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GMC Jimmy 4WD Problems

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  • Hi,
    My 4 wheel drive will not work on my 1995 GMC jimmy. Mechanic said it was the cable. I have no idea, so I go on the intenet and buy a ACDELCO US 15721261 Trans Shift Cable
    4wd ; 4-speed At (m30) ; Chevrolet (x88) ; Gmc (z88); Years:1995-1996; Per Car Qty:1; from Bestvalueautoparts. You quessed it WRONG cable.

    My mechanic said the cable is about 18" to 24" long. Thats it no other info.

    Does any one here have an idea what cable I need and where to get it?

    Thnaks for any info
    Frank
  • jessejesse Posts: 3
    2000 gmc jimmy wont shift into 4 wheel lo high or auto...the lights on the push buttons just flash then kicks back into 2 wheel high...i dont have a clue can anyone help
  • I have a 2000 Jimmy which did the same thing, First thing is look under the hood, in the middle of the fire wall is a vacuum switch, check and see if all the rubber hoses are connected and you do not have a vacuum leak. then check your push button cluster o your dash, mine was bad and needed changed out. After I did all of that mine works great with no problems. Good Luck my friend
  • caryb1caryb1 Posts: 11
    Thanks for the info. Funny thing is that I did that exact same thing two days before I received your comments. My acuator valve (switch) under the hood was gone. The way I tested it was I taped the two hoses (that go to the switch) together and went into the vehicle and tried the switch again. Worked like a charm. Then I went and bought a new valve/switch and it is still working. Thanks to everyone for their help. I just hope this info helps someone else. Best site every.
  • jbagzjbagz Posts: 3
    i have a 1999 GMC Jimmy 4wd 4 door, i was driving to work when i heard a noise that was getting louder that the stereo. I turned the radio off and listened, at low speed say 10mph it is a clicking/grinding noise, if i put the vehicle in 4wd the noise imediatly stops, when i switch back from 4wd to 2wd decel, then acelerate again the noise comes back, if i go 20mph or more the noise becomes a loud howling sound that gets very loud on decel, but once again if i click 4wd the noise imediatly stops. about 4 days prior to this happening i replaced the heater core, although i don't think there is anything i did to disrupt anything to cause this problem. I did notice that when taking sharp turns in 4wd i heard a clicking sound, so i jumped the gun and replaced the cv shaft on the passenger side cause that is where the noise was, i no longer have that clicking noise although the original problem sound is still there just as bad as it was in the first place. i hear wheel bearings are an issue although i would believe that when puting the truck in 4wd i should still hear the sound. any ideas would be helpful? thanks
    Jon
  • You may as well take it to the shop. Sounds to me like the small gear in your front differential is burred and now wont work right. (hence the noise)

    Only way to fix it is to replace the gear and also the nylon washer in your front differential.

    This problem can be caused by poor vacuum not pulling the cable all the way to fully engage or disengage the gear. once its burred it must be repaired. Also check to see if you have a vacuum problem.

    Just my 2 cents. I had the same symptoms as you and that was my fix.
  • jbagzjbagz Posts: 3
    thanks for the info, to replace this gear does the dif case have to come out of the truck, or is it on the black housing going into the case with the electrical conector?
  • The gears are in the case. I am pretty sure the repair was done without removing the differential from the truck.

    The only thing inside the black housing is the connection for the cable. Parts cost was under $250.00 and labor was under $150.00

