1) 4 low lock is automatic in ABS equipped vehicles. ABS was optional in 93-94 and standard equipment in 95-97. If you want to manually control center differential locking you will need to add the switch (and alter the input to pin7 of the CDL controller, if you wish to retain the low range...
Close. Some 93-94 vehicles also do not have viscous couplers. ABS was optional in those years. That being said, the vast majority of 93-94 vehicles do have ABS.
95-up transfer cases have a dampened counter-weight bolted to the case. I do not know the reason the counterweight was added, unless...