When in 2wd my front driveshaft spins freely. When I switch from 2wd to 4wd the front driveshaft won't spin freely so I know the transfer case is working but won't engage the front diff. Is there an electronic actuator that engages the front different cause while in 4x4 and front tires off the ground. If I spin one of the front tires...the other side doesn't do anything. When I bought it used. The guy told me that it was stuck in 4x4 but he fixed it. I'm wondering if he disconnected something.
SOURCE: 1999 GMC Sierra 4WD -
Hi,
The most common problem with this is the clutch packs in the transfer case, they sound like like are not locking up the front diffs properly and may need to be adjusted or replaced.
You need to do a pressure test of the fluid transfer section to ensure that there is the correct pressure to engage the clutch packs then if thats ok start to look at adjusting these.
Let me know if you need more infromation.
Thanks
Jason
SOURCE: 4wd not working replaced actuator when i press
Sure sounds like the vacuum switch is not working properly. You have done exactly what I would have done, start with the actuator(most common problem) and go from there. If your not getting the vacuum , then most likely the vacuum switch is your problem.
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