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Chevy Blazer GMC Jimmy Maintenance and Repair

3451 messages,  Last post on Dec 05, 2009 at 8:12 PM

You are in the Chevrolet Blazer Forum. Your Hosts are steve_ & tidester

What is this discussion about? Chevrolet Blazer, GMC Jimmy, SUV


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#3407 of 3451
'95 jimmy speedo works on and off by house419
Sep 13, 2009 (6:45 am)
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The speedometer was working one day and then just quit and is now working again... Any ideas?
#3408 of 3451
Re: '95 jimmy speedo works on and off [house419] by skiextreme2
Sep 13, 2009 (5:55 pm)
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Replying to: house419 (Sep 13, 2009 6:45 am)

If you have an old school speedo (mechanical), it's possible the gear where the cable meets the transmission is wasted. I had that happen on a Chevy van I had after I had the transmission rebuilt.
 
If you haven't done or had any work done that required pulling the cable or gear, check and see if all the connections are tight.
#3409 of 3451
Re: pitman arm replacement [Mr_Shiftright] by johnss10
Sep 14, 2009 (11:44 am)
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Replying to: Mr_Shiftright (Sep 11, 2009 9:24 pm)

No, the engine does not need to be moved/lifted. I removed the steering linkage (center link), then removed the steering box from the car. Much easier.
#3410 of 3451
Re: pitman arm replacement [johnss10] by Mr_Shiftright HOST
Sep 14, 2009 (12:52 pm)
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Replying to: johnss10 (Sep 14, 2009 11:44 am)

that's what I said too. You lift the car, not the engine.
#3411 of 3451
Re: '95 jimmy speedo works on and off [house419] by johnss10
Sep 14, 2009 (1:03 pm)
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Replying to: house419 (Sep 13, 2009 6:45 am)

My '95 S-10 pickup has a mechanical speedo, so your Jimmy probably does also.
 
Since this is an intermittent problem, it's most likely a broken cable. It could be the gear on the transmission, or the speedo itself.
 
I would take it to a speedo shop, there work is usually pretty reasonable for what they do.
#3412 of 3451
65 mph Vibration by jimmyhater
Sep 27, 2009 (4:57 pm)
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I have a 96 GMC Jimmy 4x4 that vibrates at speeds above 65 mph, most noticeable when traveling uphill. I have looked at multiple posts on the internet regarding vehicle vibration at speeds above 64-66 mph, and couldn't find a good solution. So far, I have replace the wheel hub assemblies, front half-shafts, rotors, drums, tires (even had them road forced balanced), and driveline u-joints. The only thing left to replace is the front differential and the rear differential bearings. I did notice that I have a bad mody mount on the front right of the vehicle. Could this really cause this vibration? The vehicle vibrates the most at the door hinges and mirrors. I did notice that there might be excessive play in the driver-side differential driveshaft flange. Any ideas out there before I try replacing something else? I was thinking about taking the front cv shafts apart and only placing the part that help keeps the wheel hub assemblies together...I don't need 4x4 that bad. Thanks.
#3413 of 3451
Re: 65 mph Vibration [jimmyhater] by jlflemmons
Sep 27, 2009 (5:31 pm)
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Replying to: jimmyhater (Sep 27, 2009 4:57 pm)

Check motor and transmission mounts, too. The tranny mount is easy, but the motor mounts are a bit harder. Easiest to come in through the wheel wells and underneath.
 
Motor mount breakage is fairly common on these. That 4.3L can generate some pretty good torque. I have had to replace both on my two Blazers this year.
#3414 of 3451
Re: 65 mph Vibration [jlflemmons] by jimmyhater
Sep 27, 2009 (7:26 pm)
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Replying to: jlflemmons (Sep 27, 2009 5:31 pm)

What symptoms did your vehicle experience with the bad mounts? I checked the transmission mount before and it seems fine. The engine mounts were somewhat difficult to get get a good look at. The engine doesn't excessively move when putting it in gear and reving the engine. If anyone may think it may be tie rods (inner and outter), control arm bushings, or the idler arm...it isn't...replaced those too. And, of course the front-end alignment didn't help. Actually, I had two places check the alignment. One place with a laser-alignment system said my caster setting was a little out of whack. The place that did my alignment said the caster setting was fine. The vehicle was backed into at a low speed a few years back...I'm wondering if it caused the pinion angle to change. Say, when I drive up-hill, more weight on the rear causes the pinion angle to change slightly more, thereby causing the vibration???
#3415 of 3451
Re: 65 mph Vibration [jimmyhater] by jlflemmons
Sep 28, 2009 (5:33 am)
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Replying to: jimmyhater (Sep 27, 2009 7:26 pm)

I was thinking more along the line of the increase in torque needed when going up hill. It would take more than a little bump to knock the rear end out of alignment, and a good alignment shop would see this. You would also be getting some unusual tire wear. Any chance the drive shaft has thrown a weight, or been damaged?
#3416 of 3451
Re: 65 mph Vibration [jlflemmons] by jimmyhater
Sep 28, 2009 (6:58 am)
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Replying to: jlflemmons (Sep 28, 2009 5:33 am)

When I changed the u-joints, I didn't notice any dents or lost weights. The shaft was a little rusty, so I probably wouldn't know if it lost any weights. Does your Blazer have 4x4? If so, have you noticed play on the short shaft that comes out of the driver's side of the differential? It's normal for the shaft to move in/out of the differential a little bit, but I'm not certain about how much play is normal moving it up and down.

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