It's interesting that bolt torques vary quite a bit. In the MORryde instructions for installing their pin box, they have torques for both grade 5 and 8 bolts. Our pin box came on the rig and had a mix of grade 5 and 8 bolts, but now have all grade 8. The torques recommended by MORryde are as follows:
1/2 X 13- grade 5, 65 ft lbs - grade 8, 80 ft lbs
5/8 X 11-grade 5, 135 ft lbs - grade 8, 170 ft lbs
3/4 X 10-grade 5, 220 ft lbs - grade 8, 280 ft lbs
The chart also stated all these torques were for zinc plated bolts, so there is a difference there too, between plated and not plated bolts as far as torque ratings.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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