OPERATING INSTRUCTION FOR 2003 AND NEWER IFS 4x4 SYSTEM
The Quigley GMC / Chevrolet 4x4 vehicles utilize a front locking differential Independent Front Suspension (IFS). This 4x4 system is devoid of either manual lock-out hubs or automatic locking hubs. Instead the differential electronically engages the front axle halves into the 4 wheel drive application when the vehicle’s transfer case is shifted. For detailed operating instructions we recommend you download and print the following pdf file. If at anytime you do not understand any of the operating instructions please contact Quigley Motor Co., Inc. Our phone numbers are listed at the bottom of the instructions or email us here.
CAUTION: When transfer case is in “N” (neutral position), the transmission “PARK” feature is disabled. Parking brake must be applied or vehicle may move unexpectedly causing serious injury or death.
The Quigley IFS 4x4 system can be shifted from 2-WHEEL HIGH (2H) to 4-WHEEL HIGH (4H) or from 4H to 2H while the vehicle is in motion up to speeds of 55 mph. However you may not shift into 4H while ACCELERATING. In extremely cold weather, it may be necessary to stop or slow the vehicle to shift into 4H.
To shift into or out of 4-WHEEL LOW (4L) slow vehicle to a crawl (1 – 3 mph) and shift the transfer case lever in one continuous motion to 4L. DO NOT PAUSE in the NEUTRAL (N) position as you shift the transfer case or your gears could clash. If clashing of gears occur then turn off the engine and proceed to shift into 4L.
OPERATING INSTRUCTIONS FOR 2002 IFS (FIRST GENERATION):
Our first generation Quigley 4x4 IFS system used manual lockout hubs. For detailed operating instructions of the 2002 Quigley 4x4 IFS system please download and print the following pdf file. If at anytime you do not understand any of the operating instructions please contact Quigley Motor Co., Inc. Our phone numbers are listed at the bottom of the instructions or email us here.
CAUTION: When transfer case is in “N” (neutral position), the transmission “PARK” feature is disabled. Parking brake must be applied or vehicle may move unexpectedly causing serious injury or death.
To prepare your vehicle for 4x4 operation you must first lock your manual hubs. Simply turning your front wheel hub selector knobs clockwise to their “LOCK” position does this. Slight movement of the vehicle in either direction will complete the lock. Both hub lock selector knobs must be set in the same function to avoid excessive front differential wear and undesirable vehicle handling characteristics.
ENGAGING 2002 IFS 4x4 SYSTEM WHILE VEHICLE IS IN MOTION
4WD High Range: Shift the transfer case to 4H only when conditions require traction. Vehicle’s transfer case can be shifted between 2H and 4H while in motion at speeds up to 55 mph, provided both of your manual hub locks are in their “LOCK” position.
CAUTION 4WD Low Range: For both shifting into and out of 4L the vehicle must be stopped and the TRANSMISSION must be in N (Neutral) whether you have manual hubs or automatic hubs. Never shift into or out of 4L while vehicle is in motion. Please download and review detailed operating instructions before engaging 4WD Low range.
OPERATING INSTRUCTIONS FOR QUIGLEY SOLID AXLE 4X4 GM SYSTEM:
Quigley Motor Co, Inc. offered solid axle 4x4 systems on our GM lineup up to 2007. This 4x4 system utilized manual lock-out hubs. For detailed operating instructions we recommend you download and print the following pdf file. If at anytime you do not understand any of the operating instructions please contact Quigley Motor Co., Inc. Our phone numbers are listed at the bottom of the instructions or email us here.
CAUTION: When transfer case is in “N” (neutral position), the transmission “PARK” feature is disabled. Parking brake must be applied or vehicle may move unexpectedly causing serious injury or death.
To prepare your vehicle for 4x4 operation you must first lock your manual hubs. Simply turning your front wheel hub selector knobs clockwise to their “LOCK” position does this. Slight movement of the vehicle in either direction will complete the lock. Both hub lock selector knobs must be set in the same function to avoid excessive front differential wear and undesirable vehicle handling characteristics.
ENGAGING 2002 and Earlier Solid Axle 4x4 SYSTEM WHILE VEHICLE IS IN MOTION
4WD High Range: Shift the transfer case to 4H only when conditions require traction. Vehicle’s transfer case can be shifted between 2H and 4H while in motion at speeds up to 55 mph, provided both of your manual hub locks are in their “LOCK” position.
CAUTION 4WD Low Range: For both shifting into and out of 4L the vehicle must be stopped and the TRANSMISSION must be in N (Neutral) whether you have manual hubs or automatic hubs. Never shift into or out of 4L while vehicle is in motion. Please download and review detailed operating instructions before engaging 4WD Low range.
No matter what type of GM Quigley 4x4 system you have, when the need for a 4-wheel drive is no longer anticipated shift transfre case back into the 2H position. If vehicle is equipped with manual hub locks return them to their "FREE" position, by turning them counterclockwise, at a convient time and location. For best fuel economy, less tire wear and quietest operation, the manual hub locks should be in their “FREE” position if so equipped and vehicle should be returned to 2H.