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Does it have manual locking front hubs? Some people fit these to full time four wheel drive vehicles to reduce driveline effort and increase fuel efficiency. The issue is that the drive from the transfer case will find the path of least resistance which if the front hubs are not locked power will be sent through the front diff and only spin the front drive shafts. To ensure drive power is sent to the rear diff the centre diff needs to be locked. If you do have manual locking front hubs try putting them in the locked position and leave the centre diff button off and try going for a drive.
Unless you have a positraction rear differential, I'm surprised that even three are turning! Four wheel drive is really two wheel drive because both differentials are "open" type. In an open diff, only one wheel has power at any given time. With a positraction, or "limited slip" rear diff, both rear wheels push with fairly even force but the outer wheel is allowed to slip when going around turns. Only true four wheelers have either a limited slip on both ends or "locked" units but it is impossible or really difficult to drive anything like that on the street. If you hold the left front wheel from turning unless the locking unit is broken, the right front should turn.
Do you have the front hubs disengaged and the shift lever in 2wheel drive. If this is the case, the tyres will fight against each other while turning on bitumen.
diff lock displays on dash and is opperated by a dial to the left of the steering column. the center diff lock is operated by a button in the center dash and locks your center differential, making your front and rear driveshafts turn at the same speed. the front and rear differentials lock either your front or rear or both differentials making each wheel on the same axle turn at the same speed. all of these features are for increased traction in off road and wet conditions and situations
it is usually the sensor or the control button itself on the dash if you have an owners manual check in there for a fuse or a relay if no manual look under the dash on drivers side for the fuse box and under the hood for the relay box
Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)
The button is to lock the central diff to distribute the power 50/50 front to rear when in slippery conditions,
Normally with button off the drive system favours the front wheels.
There is an electric motor that engages drive. Mine was stuck and a mechanic beat it w a hammer while I was in vehicle w brake on in drive pushing the diff 4wd buttons. It freed up and started working fine!! It looks like a small starter under car on passenger side.
Or buy one on ebay for cheap and replace it
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