Have you had a bad intermediate steering shaft? What are the symptoms?

**suitercrew** · 11-24-2017

Hey guys ive been trying to chase this clunking noise for a long time now and still haven't found it but here is what I know. Literally my whole suspension is all new. My rack and pinion is leaking like a faucet and has been run partially dry in sure multiple times. My tie rod ends ive never changed either although they seem fine. The problem I have Is when I turn the wheel a certain direction I keep getting this clunking\popping noise and it can be at random points in the steering it doesnt have to be full lock or anything like that. After showing my dad he thinks its just the rack which we are replacing next week but, I did a lot of reading and it sounds like it could be the iss. I don't want to do twice the work by replacing the rack and then having to go back and change this part that connects to the rack later if it is in fact bad. So what do you guys think?

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**Gregorius** · 11-24-2017

Oh boy. I remember this from somewhere. Grease the Int shaft. It's been awhile, but this was a fairly common problem. IIRC it's 2 Uni joints and a star profile slip-shaft? The grease gets hardened, and lets the sliding shaft bind up, then unloads in a clunk. I got to it from inside the car and just squirted wd40 to loosen it up for a test. Something.

**Fivefingerdeathpunch** · 11-24-2017

Did it on our old bonneville, remove the whole shaft and took the two pieces apart. Cleaned it and slammed it full of new grease, stayed quite for 3-4 years easy and still made no noise when we sold it.

**suitercrew** · 11-24-2017

So basically what I'm understanding from doing research and from what you say five finger. The shaft doesn't normally fail in the sense that it break it just loses its grease? So when I got to replace the rack and in already down there it would be a good idea to slab a sh*t ton if grease in there right? What grease would work best for that? Lithium?

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**CHI2000GTP** · 11-24-2017

Spraying WD-40 in there, or any spray lube for that matter, is a fix. But a very temporary fix. Here is a good link to doing it the permanent way. Something I'm considering doing myself.

http://www.colinkraft.com/shaft.php

**suitercrew** · 11-24-2017

Originally Posted by CHI2000GTP

Spraying WD-40 in there, or any spray lube for that matter, is a fix. But a very temporary fix. Here is a good link to doing it the permanent way. Something I'm considering doing myself.

http://www.colinkraft.com/shaft.php

So do you also get the same clunk I'm talking about? Its just weird cause sometimes it's really loud and that's why originally I thought it was an axle or something big.

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**CHI2000GTP** · 11-24-2017

No. I'm not getting that clunk myself. I have been doing a lot of preemptive maintenance though. That's all. So was considering doing it. That link gave me a good idea of what it took.

Another guy on here had a clunk noise he was chasing down and it ended up being the rear-most subframe bushings. That thread is called: THE CLUNK IS OVER. Might be worth checking out.

**wstefan20** · 11-24-2017

There's an actual service bulletin and official kit that worked like a charm for me. I'll post the link later. It actually has a plug to keep the grease in.

**suitercrew** · 11-24-2017

Originally Posted by CHI2000GTP

No. I'm not getting that clunk myself. I have been doing a lot of preemptive maintenance though. That's all. So was considering doing it. That link gave me a good idea of what it took.

Another guy on here had a clunk noise he was chasing down and it ended up being the rear-most subframe bushings. That thread is called: THE CLUNK IS OVER. Might be worth checking out.

Ill check it out. Thanks man

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**Swiggles** · 11-26-2017

Originally Posted by wstefan20

There's an actual service bulletin and official kit that worked like a charm for me. I'll post the link later. It actually has a plug to keep the grease in.

I have the clunk in the impala, it drives me nuts! I have the entire power steering system parts that I’ll be replacing soon and I got the official delco kit for the iss from rockauto. And I hope it fixes it.

**EJOUIE** · 11-27-2017

Replacing the ISS with an updated design is what GM finally settled on as their solution.

Re greasing was one of the in between fixes.

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**rickisrad** · 11-27-2017

You can usually tell if the ISS is the cause by moving the steering wheel back and forth while the car is off and feeling the ISS at the same time for the clunk.

The dorman ISS has worked fine as a replacement for me in multiple vehicles.

**CHI2000GTP** · 11-27-2017

I heard from a member on here to go with thegenuine GM version of the ISS. Not the Dorman. Lol... We all have decisions to make I guess. That recommendation came fromHighOctaneRacing in this post link below.

http://www.grandprixforums.net/threads/103740-Luke-s-GTP?p=1481967&viewfull=1#post1481967

**rickisrad** · 11-27-2017

I guess everyone has their experiences. I've replaced 3 of my own with Dorman and many others in shop with no issues.

**Swiggles** · 11-27-2017

http://impalahq.naioa.com/HowTo/Iss.html

**stealthee** · 11-27-2017

Originally Posted by CHI2000GTP

I heard from a member on here to go with thegenuine GM version of the ISS. Not the Dorman. Lol... We all have decisions to make I guess. That recommendation came fromHighOctaneRacing in this post link below.

http://www.grandprixforums.net/threads/103740-Luke-s-GTP?p=1481967&viewfull=1#post1481967

Early Dorman's had a factory defect. They corrected it somewhere along the line and they have been fine ever since.

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