I am looking at replacing the upper king pin on a 92 w250. But a cant find the part any one know were to go and order or get one.

 

They are standard Spicer parts. Available from Spicer or after markets like Moog.

 

https://www.4wdfactory.com/store/categories.php?category=Axle-Parts-{47}-Gears-{47}--Differentials-/Dana-60/Dana-60-King-Pin-Front-Parts

 

Dont just do one, look at both sides and replace both if needed. Alot of the time the kinpins are fine but the bushing and bearing need to be replaced.

 

I got mine from 4x4 factory. be sure to get the wrench as well. you'll need lots of heat and a 4 foot cheater bar.

 

As BILTIT said, examine the actual king pin for wear, more then likely it won't need to be changed. Just replace the bushing, spring and gasket. But honestly, while you've already go it all apart you should go ahead and replace the bottom bearing too, it's not that much more.