47steps in the factory FSM book covers that. answer yes.
SOURCE: 96 chevey blazer 4x4
Sounds like the front axle electric actuator is bad. these are mounted on the front differential housing. they are known to go bad.
SOURCE: 4x4 won't engage
I had similar issue with my 1997 f150. Dash said it was in 4 X 4 but it was not engaging the front end. It would "change gears" to low range in 4 lo so transfer case was moving. I found that to the firewall side of the battery is the shift solenoids and there are vacuum lines to them well long story short battery acid made the plastic lines very brittle and they broke. so not vacuum to the solenoids. so not vac to the differential so no engagement
SOURCE: 1990 subaru legacy 4x4 problems
This transmission has a 4 wheel drive unit on the back of the trans this has a known fault which this unit could have, take to your local trans specialist and he will be able to verify and qoute, You also could check the fuse for the 4 wheel drive. normally in the fuse box under the bonnet marked 4wd or awd, this also would cause your fault.
SOURCE: 95 blazer 4x4 4 wheel drive not working
There is a vacuum actuator mounted on the front differential that locks the shafts to engage four wheel drive.
SOURCE: 1987 Jeep YJ [Wrangler] so owner ship says''
Our Jeep Wrangler YJ's are equipped with a vacuum module on the front axle. It is used to engage the front axle when the transfercase is shifted into 4WD. Check the vacuum lines on the front axle to make sure they are connected. The passenger side axle shaft has a disconnect sleeve that is moved left and right by the vacuum.
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