REAR AXLE AND SUSPENSION U-Bolt Torque NOTE Whenever possible, torque all fas- teners on the nut end, not the bolt head. NOTE Rear Suspension U-Bolts, Grade 8 (lubricated*) To ensure an accurate torque read- ing, use properly maintained and calibrated torque wrenches. Clean the nut and bolt. No dirt, grit, or rust should be present. Rear Suspension Fasteners (Metric and Standard) Do not operate the vehicle if the U-bolts are not properly tightened. Loose U-bolts will cause the axle to not be properly secured to the suspension, which could cause loss of vehicle control and an accident. Loose U-bolts can also cause un- even tire wear and poor alignment.
Failure to comply may result in death, personal injury, equipment or property damage. WARNING! 5 Load the vehicle to its normal gross weight before tightening U-bolts. Loading the vehicle (03/17) Y53-6077-1B1 5-133 U-BOLT SIZE DIAME- TER THREAD TORQUE** Nm Lb-Ft 3/4 333-408 245-300 7/8 598-734 440-540 1 925-1,060 680-780 1-1/8 1,470- 1,660 1,080- 1,220 1-1/4 1,890- 2,120 1,390- 1,560 1-1/2 3,130- 3,860 2,300- 2,840 *Chevron Zinc Lubricant or SAE 20/30 oil should be used on U-Bolt threads **Torque requirements apply to manufacturer proprietary suspensions. All other suspensions must refer and adhere to original manufacturer's shop manual.
SIZE/ TYPE TORQUE * Nm Lb-Ft M16 nylon- insert nuts 163-217 120-160 M20 nylon- insert nuts 352-460 260-340 M20 all- metal lock nuts 427-475 315-350 1/2 in. nut 109-122 80-90 3/4 in. nut 394-462 290-340 1-1/4 in. nut 1,877- 2,217 1,380- 1,630 * Torque requirements apply to manufacturer proprietary suspensions. All other suspensions must refer and adhere to original manufacturer's shop manual.