Fat Bar Instuctions
Congratulations on purchasing the best “working” 4-bar kit on market. The FATBAR has many features that allow it to out-perform the competition. You will notice them as we go along.
1. Every step of this installation is based on the rear axle centerline (C.I.). So locating the C.I. is very important. Set the chassis level and project the C.I. from the axle housing onto the frame with a level, or plumb-bob. If the bed is handy, set it on the frame and roll a tire under to check the C.I. – Sometimes we want to move the C.I. from its stock location to center the wheel in the fender. Double check your chosen C.I. by measuring to several points on the chassis cab mounts, bed mounts and front C.I. to make sure it’s even on both sides (square).
2. Remove all of the original suspension, and mounts from the chassis. None of the rivet holes will be re-used. We suggest that you put grade #8 bolts in these holes and then weld the crossmembers back in. NOTE: 48 – 60 Ford’s & 55 – 59 Chevy’s may want to re-position the rear crossmember to make room for a custom tank. It’s easier to do it right now.
3. Carefully measure the C.I. 36” forward on the chassis double check this. Mark the outside of the frame with a level line up and down.
4. Fit the front brackets to the chassis wit the front edge of the bracket on the line at 36”. 5. At this time, consider boxing and ‘c’ sectioning the rear frame. This is a must on air ride trucks, and recommended for those going to sit low. – we have rear boxing and c-sections available.
6. Assemble 4 of the bars to a length of 30 ž”. This is a measurement from the center of one eye, to the center of the other. Set all 4 bars to the same length of 30 ž”.
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