I have a 1988 GMC Fullsize Jimmy 4x4. It has a 6-inch lift with 36" Parnelli Jones tires. My problem is that I keep breaking the steering arm studs that hold the steering arm to the top of the knuckle. There are three studs and it's the front two that seem to break and the back one is fine.I've had to replace them twice know and have just snapped them again. The truck has a drop arm to restore correct arm angle but still breaks the studs. Anyone got any ideas whats causing this and a fix for it?  

Let me take a stab at it. First you are really kinda pushing the axle limits here and I suspect that you are maybe running a locker up front which place a LOT of extra stress on front steering. When you replace studs, what grade bolts are you using and how much are you torquing them because when you over torque them you can actually weaken them to shearing. (BTW the rear bolt is not shearing because it is furthest removed for tie rod and act as a pivot to shear other two)  

There's no locker...stock gears in the front....3.73 and got the replacement studs from LMC Truck so they're the right ones. Torque was set at 80 65 ft/lbs.. I believe we got that from a chiltons manual....not sure.  

You need to look for some grade 8 or grade 10 studs from another source. Also was it 80 or 65 ft lbs? I would think no more than 65 here and maybe a bit less. Those bolts should have fine thread and 80 Ft Lbs is a lot of them as far as preloading the stud shaft as it can place 5000 to 7000 lbs of pull on stud body and if it is 1/2 inch it is going to fail at around 24,000 lbs of pull/stress (assuming a grade 8 bolt) 17,000 with a 7/16 and around 13,000 with a 3/8" one. If you have right studs and torque and it is still shearing then you need bigger studs.