ken

Kenny's right. The pins with the head is the wrong pin. The ones that use a kotter pin on both sides are much stronger! I have broken them too but it takes a much bigger load to break them.
Mine orignally had the stamped steel mounts from the winch to the frame. I broke the pass side one tring to get out of wet sand at the beach. I got the newer ones with the welded steel gussets from memphis. Much stronger. They must have went to these pins because they where breaking the pass side mount. If your shearing pins, I'd get a snach block with at least a 8' wheel. That will cure a lot of worries.
I aslo use the trucks wheels when stuck to help the winch. Low range and 1st gear.