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Re: manual locking hubs
YEs it requires a kit. Can be pricey, most people who are big off roaders or hard core applications use manual locking as they are more reliable but if its your daily driver and you dont often go from 4x4 to 4x2 then automatic can be convenient.
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its time to rebuild the hub you can pick up the new one at auto zone advanced auto napa
this is very easy to do they come with step by step instructions
its common for the hub locks to get sharp edges and get misaligned and hang up
You probably have blown drive hubs. Do you have to engage the hubs at the wheels? If not and they are automatic locking and they are probably blown or seized into the unlock position. They are not too expensive to replace with manual locking hubs (My Suggestion) but the autolocking hubs are expensive. When you take the caps off the front drive spindles and try running it again you may see the axle turning inside but not the wheel. That is the best test. Wish you luck!!
The autolocking hubs are vacuum actuated. If they don't lock then you most likely have a vacuum leak somewhere. This usually occurs where the vacuum line (black rubber hose) attaches to the knuckle on the inside of each front wheel. These hoses get dry and crack. Another simptom of this leak is the AC changing from front vents to defrost vents when you switch to 4x4 so check for this. You could also have a vacuum leak in the hub diaphragm or one of the orings in the hub could be cracked or broken. If you cannot find a vacuum leak then the vacuum solonoid valve may be bad.
chances are that your one of your auto locks have when out on you you can replace them with the manual locking type if you dont mind getting out and locking the hubs in. and a plus to manual locks is that they are much much stronger
Manual hubs are worth getting. I have found them on a few LS models at junk yards. CV axles are the same for auto or manual. A dab of mid-strength threadlock is vital to keeping the handful of 8mm bolts tight. Patients is key for this job & a set of clip removers.
When you change your CV axle there are four bolts that remove the ball joint bracket. It is a fairly simple job once you do it a few times. I refuse to invest in a boot crimper (I REALLY need to get one)for the CV boot clamps and always pay the price because if you get the difficult boot rings they are a hassle. Mike W
Most likely vacuum problem. Does the A/C blow out of the correct location? i.e if you have it set to vent does it blow out of the vents? If not, then you have a vacuum leak somewhere. The vacuum lines to the autolock hubs is a common problem.