    Unless you have a working knowledge of the differential and parts involved I wouldn't recommend doing it yourself.
  • lite is on on 2wd , push other 2 buttons 4wd lites dont come on or ingage 4wds.Its not the cable under the battery. Is there a fuse that controls this? If so where is it located?
  • Under the hood there is a vacuum switch in the middle of the fire wall. Check and see if all hoses are hooked to it. Mine was broken off, as soon as I connected it the 4 wheel drive worked. If that does not do it then have someone check the push button control pad, it could be bad also. Good Luck
  • jbagzjbagz Posts: 3
    ok this is a continuation of my post #164, i had a bad vacuum switch replaced it and now in 2wd everything works great, although in 4wd while turning either direction a get a clicking noise sort of like a bad cv shaft noise, only i just replaced the cv about a week ago. also the 4wd does not engage in reverse, seems to work fine in drive but when i reverse i get a loud clicking/whining sound. any sugestions?
  • I have a 99' GMC JIMMY with 150,000 mile. The milage has been crappy lately.I could drive about 5 miles and i can see a difference in the fuel guage. I had the dealership do the fuel injector service,I also had another mechanic change the o2 sensors since he said that would help the mileage.Is there any other part i can change to help my mileage. I know suv's burn more gas but i dont think i should be seeing a significant drop in my guage when i have only driven about 5 miles or so.
  • kbzookkbzook Posts: 2
    Ok, I do not want to seem repetetive but here goes. My 4wd isnt working, Right now the 4wd hi is lit but it is not engaged in 4wd (only the rears spin). If I try to put it in 2hi or 4lo they blink and go back to 4hi, 4 auto will light up, but again will not lock the front diff. The shop said that the cable actuator under the battery was bad so we replaced it, the old one was still good, it held a vaccum. Looking at the actuator while the vehicle is running it has a constant vaccum (sucked in) which makes sense because the 4hi light is on. When we push the 2hi button it briefly releases then goes right back to vaccum. The relays are clicking under the dash. When the vehicle is shut off it releases the actuator. I tried taking the plastic unit that the cable goes to out of the diff but it wont come out, it pops out about 3/4" then will not come out anymore. The vaccum is good, the actuator is good, the cable is not stuck, and fuses check out ok. Could something be wrong inside the front diff? Or could it be the switch? help......please. 10" of snow expected tonight, 4wd would be mighty handy.

    Kyle
  • kbzookkbzook Posts: 2
    My 4wd isnt working, Right now the 4wd hi is lit but it is not engaged in 4wd (only the rears spin). If I try to put it in 2hi or 4lo they blink and go back to 4hi, 4 auto will light up, but again will not lock the front diff. The shop said that the cable actuator under the battery was bad so we replaced it, the old one was still good, it held a vaccum. Looking at the actuator while the vehicle is running it has a constant vaccum (sucked in) which makes sense because the 4hi light is on. When we push the 2hi button it briefly releases then goes right back to vaccum. The relays are clicking under the dash. When the vehicle is shut off it releases the actuator. I tried taking the plastic unit that the cable goes to out of the diff but it wont come out, it pops out about 3/4" then will not come out anymore. The vaccum is good, the actuator is good, the cable is not stuck, and fuses check out ok. Could something be wrong inside the front diff? Or could it be the switch? help......please.

    Thanks

    Kyle
  • I have been having problems with my 4x4. it would not go into four wheel. The light would blink when I put it in auto, high or low and return to two high. I replace the actuator and checked the hoses. I also replaced the switch on the actuator cable at the transfer case. This problem is recent and of course decided to happen during the winter when it is most need. The vacuum appears to be fine. Any ideas? :(
  • It sounds like the push button assembly on the dash is bad to me, good luck
  • caryb1caryb1 Posts: 11
    In last year I have changed actuator, actuator switch, hoses from actuator to switch, switch on dash, and I resently checked transaxle fluid (fine). Everything was working fine then wham again, won't go out of 2H try auto or 4H or 4L and the light will blink and go right back into 2H. Hear clicking when pressing buttons. Sometimes no lights with light up on dash switch and other times all lights light up and now the service 4 wheel drive came on. I hear that gmc has problems with this the switch on the dash. Do you think it could be that switch again? Have rechecked actuator switch and actuator and hoses. They are fine. Is there any way to check the switch on the dash?
  • Try disconnecting the battery wait 5 minutes then reconnect.
  • caryb1caryb1 Posts: 11
    Already tried disconnecting the battery for 30 mins. didn't work. One question, do you disconnect both positive and negative or just negative cable?
  • caryb1caryb1 Posts: 11
    I have to replace transfer case vacuum switch on my 99 jimmy which is located on the transfer case under the vehicle but do not know where it is located. Anyone have any idea where it is located or where I can get a diagram of the transfer case? Was told by someone they believed it was on top of transfer case. Haynes repair manual does not give diagram.
  • My GMC Jimmy is a 4 button system with Autotrac. I just noticed that the front driveshaft is still turning in 2wd. I have checked the front axle and it is disengaged. I even put the transfer case into Neutral and the front and rear drive shafts are still attached? I've checked all functionalities of the transfer case motor and it seems to be working fine. Also, no flashing on buttons, everything seems to be operating normally. I'm just wondering if this is normal. I checked with a '98 Jimmy 3 button 4wd and the transfer case detaches the front drive shaft. I know this is a different transfer case so I'm wondering if this is normal?
  • i recently bought a 75 Jimmy 4x4.. it has a couple leaks here and there but i continue to make sure i have fluid in everything.. the issue im having started about 3 days ago- ive been driving it for the last month and everything was fine, drove very smooth, but now wen im going about 15-40mph it starts to vibrate and gets worse the more i get on the gas. but wen i get past 35-40mph it stops vibrating and drives great like before.. i have no clue what it can be..if you have any tips for me i would love to here them, please email me at whyteboijon@yahoo.com

