IWE vacuum system upgrades

[FordTechOne]

I had the grinding effect due to the vacuum leak. I replaced the front hubs and vacuum check valve with the solenoid since I have 170,000 miles on the truck. Come to find out I still had a grinding sound...I figured it out to be the vacuum reservoir. Capping off the hose going to the reservoir solved the problem. Should have just done that first

So you capped off the vacuum reservoir so the hubs are engaged full time?

 

[1BAD454SSv2]

I fought this for a while on my Gen1 , it would hold vacuum in driveway all day long , at certain speeds 45 ish and 75 , it would lose vacuum and grind or i would get loud pops sometimes when i did want to use 4wd , replaced hose's , iwe , solenoid . Finally gave in did full RCV axles and Eliminators . Never looked back.

 

[DS550]

So you capped off the vacuum reservoir so the hubs are engaged full time?

I capped the tube going into the reservoir and the hubs are not engaged. Small hose (red circle) going into the vacuum reservoir is plugged. I probably won't be able to engage 4x4 right now since the check valve is holding the vacuum unless the solenoid releases the vacuum. Reservoir was ordered from Ford and I will have it Monday.