I had issues with the van having the incorrect clutch fork and weird repairs by previous owner(s) because of that. The z-bar had been cut and welded to make the fork work and the clutch linkage was butchered as well. The clutch never fully engaged and the van was a bear to drive, consistently grinding gears and caused stress on the whole shifter mechanism. Driving the van home from a local cruise night I was having more trouble with the clutch then usual and ended up busting something within the 3spd mechanism. The whole shifter would travel almost 180 around the steering wheel and wouldn't pick up any gears. Ended up stranded in an intersection, at night, with no hazard lights, fun stuff.
First, I had to make all the clutch linkages right. Figured out the engine was replaced with a later /6 and bell-housing from a 70's era car. They never bothered to swap the clutch fork and instead butchered everything else. Turns out the right fork is the same as a '65 Mopar B-body (part #2401739), had to replace the pivot for the right fork to attach correctly (part #2266819 same as a 66-67 B-body small block). Sourced an NOS zbar/ torque shaft from https://www.hiltopautoparts.com/ (part #2239667) and a service kit from http://www.brewersperformance.com/ (Search part #CSK on their site, same as 4spd kits). Found a guy selling NOS clutch release rods on ebay: https://www.ebay.com/itm/1964-65-66-67-68-69-70-71-Dodge-Fargo-A100-A108-CLUTCH-RELEASE-ROD/361622542961?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
This sorted out most of the clutch issues and made the clutch 1000x better to use.
Then I moved onto the three speed shifter. Originally I had taken it off, cleaned it up, replaced the bushing, washer, and sleeve. Once we got it back together and re-greased it, we learned the upper lever was stripped out hence why the shifter wouldn't pick up a gear. So then I spent a lot of time digging through a Mopar parts book and scoured the internet for every piece to basically completely rebuild the mechanism. I have plenty of pictures and a diagram attached, part numbers and sellers listed below (I didn't replace the pin):
Bushing: 2201259 (http://www.dpmotorparts.com/homepage.cfm)
Washer: 2201260 (https://cjmotorparts.com/nos-mopar-parts-inventory)
Cup: 2201258 (http://www.dpmotorparts.com/homepage.cfm)
Retainer: 2123129 (Ebay seller only had one)
Support: 2225707 (https://cjmotorparts.com/nos-mopar-parts-inventory)
Lever Upper: 2201771 (https://cjmotorparts.com/nos-mopar-parts-inventory)
Lever Lower: 2201772 (https://cjmotorparts.com/nos-mopar-parts-inventory)
To get the shifter mechanism off its easiest to remove the grill. Disconnect the shifter rods and move aside. Unbolt the u-bolt that holds the mechanism onto the steering column base. Note the general spot where its seated. Remove the grease fitting and rotate the sleeve till you can see the pin. With a small pair of needle nose pliers you can pull the pin right out. You have to pull the steering wheel, really good write up on that here: (https://vintage-vans.forumotion.com/t50537-steering-wheel-removal-a100). Theres a lockwire/ washer that comes off as well. Loosen up the support bracket for the steering column and now whole column can be pulled up. Best to have a friend around for the next part. Slowly and gently lift the column up and out. This will pull the shaft that goes from the shifter down to the mechanism with it. Have someone hold the mechanism, the column only needs to come up far enough so the mechanism can wiggle off in one piece.
I put all the new pieces together, greasing everything along the way (Used Mobil One Synthetic, so much cleaner to work with then regular grease.) Stuck a socket extension through the whole thing to help it all align. With help raise and lower the steering column to get the mechanism back on. Align it so the pin can get tapped in and rotate the sleeve to replace the grease fitting, this essentially locks everything in. The steering column can get put back together and the mechanism can get bolted back to the column, you can get some adjustment out of it by moving it up and down on the column base before tightening it down. Add some more grease and it should be good to go.
I also went ahead and replaced the washer and grommet on the end of shifter linkages at the trans. Part numbers and sellers below:
Bushing: 1676200 (https://cjmotorparts.com/nos-mopar-parts-inventory)
Grommet: 1941699 (Central Ave Chrysler of Delco had them listed on amazon)
Hope this helps! Highly recommend Central Jersey Motorparts, Hiltop Autoparts, and Brewers Performance.