    thanks for reading and replying,
    Jon
  • Hi, Any info would be greatly appreciated on this scenario I have. Just had a bunch of stuff done to the 4x4 on my 94. Just had the transfer case swapped out known good one,transfer case switch, vaccum actuator. Did this because the actuator ( I believe it was this one) was sucking tranny fluid from the trans any putting in transfer case. My bro in law has been a mechanic for 20 years and never seen this before. Removed acuator on transfer case and tranny fluid literally shot out like it was over filled by 2qts or more. So everything was replace except the switch on the dash. Coming home from picking it it was fine,2w was no problem. I went back out a few minutes later and go to the top of my street to pull out and you can here a small click kinda noise come from underneath near the transfer case when I was almost completely stopped. I go to pull out and it like its in 4wheel hi by itself. Takes up to 2000 rpms to get out of the street to the main street but drives fine when up and rolling but still at like 2000 rpm's to take off from a stop light. This was happening before everything else was replaced. If you turn it off and wait say a hour or less and come back out to drive its in 2 wheel drive again without touching anything. Main question is is it possible the switch on the dash is falty and able to engage 4w when the jimmy slows down, only does this after you are at a stop like a traffic light. Kinda annoying and don't want to ruin anything. 4wheel low works now with the newer transfer case. 4w hi I'm not sure being it won't go into it with the greenlight showing from a nuetral position while stopped. Does it have to be rolling to engage hi? Thanks for any help, Dan
  • 4w hi doesn't engage at all while rolling or stopped! Not sure what this prob could be. How much other stuff should I check on the Vac lines etc?
  • Kyle,

    I have the exact same issue. Did you ever find out what it was?

    Ryan
  • I have a 98 Jimmy that is stuck in 4wd Hi, although the front tires are not engaged. My problem is stated exactly in a previous question #172 & 174. The dash 4wd Hi light blinks when attemting to go into anything else but then just stays in 4wd Hi. Without stating the same issue over and over please read question #172 and if any one is able to pass on some advise that would be greatly appreciated.
  • caryb1caryb1 Posts: 11
    I have a 99 Jimmy was working fine and now 4wd won't engage. 4wd service idiot light came on. One min all lights are on the dash switch, next time none, and then maybe just the 2wd light. Changed the dash switch (with auto button), change actuator and actuator switch and hoses to actuator. Don't know if it is tccm. Does anyone know if the tccm switch is suppose to make a clicking sound when vehicle first starts? Mine does. Is there anyway to test the tccm switch? Any help is appreciated.
  • i have a 96 jimmy, when you push the 4hi or 4lo the transfer case will lock in, but the front wheels will not pull. the vac. thing under the batt. always pulls on the cable even in 2hi it never release unless you pull off the vac hose. i have tried to pull more on the cable but it seems to be as far as it goes. im lost on this one this is the first 4wd i have had like this one. plz help thax
  • My Gmc Jimmy keeps cutting off on me, I can be crusing on the hwy, road and it will just shut down. I will let it sit apprx 30 sec - 1 min and it will start back just fine, but will cut off on me again, seems like when I press on the gas pedal it acts as if the gas is not getting to where it needs to go (when the truck cuts off the signal I get is the battery light comes on) it did this also before I bought a new battery. I have a also replaced the fuel filters and the multi fuel port injectors. Can someone please advise this woman on her vehicle before I spend another dime on it.
  • I recently had transmission replaced and now my 4 wheel drive won't engage. There is a hose hanging down from above tranny I cant see where it goes any help or info on where I can get a diagram that would be helpfull or if anyone has any ideas where it would go like the transmission

    Thanks Joe
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