clunk/rattle in drivetrain

[boborc]

the other day i hit the brakes really hard.then there was a clunking noise that sounds like a loose rear wheel but its not.its a 4wd s-10 2001 with 48k & rear disk.the brakes are well worn so i will replace them though i never heard a noise like that could it be a wheel bearing,the universals seem tight & there is almost an 1/8 turn play in the rear/tran which is almost the same as my brothers truck but his as 8k on it.any suggestions i am baffled thanks for the help it is random on/off at different speeds under accel & under braking though i seem to get a bigger clunk when the brake first gets applied

[movin2stereo]

Mine did this the other day(while it was still mobile)when the brakes were applied.I just thought it was the brake grabbing?My driveshaft also has play in it like you mentioned.

[BlazerLT]

There should be no play in your driveline.

The clunking could have been many things.

Does it happen all the time or just that once?

[boborc]

its happens intermediatly its an on/off problem but it is steadily getting worse.sounds like there is 2 pieces of metal in the tire just bouncing around then it will go away for a mile or so then its back.i just can't figure it out.i am doing brakes ,rotors for sure & calipers if need be today i'll let you know

[BlazerLT]

Originally Posted by boborc

its happens intermediatly its an on/off problem but it is steadily getting worse.sounds like there is 2 pieces of metal in the tire just bouncing around then it will go away for a mile or so then its back.i just can't figure it out.i am doing brakes ,rotors for sure & calipers if need be today i'll let you know

Check your rear brakes for rotor scoring and lack of pad depth.

Also, the noise can be a cat convertor rattling, a sign a replacement is needed.

Also, the U-joints could be shot.

Does the truck rumble a bit at higher speeds and can you feel a vibration in the gas pedal?

[boborc]

no vibration in pedals it sounds like a pair of jeans in the dryer with a belt buckle on the but it happens randomly at different speeds.i replaces the rear brakes & rotor the emergency brake set-up scares me it is loose & flimsy in there its only held in place by one clip.it seemed to quiet down a little after i did the brakes.but came back when she slammed them on again today.its makes noise for a mile then it stops for a mile can't fiqure it out

[BlazerLT]

Aha!

You are going through what I just replaced.

Rear U-joint was shot and sounded just liek that.

The rear joint was dry and friggin shitty as hell, when he showed it to me I also dropped my jaw on the floor.

It was just THAT bad.

[boborc]

update!! guys n gals the kluck/grinding noise wich it became was the front rt wheel bearing i replaced the rear first, that was't it .then i let a mechanic drive it he said the noise travels in 4wd models & its hard to tell where its coming from so today i changed the one & that was it thanks for your help everybody

[BlazerLT]

Originally Posted by boborc

update!! guys n gals the kluck/grinding noise wich it became was the front rt wheel bearing i replaced the rear first, that was't it .then i let a mechanic drive it he said the noise travels in 4wd models & its hard to tell where its coming from so today i changed the one & that was it thanks for your help everybody

You said the noise was coming from the back though?

[vtmecheng]

Good to know and something to keep in the back of my mind for noises. BTW. you will have about 1/8 a turn of slop in the drivetrain from the wheels to the trany. Think about all the gears you are going through to get there with a 4x4 and each one will have a small amount of slop. That adds up.

[boborc]

it sounded like the back.the guy said its decieving with 4wd, it travels through the drive train causing a surround sound effect.believe me do you think i would have laid in a puddle for 5 hrs changing rear bearings if i knew it was the front.ITs that decieving

[kidglockman]

Originally Posted by boborc

the other day i hit the brakes really hard.then there was a clunking noise that sounds like a loose rear wheel but its not.its a 4wd s-10 2001 with 48k & rear disk.the brakes are well worn so i will replace them though i never heard a noise like that could it be a wheel bearing,the universals seem tight & there is almost an 1/8 turn play in the rear/tran which is almost the same as my brothers truck but his as 8k on it.any suggestions i am baffled thanks for the help it is random on/off at different speeds under accel & under braking though i seem to get a bigger clunk when the brake first gets applied

I'm having the same problem on my 1990 have you figured it out ?

[rlith]

When you hear that clunk from the rear and you know your rear and tranny are ok, it typically denotes AXEL-WRAP. What happenes is that your rear springs twist and then untwist do do force... Only real solution is to put in new springs and a swaybar

[kidglockman]

Originally Posted by boborc

update!! guys n gals the kluck/grinding noise wich it became was the front rt wheel bearing i replaced the rear first, that was't it .then i let a mechanic drive it he said the noise travels in 4wd models & its hard to tell where its coming from so today i changed the one & that was it thanks for your help everybody

so where was the problem?

[BlazerLT]

Originally Posted by kidglockman

so where was the problem?

Did you read his post?