Article 1986 - Alternate Toe-In Checking Procedure to TSB # 117, Article 1824, Dated June 13, 1969

TSB No. 126 - November 7, 1969
(1965-70 F-100/350, 1969-1970 E-100/300 Trucks)

The following front wheel toe-in checking procedure is suggested as an alternate method to TSB No. 1824.


    1. Inflate all tires to required pressure.
    2. Check front axle pivot bushings and radius arm to frame bushings for excessive wear or deterioration. Replace if necessary as outlined in the 1970 Truck Shop Manual.
    3. Check front wheel bearings for proper adjustment. If necessary, adjust bearings as outlined in the 1970 Truck Shop Manual.
    4. Check both front tires to assure they are the same size, ply rating, load range and rolling radius.
    5. Torque spindle pin lock pin to specification (40-50 lbs. ft.)
    6. Check spindle pins and/or spindle bushings for evidence of excessive wear. Grasp each tire at the top and bottom and shake the wheel while watching the movement of the brake backing plate (or disc brake support). If the brake backing plate moves more than 1/32 inch, replace the spindle pins and bushings as outlined in the Truck Shop Manual.
    7. Check tie rod assemblies and drag link assemblies for loose and/or worn rod end assemblies. If necessary, replace as outlined in the 1970 Truck Shop Manual.
    8. Check front spindle steering arms for loose attachment to front spindle assemblies. Torque to specifications.

The following procedure should be used for checking front wheel toe-in using a trammel bar:

Position the truck on a relatively level surface with both wheels in a straight-ahead position.
    1. Raise both front wheels off of the ground.
    2. Using chalk or a suitable marking medium, mark a strip approximately 1/2 to 1 inch wide in the center of each tire tread, turning each wheel to get an even distribution around the tire circumference.
    3. Using a suitable scribing tool, scribe a mark in the chalked (marked) section of each tire by slowly rotating the wheel/tire while scribing the mark.
    4. Place a chalk mark on the outside side wall of both front tires to be used as a "reference mark". Mark each tire in the same area.
    5. Lower both front wheels to the ground.
    6. Move the truck forward and reverse several time to normalize the front suspension.

    NOTE: Move the truck forward and/or reverse only until the reference mark on each tire almost contacts the ground, being careful not to destroy the scribe marks indicating the center of each tire tread.

    7. With both "reference marks" pointing to rear of vehicle and using a trammel bar, measure the distance between the scribe marks (center of each front tire) of both front wheels at the "reference mark" area. Record this measurement which is the "rear of tire" reading.
    8. Move the truck forward so that the "reference mark" of each front wheel now points to the front of vehicle. Using a trammel bar, measure the distance between the scribe marks on the center of each wheel at the "reference mark" area. Record this measurement which is the "front of tire" reading.
    9. Subtract the above "front of tire" measurement from the "rear of tire" measurement to obtain the "toe-in" measurement of the truck.
    10. If the toe-in measurement is not within 1/16 to 3/16 inch, then the toe-in must be adjusted to obtain 1/8 inch as outlined in the 1970 Truck Shop Manual.

NOTE: It is re-emphasized that front wheel toe-in is specified at the vehicle's normal operating ride height or suspension position. Because excessive toe-in is the primary cause of excessive tire wear for vehicle applications which do not involve abnormal cornering, it is the the first alignment criteria to be checked (and adjusted) during correction of tire wear complaints.