Does any one know what the size of the bolt that holds the torque arm bracket togeather is. I am not meaning the head of the bolt i am needing the thread size. i lost mine one night while I was driving. how i don't know but it is gone. i don't really want to go buy an assorment of bolts and try them and prey that one of them works. one more question does any one know what is different about an 83 and a 90 torque arm? I have both but don't really feel like pulling them both and swaping them with snow on the ground. thanks in advance.

The difference is that there is a lip on the clamshell that holds the rubber bushing for the torque arm. It is located in a different place on the two different styles. As long as you use the bushing and clamshell from the same source the mounts are interchangeable. In other words if you use the '83 assembly it will work on the '90, and vice versa.