1986 chevy blazer four wheel drive acting up

After I drive the vehicle a little while mostly when its cold but it happened over the summer my right front wheel starts moaning very loud when im slowing down ,it sometimes stops after i come to a complete stop but its getting worse about the moaning sometimes the 4 wheel drive works great and sometimes it just doesnt work at all Baffled any help would be appreciated. :banghead:

Sounds like a problem with your hubs.

Yep, those automatic hubs use a drive motor to disengage. They go bad and won't do their job. Once you fix it, rotate the tires too. The sticky hubs will start cupping the tread and that may be a large contributing factor in your noise.