UNEVEN TIRE WEAR-OUTER RIBS REVISED WHEEL ALIGNMENT SPECS.

UNEVEN WEAR-OUTER RIBS ON CORVETTE TIRES 1984-86 CORVETTE

TO: ALL CHEVROLET DEALERS

Some 1984-86 Corvettes may experience uneven tire wear on the outer ribs of the front tires (if the toe-in on the rear tires is severe, the rear tires may experience this wear also).

To eliminate or minimize this type of uneven tire wear, check the alignment on a 4 wheel alignment machine and reset both front and rear sum-toe to 0 +/-.2 degrees. Set the rear wheels first.

The toe specification was changed on February 21, 1986 for factory setting and service. Any cars built after this date (VIN 120992) are built to the new specifications. OLD REVISED ---- ------- Front Sum-Toe .3 +/-.2 degrees 0 +/-.2 degrees Rear Sum-Toe .24 +/-.15 degrees 0 +/-.2 degrees

Labor Operation Number : E2020 Labor Time : 1.6 Hours

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.