This chassis squaring jig is designed to square the rear end housing to the chassis. To use simply remove the Wide-5 drive flange and install the chassis squaring jig on the hub. Next run a string parallel to the right side frame rail and measure from the string to front pad on the chassis squaring jig and then to the rear pad on the chassis squaring jig. Adjust the rear end so that both measurements are the same. Next run the string across both pads of the chassis squaring jig to the front of the car and square the right front tire to the string.