As a followup, today I removed the vacuum shift assembly to see what was going on. Immediately figured out something was amiss because I could hear parts rattling inside. upon disassembly, found that the actuator rod had become unscrewed from the diaphragm. Cleaned, rebuilt, reassembled, and...
ok crawled under it some more this evening and this is what I "think" is happening, but y'all know better than I.
first of all, I can't get any movement from the vacuum shift at all. I'll try a few more things tomorrow to verify this.
when I take the side cover off and actuate the shifting...
yes I did check this. I get alternating vacuum on both hoses when pushing/pulling the FWD button. so I'm assuming the front system is working correctly.
wanted to consult the experts on something that has me stumped.
executive summary - I accidentally shifted my '68 into FWD, and then couldn't get it back to 2WD. tested vacuum lines and they are working. replaced them anyway with new just in case. it certainly appears as the vacuum shifter on...