Hey Zippy we need to veto these rock sections they are puting us through!
This crack on the frame you speek of. Is this what you think is causing your 4th gear noise? Sounded like a loose motor mount but a loose skid plate would do it. Either way if you need to bring it over to my garage and I can weld it up for ya. Now the skid plate is that also cracked? We can do a job on that too I just need to get the correct wire. I have also helicoiled and used the loctite synthetic thread maker multiple times. Your bolt hole for that fork is too small to give a good helicoil but the loctite would probably work. As long as your axle doesn't fall out i think your good to go.
My rear swing arm, skid pan, and front forks all saw a lot of action this past sunday. DOH! I have an idea for swing arm protectors that I am trying out this winter. I will post pictures on here if it goes well.
Biff!