This sytem is shift on the fly!! you can engage and disengage from 2wd to 4wd at speeds up to 45-50mph, 4wd lo you need to be a complete stop some cars need to be in neutral with parking brake on and some need to be in gear there all different, consult your owner manual for correct shifting pattern to 4wd lo range
SOURCE: 93 Jimmy Electronic 4 Wheel Drive
If the Blazer is the same Year. I think the years are 1992 to 1994 will work as long as it's the 4L60E, and you have the manuel transfer case to activate the 4WD.
Good luck and keep me posted.
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