Does anyone know where I can beg borrow or buy GM tool HM-592-----a kingpin reamer, or at least know what dimension one should ream the bushings for the 0.682 kingpin??? it should be 0.682 or a little more.

 

Did you check kanter?

 

if there is a shop in your area that works on trucks [ big rigs ] they may have what you need.the shop that I work at has adjustable reamers,sizes from .5 inch up to 2.5 inchs.

 

You might want to consider a roller conversion kit, has stainless kingpin with bearings top and bottom that are easily greased. I installed a kit in mine about 5 years ago, very easy to do, I don't remember how bad my stock ones were worn but you can find the kits on line. Chuck