Please LMK ASAP - have a friend who is stuck right now.

Thanks!

 

Should just be the 4 nuts between them, internally, just a dog and guide, so it should come apart, be careful there is a seal between the two.

 

This might help:

https://www.dieseltruckresource.com/...d.php?t=165546

 

Wannadiesel, you have to go through all that just to seperate the two?

My factory manual just says the 4 nuts and seperate.

 

If it's a non-intercooled '91 then the PS pump drive is pressed into the vac pump. The intercooled '91.5 trucks are like yours, they fall apart when you unbolt the PS pump. I assumed since they couldn't figure out how to get it apart it was the old setup.

 

D'oh!

Remind me to never buy an 89-91 truck......

Thanks, I learn more about these things by the hour......