auto 4WD ?

firefooll · #1 (**permalink**) 02-08-2008, 05:20 PM

i have auto 4wd there are two lines going to my hub one a brake line and the other i assume is the vac line and i have a vacuum pump on my pass side fender, my question is how to tell if the vac pump is engauging my hubs. also there is not a an auto of free poisiton on the hub it;s self.

**Dave** · #2 (**permalink**) 02-08-2008, 05:23 PM

The auto and free words are probably worn off like mine were. Left is auto right is lock. As to how to tell if they are engaging, one way is to lock it in drive ahead turn slightly If the front is pullin they are locked. Or you could lock it in drive ahead a little jack the front of the truck up spin the front wheels by hand if the ujoints in the front axles turn you are locked in

firefooll · #3 (**permalink**) 02-08-2008, 05:29 PM

i was stuck in the mtns when i first had this problem. I turned the nob in the cab and hit the gas nothing happend.....i locked the hubs manually and we were rocking&roling through the snow. i guess my real question is what could be bad that i can replace?

**Dave** · #4 (**permalink**) 02-08-2008, 05:31 PM

Do the hubs turn freely when you engage them manually, If they do you have a vacuum leak. You might be able to replace the vac seals on the hubs. What alot of people including myself do is replace the hubs with Warn manual hubs for about 150. replacement Auto stock ones are 350 a side

firefooll · #5 (**permalink**) 02-08-2008, 05:37 PM

yes they turn freeley. i really don't want to replace the hubs. i have MAZZI wheels on it and it has hub covers. so i have to take the covers offf to manually lock the hubs. i bought an allen wrench just to do this.... i almost took a hammer to them when i was stuck.

**Dave** · #6 (**permalink**) 02-08-2008, 05:40 PM

my advice would be to check for vac leaks first then and replace the hub seals then

firefooll · #7 (**permalink**) 02-08-2008, 05:46 PM

will it be a contsant leak...should i check the lines with soapy water. or check the pump on the fender with soapy water... and how do i check the hub.....i dont know what to look for.

***vitalidle*** · #8 (**permalink**) 02-08-2008, 05:50 PM

Not sure if there is a place you can put a gauge inline to see if its holding vacuum

I bet there is though.

**Dave** · #9 (**permalink**) 02-08-2008, 05:51 PM

The easy way to tell if it is a constant leak is use you heat ac control to go from floor to defrost. If it defaults to defrost the leak is constant.

Here is a link on the hub seal and lubrication
Welcome to guzzle's 4x4 Autolock Hub Lubrication Maintenance Web Page

firefooll · #10 (**permalink**) 02-08-2008, 06:00 PM

Dave you are Awsom Thanks
MJ

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