Main Stud Kit 1994-1997 Dodge 5.9L Diesel XDP Xtreme Diesel PerformanceSwap out the factory main bolts on your 1989 1998 Dodge 5. 9L Diesel 12 Valve with the XDP Main Stud Kit XD3016MS. The XDP main studs feature high quality 8740 Chrome Moly construction that also includes a proprietary element added for upgraded strength and durability. A tensile strength between 220K psi and 236K psi and a yield strength between 210K psi and 230K psi ensures these studs can handle the increased performance of upgraded applications. In