Symptoms
Steering that wanders or clunks, the steering box moving on the frame when someone saws at the wheel, or visible cracks around the box mounting bolts on a lifted or big-tire truck.
The fix, step by step
- Clean and inspect the frame rail around the box mounting area first, since a crack needs welding before a brace.
- Offroad Design's bolt-in brace for 1967–72 GM 4WD trucks triangulates the box mount to the crossmember and frame.
- It bolts on, but you have to drill one hole.
- Follow ORD's instructions, which note that some frames need washers to space the brace out.
- Re-torque everything after the first few drives.
Tools & part numbers
- Drill and bits
- socket set
- torque wrench
- wire brush
- ORD instructions PDF
Where to buy the parts
Bolt-in steering box brace for '67–72 GM 4WD trucksOffroad Design ↗Amazon ↗
Bolt-in brace clip and hardware only, '67–72 GMOffroad Design ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Chevrolet K5 Blazer (1st generation) parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.