The switches are the same for either 2wd or 4wd, and as long as t was from the same generation rig you should be fine.

Have you checked the FSM(at the top of the forum) for tips/hints, the '85 FSM should work for the '88.

You could still have other issues with the blinker switch in the steering column, I think the flasher is on its own system.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed