Clunking noise in front end when going over bumps

[JClishe]

When driving over bumps, I hear some sort of clunking noise in the front end. At first it only happened on the passenger side, then over time the driver side started making the same noise.

I can't quite pinpoint where it's coming from, but it sounds like it's somewhere under the cab, possibly in the area of where the torsion bars connect to the cross member, but I could be wrong.

I'm still on the original balls joints; could that be causing it?

[Smitty00Z71]

It could be anything, especially if you have an older truck with high miles. I would crawl under the truck and see if anything appears to be loose, pull of the torson bars,  etc. Also tighen any bolts and screws.

[Jpshostr]

It is the torsion bars that are causing that noise.  There is a little block right in the crossmember where they attach that broke on my Blazer, giving the same noise.  That would be the first place to look.

[The Beav]

So that's what causes that noise?  I just got rid of a '94 S-10 Blazer that had that 'thunk' but nobody could ever find the source.  Generally happened when unweighting, like at the end of a whoop-de-do.  No big loss, the thunk was the least of its problems when I got rid of it!

[y2kz71]

I didn't think 1990 K1500 4WD's had torsion bar IFS suspensions, I thought they had a conventional 4WD setup????????????????????

[Frank S]

I'm pretty sure that GM changed over to IFS in '88 when they changed to the last generation body style.

In that case,a 1990 would have torsion bars.

[DuckhunterInTN]

The only thing that GM had that was not IFS in 1990 was the suburbans, blazers and duallies.  The K1500's were IFS.