Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Chevrolet Blazer GMC Jimmy Transmission Problems



  • heavnlycareheavnlycare Posts: 1
    edited March 2010
    My Blazer shifts all the time. It shift wrong it will shift up instead of down and visa versa. Also the blinker sound (not the light) blinks when Im not pushing the break. Would all that me connected to the main computer or wires or all seperate problems. PLEASE HELP i'm sick and tired of haveing issues with this truck
  • I have a 1997 Blazer and for the most part it runs strong. I have 132,000 miles on it. I had a problem with the transmission shifting very hard out of 1st gear after I would drive for about a half hour, or when ever the check engine light would come on. This problem occurred with in weeks after buying the vehicle. I drove it this way for about a year and a half. I changed the transmission and with in 10 minutes of putting the new transmission in, I was already experiencing the same problem. My mechanic says its a bad transmission. Could this be an electrical problem? My ignition switch has a tendency to stick and sometimes and probably should be replaced, I cant get the key out of the ignition for weeks. Could this have anything to do with the transmission problem??
  • I'm having the same problem a few of you have discussed here. I have a 96 Blazer 4wd and when I got it at auction and drove it home it shifted OK albeit a little hard from 1st to 2nd. When the vehicle reached operating temperature though, the check engine light came on and it wouldn't downshift to first or shift into overdrive. It would start out in 3rd unless I manually downshifted, and even then it would only downshift to 2nd. I un-hooked the battery for 15 min or so, hooked it back up and the problem went away a few minutes only to trip the check engine light again, and shift goofy again. I have seen replies of "change the fluid and filter" a lot and have yet to do it. I guess what I'm asking is if anyone that has had this exact problem (I've read several instances of it here) changed the fluid and it fix the problem? I know its one of those things to narrow it down, but I want to know if changing the fluid with this particular problem has ever fixed it instead of only ruling it out as a possible cause. So.. that said, what should I do, I am mechanically inclined, I was a certified mechanic at one time (not in transmissions though) and have a few tools. Any help you can provide would be greatly appreciated!! Thanks!
  • gkitegkite Posts: 11
    I have a 96 GMC jimmy, which had the same problem. A friend of mine which worked at a chevrolet dealer did some research and and said that we needed tio replace the wire harness going to transmision. We did and I have not had a problem with it going on 5 years now. the wire harness develops some kind of voltage drop and keeps it from down shifting
  • Was your problem exactly like mine? I want to be sure before I take drastic steps in what could be the wrong direction. I only ask because others have stated they have the EXACT same problem I do.. I just want to be certain.
  • gkitegkite Posts: 11
    I'm pretty sure it is. My check engine light came on and when ever i came to a stop and restated it would start out in like second or third gear, would not down shift to first. also there was no passing gear. At that time i took it in and had the transmission rebuilt. on the way home from picking it up it did the same thing .check engine light back on and no first gear. $1200.00 dollars down the drain. All I can say is when we replaced the wire harnes and pigtail going to transmision my problem went away and has not been back since.
  • tonyb6tonyb6 Posts: 1
    I have a 1995 jimmy , I can put it in drive or overdrive and try to pull out but it is a real strain on it , but if I Put it down in 1st or 2nd and pull out it does fine , then I can put it in drive, then it wont shift in overdrive , I changed the shift silniod but it didnt work , someone help ! Thanks !
  • memebearmemebear Posts: 1
    edited April 2010
    My Blazer won't shift out of 2nd and acts like it's in neutral when it hits 25mph. Has reverse and the fluid, filter and pan was all just changed and clean. Was running fine till a few days ago. Can someone please help me. I love my truck and don't want to get rid of it. :(
  • cmed06cmed06 Posts: 1
    Bought my jimmy 6 years ago from orignial buyer. Good shape, well cared for. Few issues - alternator, a/c. For last year it's had several engine codes dealing with transmission. Taken it to 2 different tranny shops and neither could figure out problem. All codes hint at electrical problems. Could this be a computer issue? Any help would be appreciated.
  • boygoneboygone Posts: 1
    When i start my jimmy after it has been sitting for a couple hours it delays when i put it in drive or reverse, can anyone help, what could this be?

  • Hi ddeal.... I have recently ran into the same issue you described in the above post a few years back. Did you ever figure out what was causing that issue?
    I recall having greased the ball joints in the past and that seemed to rid this symptom for a while.
  • skstn34skstn34 Posts: 3
    Thanks for reminding me to post!!

