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2002 chevy trailblazer_ls
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Discussion Starter #1
I have a 2002 4wd trailblazer with very low milage and I'm the original owner. I get no engine warning lights but this problem originally occurred while attempting to back-up in 4lo. I had no choice. I had parked it in 4lo due to the fact that we got blasted with snow and to get into my spot I had to have it in 4lo. Previous to this, I drove around the parking lots to make sure that 4hi and 4lo worked. I shifted to 4lo by-the-book then went and parked. Next morning as I tryed to back out my truck began to crow-hop and bind which freaked me out. Sat there and turned the switch to 4hi while in neutral-no luck, then awd-no luck.
I had no choice but to back up enough that I could drive it forward over a median and out of the parking spot. I could go forward just fine, tryed 4hi,awd,and 2hi. It backed up just fine in 2hi so I left it there and drove maybe 350 miles and on one torrential rainstorm with puddling on the highway I switched from 2hi to awd without issue. When the storm abated I switched back to 2hi, drove maybe 10 miles home, parked it in 2hi and now the crow-hop and binding has returned while trying to back out right after I start it up. I immediately stopped at the first sign and it has been parked for a few days as I systematically try to diagnose it following several guidlines on here.
Mind you, I am not a mechanic but if I read and watch a video on how to replace a part I can do it, laying on my back on a driveway, truck on jacks with 2 feet of clearance above me.
I get no warning lights. I have dropped all of the fluids which only have 22,000 miles on them. All were fine. The tranny fluid was still red but it smelled a little hot.The transfer case switch works. There were no metal shavings when I dropped any of the fluids.
I did the self-check from please read me before making a post.The listed issue which I have is that the front left wheel turns as does the front drive-shaft. Step 3 seems to me to have a conflicting issue as to whether or not it is a front axle disconnector an internal transfer case failure. Could anything this radical have happened as a result of parking my truck in 4lo? Seems to me that there could be something much simpler and less invasive which has failed but for the life of me I don't know how to repair it, the logical order to begin a systematic check, or where to look. I have a chiltons manual which is pretty much useless. I mean, this issue came out of nowhere.
Aren't there steps in between, simpler ones, which I can perform first? And if I need to check whether or not a part is getting an electric signal, how do I do that?
Long post but I'm really stuck here.
Thanks.
Bikerider
 

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2004 gmc envoy_sle_xl
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1,239 Posts
Some questions;

1) have you changed the transfer case fluid (even though you have low mileage)?

2) is the Service 4WD light on in the dash?

3) do the 4WD selector switch lights work correctly (short period of flashing then solid when switching modes)?

If there is no Service 4WD light on and the switch lights are behaving correctly, I can only assume the problem is most likely at the front disconnect. This area is not well lubricated and can become bound up.

I suggest posting your problem at G M T N a t i o n . c o m / f o r u m s (no spaces), most of the experts from here went there.
 

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2002 chevy trailblazer_ls
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7 Posts
Discussion Starter #3
crow-hop, binding feels as it were directly beneath me

Some questions;

1) have you changed the transfer case fluid (even though you have low mileage)?

2) is the Service 4WD light on in the dash?

3) do the 4WD selector switch lights work correctly (short period of flashing then solid when switching modes)?

If there is no Service 4WD light on and the switch lights are behaving correctly, I can only assume the problem is most likely at the front disconnect. This area is not well lubricated and can become bound up.

I suggest posting your problem at G M T N a t i o n . c o m / f o r u m s (no spaces), most of the experts from here went there.
Thank-you for the quick response.
The answer is yes to all of your questions: changed the fluid in tranny, front and rear differentials, and also the transfer case.

The lack of a service light and the fact that the 4wd selector switch works and from doing the suggested tccm test and having my truck pass is part of what baffles me.

The crow-hop and binding happens the next day after having parked it the previous evening. When I start the truck and try to back up, I've had the issue happen 3 times-intermittently-even in 2hi.

The binding/crunching sounds and feels as it were beneath me or very close to beneath me. That coupled with the crow-hop feels that I could be causing major damage. I haven't tried backing out for 5 days now.

Thank-you for the advice. I will give it a go.
 
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