Here at Quigley Motor Co., Inc. we have four separate 4x4 system for our GMC / Chevrolet vehicles. The current style is our “Locking Differential” Independent Front Suspension, or IFS, 4x4 system. This system incorporates GM’s locking differential instead of lock-out hubs to engage the 4x4 system. Our current IFS or 2nd generation system dates from 2003 to the present. For information on your vehicle’s maintenance we recommend that you download and print out our Current IFS Routine Maintenance Schedule. You should keep a copy of this file in both your vehicle and with your vehicle’s records.
If you have an IFS system with manual lock-out hubs then you have our first generation IFS system. This system was incorporated for one year, 2002. This hub and bearing assembly is of a serviceable style. For this IFS 4x4 system please download and print out our 2002 IFS Routine Maintenance Schedule. Again we recommend that you keep a copy with your vehicle and with your vehicle’s records.
Another Quigley GM 4x4 option was a solid axle leaf spring suspension 4x4 system. Our solid axle GM units consisted of a manual lock-out hub, which are of a serviceable hub and bearing assembly. For this type of Quigley GM 4x4 vehicle please download and retain a copy of the GM Solid Axle Routine Maintenance Schedule for your records as well as a copy in your vehicle.
The final Quigley GM 4x4 system was a solid axle coil spring suspension. This style coil spring suspension ran from 2006 – early 2009. Our coil spring suspension utilizes a non-serviceable hub and bearing assembly. If you have this style Quigley 4x4 system then please download and retain a copy of the GM Coil Routine Maintenance Schedule for your records as well as a copy in your vehicle.
If you have any question or are unsure of your style Quigley 4x4 GM please contact our customer service department and supply us with either your entire Vehicle Identification Number or VIN or the last 8-digits. We are never more than a phone call or email away.