1992 GMC Sierra "vac hub" Questions

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4x4 light does not come on when shifted into 4WD, transfer works but dont think hubs lock? very common for the vac, actuator on the frt. diff. to go bad..

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...vac switch driver side hub and intergrated wheel hub When you say no vacuum leaks, is this specific to the driver's side IWE ( Integrated Wheel End ) ? Did you hook up the vent and vacuum line ...

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...f150 4 wd does not engage right. without more info, you probably have a locking hub problem, they are vacuum operated, there are seals that go bad and you lose vac to the hub then hub doesnt

...f150 This sounds like the front hubs are trying to engage. This motor/4wd is real susceptable with vacuum problems. I let my oil get real dirty and it caused the low vac.The dealer performs vac test ...

I n need a circut for the vacume in a 2001 Ford F250 7.3 Diesle Vac pump runs continualyy These Vehicles have vac going to the auto hubs & to the dash. My vac pump runs continual, if you block the

...vac hubs only as the rear is constantly driving, is it a east west motor or north south , that will tell you a lot I fought the weak front hub vacuum system for years. Installed manual WARN hubs ...

...on? This sounds like the front hubs are trying to engage. This motor/4wd is real susceptable with vacuum problems. I let my oil get real dirty and it caused the low vac.The dealer performs vac test ...

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...kicks out when in 4x4 This problem is ocurring in a 1999 Ford F250 you are loosing vacuum to hub assy. must have vac. to pull/push interior gears to mesh together against lite spring

hubs wont lock in auto position, only in manual position There is probably a vac. leak in the hoses. The front hubs are vaccum actuated.

...to be coming from front drivers side behind tire ... no vibration, no shimmy, ... make sure the vac system is operating good if vac not working properly hubs will partially engage making nasty ...

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