There are no lights working on the 4x4 switch and pressing any of the buttons (2x, 4hi, 4lo) do not make any sounds which indicate switching. The Jimmy will also run fine with no shifting problems until about 5 minutes into my drive coming off of a stop. There is a slow shift from 1st to 2nd and a jolt when it does so. IT goes into the other gears fine and downshifts fine as well. There is also a light winding sound that get's louder when reaching higher speeds.
Change the switch itself if it drives normal then randomally kicks into 4 lo/4 hi i had the same problem and a transmission shop told me it was the vaccum and the transfer case but one of my mechanic friends told me that it was my switch and shops only tell you other things for the money. Try changing the switch.
SOURCE: on my 2000 chevy S10
vacuum leak or vacuum locker solenoid problem. a great way to check for both is to remove both vacuum lines from the solenoid (located on firewall above destributor), and put a connector between them, push the button on the dash and see if it locks in.
SOURCE: i have a 97 gmc jimmy 4x4. the transmission goes
I need the CODES this year has valve body problems for tcc slipping on these & shift timing need more information
SOURCE: 95 jimmy 4x4 drive acting weird.
Eh! I gotta google too. :) The Ecu computer controls so much on these vehicles these days that the dealers aren't equiped tofix their own makes.. It is possible like the other post sai, that there is some form of bsd connection. I figure the computer controls the information highway and keeps the operator informed on the happenings. If I can suggest looking at the transfer case for any electrical that could be talking to the computer Or possibly a sensor that is poorly connected. Is there a particular time or condition like rough roads/off roading or any thing else you can narrow it down to? If you live local to riverside or Mira loma, I would be more than happy to have you drop over and work together on this. I'm retired and home 24/7 and need something to do. Won't cost, a mechanic at a shop would so just let me know. I have a few ideas we can then discuss. It would take a ck list to cover it on here. My name is Ned @909-630-3192. Nothing to lose. good luck and feel free to call.
SOURCE: I have a 2000 GMC sierra 2500 truck. The guy I
-----check possible tps [throttle position sensor ]circuit for damage or faulty sensor----if good check the fuses and trans harness for shorts damage or disconnection,check o2 sensors wiring possible ground to exhaust ,or internal leak 2nd gear apply circuit[servo assembly or 1-2 accumulator] or poor pump pressure
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