For 87-98 Chevy and GMC trucks or SUV's: Measure the distance from point A (on the bottom of the frame to Point B (on the side of the frame). The hole on the bottom of the frame is slotted and may frun from front to back or from side to sied. See Image 1 for measurement and Chart 1 to determine the correct bracket.

CHART 1 If Measurement is: 5000 LB Bracket 5000 LB XL Bracket 8000 LB MX Bracket Approx. 1 1/4" 131-2 131-17 131-3 Approx. 3" 131-1 131-15 131-8

For 99 and newer Chevy and GMC Truck or SUV's: If the tow hooks are bolted externally to the bottom of the frame, use the instructions above for the 87-98 Chevy and GMC trucks and SUB's. If the tow hooks are bolted internally in the frame rail use Chart 2 to determine the correct bracket.

CHART 2	5000 LB XL Bracket	8000 LB MX Bracket
1/2 Ton 2 Wheel Drive	199-8/199-1	199-9/199-3
1/2 Ton 4 Wheel Drive	199-1	199-3
3/4 Ton 4 Wheel Drive	N/A	3101-1
3/4 Ton 2 Wheel Drive	199-8	3101-1

For 1/2 Ton 2 Wheel Drive Only. Check front suspension for torsion bar or coil spring. If you have trosion bar use 199-1 XL or 199-3 MX. If you have a coil spring use 199-8 XL or 199-9 MX.

For 3/4 ton 2 Wheel Drive with Torsion bar use 3101-1.