Not sure what "frame" bolts you mean? Isn't your frame riveted? Shackle/spring eye bolts may be fine but what else? Possibly other suspension hardware like shock bolt? Steering adjustment? Can you describe these bolts? Usage, size/pitch?
Where nut an bolt are used, use coarse. Absolutely no reason for fine in those cases.
The normal NO. 10 screw is fine. 10-32.
Large majority of your bolts will be UNC.
Gr 5 is plenty strong for anything on your truck.
For our trucks: Coarse is plenty strong and torque-able. Fine is only necessary if forced by the design or available parts.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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