Alright guys and gals

I’ve got this WEIRD issue.

Yesterday while on the highway my delica started to buzz from underneath. I pulled over and as soon as I stopped the wheel lock indicator light turned on. I put it in reverse and then it went away and went about my day no problem.

Later I got curious and in a parking lot I put it in 4hi then 4lo and made sure everything work. Back to 2hi and then reverse and back out. Indicator light goes off and I start heading home and about a block later the light pops back on and the same clicking/buzzing comes back on. Van won’t full disengage the front driveshaft :/

I’m going to start small and replace the linkage bushings at the tcase anyone know the part number for them?

Has anyone seen this before?