5vz swapped '93 T100 ADD not engaging
 

Been fixing up my manual 5vz swapped T100 and noticed that the ADD wasn't engaging when shifted into 4wd. Checked the transfer case switch and VCVs and they're all working fine but it doesn't seem that the system is getting any vacuum from the engine. The vac lines were already on the junkyard engine I swapped and plumbed up just fine but I don't think the vac line for the ADD was connected right. Does anybody have a picture of where their vac line connects to the engine/an explanation of where they get vacuum for the vacuum canister that connects to the ADD solenoids? Thanks!
-Thomas

I'd just disconnect the ADD system and put manual hubs on it.

Lol yup that's the conclusion I got to as well. Makes it more robust and saves me a lot of vacuum hassles. If anybody is selling manual hubs let me know because I haven't been able to find a pair at any junkyards nearby and I'd rather not buy some crappy offbrand pair off Amazon.

It's also worth it alone to simply save your CV joints.

Do you get the 4x4 dash light?

Yeah. The 4x4 switch in the T-case works fine and was sending power to my vacuum solenoids/up to the dash indicator. I ended up just doing the ADD delete last weekend and slapping on some manual hubs. Works great and glad it's more robust now.