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Can't find "clunk" - K2500 Group: alt.autos.4x4.chevy-trucks Date: Thu, Oct 9, 2003, 1:17pm (CDT+1) From: somethingorotherdotcom (Snowman)
(vehical) '95 K2500HD EC/LB 6.5 TD/4L80E
(symptom) I've got this low, dense clunk that I hear daily after driving over about 50-55 mph for a mile or longer while coming up to a stop sign. I usually coast a little while, then start to hit the brakes and at about
20-30 mph upon the deceleration, I hear it one time only from the front end, "clunk."
(visualization) This resembles a heavy cast part hitting another very heavy part, but I can't duplicate it unless I am driving on the road.
(diagnostic steps taken) I've tried jacking it in the air in the garage and bouncing a 4x4 under the tires to try to simulate a vibration, tried listening with the window down, etc., but to no avail.
(further diagnostic input) I feel it up through the floorboards, it's so intense.
(insight into customers state of mind) I can find no evidence of anything wrong, though, other than the noise and I'm just afraid it's going to break something some day and I'm going to have a real mess on my hands.
(brief maintenance history) I've had both spindles detached from the upper ball joints for pulling both front half-shafts and have replaced the pitman arm back in March. I've put 6,000 miles on like this and it doesn't seem to get better or worse. any suggestions on something I can check?
(admittal of confusion) Pretty vague, I know, but I'm scratching my head on this.
(random thoughts) I thought about posting it here a while back, but it's almost impossible to describe something like this. Only happens in the above scenario. thanks in advance,
Snowman //////////////////////////// Snow, you have to have the "sprung weight" off the suspension to check the ball joints....... meaning you need to lift the wheel under the controll arm, in order to take tension off the ball joints to see if they have any play in them.
Spring tension will keep you from finding even a very worn ball joint.
However..............
are you sure it's coming from the front ?
The reason I ask, is because you stated you can feel it in the floarboard.
have you noticed any shifting problems...... maybe a little more solid on the shift points than it use to be???
If you're feeling it in the floorboard, and it's pronounced, before I went digging into the front end I would take a look at .......
tranny mount
drive shaft slip yoke (looseness=pack it slap-ass full of grease)
u-joints
drive shaft center support bearing (aka...carrier bearing, hanger bearing)
transmission (downshift clunk)
It very likely could be a frontend part going on you.....but if you're getting it through the floor board, I would take a quick gander in that area first.
jmo
respectfully to the.....snowman
marsh monster .