Rich. There is a vacumn engagement of the front differential. The switch is on the transfer case. There will be a vacumn motor(looks like a curise control unit if you're familiar with them) under the hood with a cable running to the front diff. Make sure it functions when you engage 4wd. Probably does. If not, make sure it is getting vacumn by removing the line. It should **** on your finger when covered. If this all works properly, you could have trouble in the front diff. Don't forget the simple stuff, like CV joints, axle nuts tight, etc. You're driving an 86 so I assume you have a little experience in maintaince. Good luck. TJ
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A frequent problem with these trucks is the vacuum switch on the transfer case.It is a three port switch screwed in above where the shift lever comes out of the t/case.The switch just screws in,7/8 wrench if I remember correctly.When you remove the vacuum hose connector from the switch,you should hear a vacuum noise for a few seconds.If you don't check for a defective vacuum check valve near the firewall behind the engine,or a cracked vacuum resevoir.One other area to inspect is below the battery. Sometimes battery acid will leak onto the vacuum hose that goes to the actuator causing a leak in the hose,which will disable the four wheel drive.To check for a broken actuator cable,jack a front wheel,put your t/case in 4wd, move the diaphragm manually you should feel the axle lock in...the front tire should not turn by hand
I use to sell these hubs everyday a decade ago. I had one customer buying up the cores so he could rebuild them. I asked what goes wrong with these and his reply was dirt mainly from lack of maintenance. They should be cleaned and regreased every year with new seals. Check you chevy dealer if seals are still offered
Yes if your shock is bad it will MAY have tweaked the bearing just a bit. It doesnt take much at all. When the pressure is off the bearing (ie 2wd) your shock should keep that bearing from moving "Floating" around a whole lot in the hub, when you add the 4wd now you have the drive axle and the shock keeping the bearing from "floating" moving around. 4wd is a more stable for your suspension which helps to keep things in align (hence the more power and stability). You may have a good bearing here, but may have a bad hub. Since you have replaced the hub and the CV Shaft. I would suspect you are having a bearing issue. The bigger question is how and why? Feel free to ask me anything more about this. I am willing to help you in any way I can to help you get this resolved. Is there anything else that you think maybe contributing to this? Anything parts you replaced other than the hub/CV Joint?
i had to put a new trans in my 2000 jimmy about a year ago there is something inside called a "reverse hub" its made from aluminum and not very hard to break..when mine broke i was stuck trying to move in reverse and it heard a pop then a winding down noise and sure enough its the reverse hub to fix it i just had the trans rebuilt