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Discussion Starter · #1 ·
Hello all! I drive or drove until a few days ago a 2002 Chevy Trailblazer. It seems that I have broken my intermediate shaft (the one that runs through the oil pan). I called looking for the part, only to find out that it is a dealer only part and cost around $600. As a recently laid off teacher this is a bit steep. Just wondering if there is an aftermarket one out there, or if someone knows where I could find one cheaper?
 

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There would be no aftermarket vendor of something so obscure and bulletproof. But it's VERY odd that this broke and nothing else? Are you an automotive tech teacher? If not, this is not an easy fix.

Who said the shaft was busted, anyway? And did you confirm that? A MUCH, MUCH more common failure is the splined disconnect (assembly #56 in the drawing) which is greased only at the factory and sometimes they dry up and break. Run a search - you will find threads about a mechanic who fixes these regularly.

See the drawing for the location of item 15, GM #12479125 (list $280, www.parts4chevys.com $184):

 

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Discussion Starter · #3 ·
Thanks

Thanks so much for the info. I am a seventh grade teacher, but my husband is a ford mechanic. I am not sure he knows what is going on. I guess I should just take it in. Thanks so much for the info.
 

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If your going "by guess, or by god", maybe describing the problem might let us help ya.

It is possible, that the 2wd disconnect coupling, which is at the outer end of the intermediate shaft, may be broken.
 

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Discussion Starter · #5 ·
To be honest with you, this is all I know... The front end makes a noise that to me sounded like metal dragging on concrete. My husband pulled the front passanger side wheel off he found what we were told was the intermediate shaft to be busted. He showed me the casing and how it moves very loosely??? That's about all I know. When he spoke to a mechanic friend that works for a chevy dealer, he said it was the intermediate shaft, but other that that only my husband has looked at it, and he was not sure how to identify the part other than saying it runs through the oil pan... but he does have the mechanical knowledge to fix it, if that is whats wrong. I just need to know if it really is the intermediate shaft.... Thanks again all!
 

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Discussion Starter · #7 ·
Hope this will help

It is the bearing casing connected to the oil pan on the right side of the motor. I believe my husband said it was #1, 2, and 3 in group 56 for the diagram. There is about 2 and a half to 3in. of slop in that bearing housing. Any ideas???? About how much are the parts and ehat are they called... I toolk a picture of the issue but it won't upload. Sorry

Thanks again!:crazy:
 

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2006 chevy trailblazer_ss_3ss
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I recently had an issue with my SS All-Wheel-Drive @ 62k miles. While I don't have a decoupling spline in the bearing housing, I think the issue is the same. The primary failure mode was lack of spline lubrication. I've attached some images of the failure.

I'm shocked that GM decided to use grease to try to lubricate involute, high speed, working splines. Splines used in this type of application need an oil bath...not grease. Grease is for low speed splines or non-working splines. I've never seen grease successfully used on high speed working splines. The closest application to this is the slip yoke found in some drive axles...and those are typically square tooth splines with a special plastic wear coating.

The pictures below show the bearing assembly damage, a closeup of the lack of intermediate shaft engagement, the intermediate shaft spline damage, and the lack of lubricant on the cv drive axle splines. Hopefully, I'll have a permanent fix in a few weeks...I don't want to pull this apart to grease it every year.

When I'm done...I'll post the results.

When you get the new parts, you will want to take some additional maintenance actions to keep it together. Your component degridation won't be as fast as my SS because you are all-wheel-drive all the time...but it will happen again.
 

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Discussion Starter · #11 ·
Still unsure!!!

I really don't have the cash to take my trailblazer to get it fixed. My husband can fix it but I am unsure what parts to order. I have a picture of the issue (still intact) any ideas??? I believe it it #1,2,and 3 on the diagram above but when I was looking on the parts list it gave me 2 different # 3's, which confused me... I will try to attach the picture, but if i can't I am not sure what else to do?? None the less. Thanks for everyones help...
 

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Sorry I was on the road and missed your last question. NP4 is an RPO code for various build options. There is a chart of all RPO codes under the site's "Resources" pull down menu.

NP4 is AWD. You have 4WD, not AWD.

So buy the one for non-NP4.

You can also tell right away since you have the front axle actuator #19, which bolts to your version of the part. The NP4 version does not have this feature.
 

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Hate to hijack the thread but can you give me the name of part number 8 in group 56 of this diagram? I've searched everywhere and can't find it.
 
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