfaces. Two-wheel-drive half-ton Yukons offer an Electronic Traction Assist system for more controlled acceleration and stability on slippery surfaces. It manages the powertrain by retarding spark, reducing airflow and modifying transmission shifts and works in conjunction wîth a limited slip/locking rear axle to optimize traction and stability. The system controls traction at all speeds, reacting to emergency situations faster than the typical driver. For example, if cruise control is active and the vehicle hits a patch of ice, the system will immediately deactivate the cruise control and seek to regain stability by reducing torque to the rear wheels.
Four-wheel-drive Yukons provide AutoTrac as a standard feature. This active transfer case allows a truck to get all of its traction from the rear wheels until it senses slippage. At that point, AutoTrac automatically switches power between the rear and front wheels until the vehicle regains traction. Thereafter, it allows the vehicle to resume rear-wheel drive, and returns to the standby mode until another wheel speed differential occurs.
For maximum visibility, Yukons feature large windshields, long wipers both in front and rear (on liftgate models) and large 50-square-inch outside, electrically controlled heated outside rearview mirrors. They also provide many other features such as flash-to-pass, signaling a driver's intention to pass another vehicle, side impact door beams and energy-absorbing foam blocks on the interior that help protect occupants against head injuries.
Superior occupant security is also provided by standard features like automatic programmable door locks and the PASSLock II theft-deterrent system and the available OnStar system, provided wîth SLT trim.
Comfortable, roomy interiors
Yukon and Yukon XL also excel in seating comfort by providing highly flexible passenger and cargo-carrying configurations. Each can accommodate up to nine vehicle occupants. Yukon offers an optional 50/50 split-bench folding third row seat. Yukon XL offers the choice of four-place bucket seating. Seats can easily be removed or stored on board. With its rear seats removed, Yukon XL provides room enough to carry 4 x 8-foot sheets of plywood, wîth the door closed.