    Okay, it was the transmission GOING OUT, the dealership, or whomever, doctered up the tranny with motor oil !! I replaced the entire tranny.

    My advice to any Blazer owner reading this, as soon as your Check Engine Light comes on, drop by an Auto Zone, they'll check the code for free. Mine couldn't take steep inclines on the interstate without triggering my light, plus the rpms jumped up and never would jump back down, until I shut the truck off and restarted.

    I would have never known if I only used my truck locally, but towing a decent load, and blowing fluid out the back is a BIG sign something's up!

    Hope this helps someone!
  • carkeycarkey Posts: 2
    My Blazer has just started to have some problems with the transmission not wanting to go back into neutral and start in first gear. When I slow down into a stopped position, and then get ready to apply the accelerator, the Blazer seems to be in second instead of first gear from a complete stopped position. I have topped off the transmission fluid. What do you think could be the problem?

    From the Blazer being in a stopped position and then I apply the accelerator to start moving, the Blazer acts like it is starting in second instead of first... What should I do? I have topped off the transmission fluid. What should I do next?
  • carkeycarkey Posts: 2
    Hey there fellas,

    My Blazer's driver side door has started to sag. I have looked at the door hinge and it looks like the top hinge on the door has sprung it's spring and the metal bushing has broken in half and is not there within the hinge pin area. How easy is it to get one of these hinge pin replacements and put it in yourself? What do you use and how long should it take and what tools do you use?

    Thanks fellas! Charley McGilicutty
  • jlflemmonsjlflemmons Posts: 2,240
    This is a very common failure in the S10 series. The pin and bushing sets are available at most autoparts stores. One tool you might want to buy/borrow is the door spring compression tool. It makes the job much easier and safer.

    Good luck
  • craigmc74craigmc74 Posts: 2
    I have the same problem with my 2000 Jimmy. What was the resolution to your problem? I've got less than 50,000 miles on a $2500 tranny rebuild and I'm debating whether or not to get rid of this truck. If I can fix it myself with a replacement part like a relay, sensor or solenoid, no problem. If not, I'll start fresh with a new truck (I'll pull the motor, of course, because it is badass).
  • CaptnTonyCaptnTony Posts: 3
    @craigmc74: My surging was fixed by doing a transmission flush with new filter and refill. Mine happened at about 1200 -1220 rpm if I recall correctly (might have been hiway speed so 1500-1520, it's been that long w/o it happening :) ). What ever it was, it could be reproduced and it happened to be right at the rpm for the truck (2002 blazer) going 30mph - the local speed limit, so it constantly happened to me.

    I checked levels on the stick and it always looked good. I finally had to try this as a last resort and it worked perfectly.

    Hope that helps.
  • ramdodge1ramdodge1 Posts: 3
    Sorry, I wish I could help you out, I got rid of my Jimmy and baught a new car...good luck!
  • alj3jalj3j Posts: 2
    I have a 2001 4 X 4 jimmy 4.3 auto. 125k with 30k scince trans rebuild. Shifts fine and no slip in 1st, 2nd and 3rd. When overdrive kicks in, will chatter under a little accelration. Almost seems like low on fluid ( it's not) as it pulls good for 2 seconds, then chatters (tach goes up 2-3k) for 2 sec. then pulls good for 2 sec, etc. Any help/ideas? Thanx, Al
  • rideusrideus Posts: 4
    Truck as 115,000 and has pulled a 5x8 trailer with band equipment for the past 6 years on weekends only. Seemed like it was shifting hard from 1st to 2nd but thought it was in my head.

    Just last night, it started making a very loud winding sound (like a loud drill) while driving in overdrive and then it would quite. Like it was engaging and then disengaging or something. When I got home, it had no reverse. I could drive forward but it would get up to 3000 rpms before shifting to 2nd.

    Got it to a very well respected tranny shop. Had work on a Dodge done there before and they've been around here for 40+ years.

    Seems I need to be aware that it could be an electronic/computer issue and not just a mechanical transmission issue? As someone said, anyone will probably want to rebuild a tranny with that many miles on it that has been pulling a trailer.

    Should I take it to a dealer to better diagnose the electrical aspect of it? Seems most tranny shops are more "gear oriented" than electrical/computer oriented.

    Great forum and posts. All very helpful.

Sign In or Register to comment.