Heard a clunk and then
#2994789
12/12/21 10:43 PM
12/12/21 10:43 PM
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Joined: Jan 2003
Posts: 3,623 Millinocket, Maine
JonC
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OP
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Joined: Jan 2003
Posts: 3,623
Millinocket, Maine
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I was driving along about 30 MPH, just a steady speed and all of a sudden a big clunk and shake like I ran over something or like something hard broke. I looked in rear view mirror, nothing. I then started easily to get back up to speed and clunk, clunk, clunk. I let off the gas and it goes away. I'm only about a mile from home so I ease it slowly all the time under slight acceleration I get a clunk, clunk, clunk. I stop at stop sign and then proceed and still get the clunk. I go down hill coasting and no noise unless I give it just a little gas. Pop it into neutral and rev engine, everything seems ok. I get it home, put it on lift and everything looks ok, u joints, drivshaft etc. What do you think? Cuda 340,904, 741 differential with 3:55. TIA
11B40
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Re: Heard a clunk and then
[Re: JonC]
#2994802
12/12/21 11:20 PM
12/12/21 11:20 PM
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Joined: Jan 2003
Posts: 18,423 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
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I Live Here
Joined: Jan 2003
Posts: 18,423
UPPER MICHIGAN, MARQUETTE COUN...
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I was driving along about 30 MPH, just a steady speed and all of a sudden a big clunk and shake like I ran over something or like something hard broke. I looked in rear view mirror, nothing. I then started easily to get back up to speed and clunk, clunk, clunk. I let off the gas and it goes away. I'm only about a mile from home so I ease it slowly all the time under slight acceleration I get a clunk, clunk, clunk. I stop at stop sign and then proceed and still get the clunk. I go down hill coasting and no noise unless I give it just a little gas. Pop it into neutral and rev engine, everything seems ok. I get it home, put it on lift and everything looks ok, u joints, drivshaft etc. What do you think? Cuda 340,904, 741 differential with 3:55. TIA [censored]. To me it sounds like a disaster. Have it hauled to the nearest toxic waste site. My bets are pull the shaft you lost a cap.
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Re: Heard a clunk and then
[Re: JonC]
#2994842
12/13/21 07:49 AM
12/13/21 07:49 AM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Well the noise has to be coming from some section of the vehicle, front, center, rear, left, right, center. Should tell you where you need to look.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Heard a clunk and then
[Re: Ramrod39]
#2994844
12/13/21 07:55 AM
12/13/21 07:55 AM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,228
Colleyville
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I'd guess it is in the differential. My guess, spider gears and mebbe axles. DAMHIK
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Heard a clunk and then
[Re: 3hundred]
#2994848
12/13/21 08:49 AM
12/13/21 08:49 AM
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Joined: Mar 2006
Posts: 9,843 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,843
MI, usa
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8 3/4 w/o sure grip? Or a cone style sure grip? If so my bet is the spider gear shaft has wobbled out the hole in the case. Doug
Last edited by dvw; 12/13/21 08:50 AM.
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Re: Heard a clunk and then
[Re: NITROUSN]
#2994867
12/13/21 10:24 AM
12/13/21 10:24 AM
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Joined: Jan 2003
Posts: 10,723 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,723
North Dakota
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I was driving along about 30 MPH, just a steady speed and all of a sudden a big clunk and shake like I ran over something or like something hard broke. I looked in rear view mirror, nothing. I then started easily to get back up to speed and clunk, clunk, clunk. I let off the gas and it goes away. I'm only about a mile from home so I ease it slowly all the time under slight acceleration I get a clunk, clunk, clunk. I stop at stop sign and then proceed and still get the clunk. I go down hill coasting and no noise unless I give it just a little gas. Pop it into neutral and rev engine, everything seems ok. I get it home, put it on lift and everything looks ok, u joints, drivshaft etc. What do you think? Cuda 340,904, 741 differential with 3:55. TIA [censored]. To me it sounds like a disaster. Have it hauled to the nearest toxic waste site. My bets are pull the shaft you lost a cap.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Heard a clunk and then
[Re: A12]
#2994939
12/13/21 03:08 PM
12/13/21 03:08 PM
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Joined: Jan 2003
Posts: 20,796 A collage of whims
topside
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,796
A collage of whims
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FWIW from personal experience: A light clunking - more like a rotational rattle - was a u-joint breaking up. Heavy clunking - again rotational - was a ring & pinion, specifically teeth broken off on the ring gear. In both cases, made it home, but the ring gear event sounded bad, I could feel it as much as hear it. Oh, there was another, again rotational, when a shop under-torqued the pinion nut on my Dana 60; that was more of a lighter clunking, all the time. That one I caught quickly, with no resulting damage.
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Re: Heard a clunk and then
[Re: Stanton]
#2994979
12/13/21 04:58 PM
12/13/21 04:58 PM
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Joined: Mar 2011
Posts: 3,079 Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,079
Michigan
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You said it looks ok on the hoist. Did you run it ? If not.
Put it on the hoist and have someone place in gear and let the wheels spin while feeling the rear axle housing.
Drag the brakes and do this in drive and reverse.
Last edited by Transman; 12/13/21 04:59 PM.
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Re: Heard a clunk and then
[Re: A727Tflite]
#2995140
12/14/21 01:18 AM
12/14/21 01:18 AM
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Joined: Jan 2003
Posts: 10,574 Freeport IL USA
poorboy
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,574
Freeport IL USA
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I've heard that dreaded clunk, clunk, clunk, a few times.
Once I heard in in my car with a built up 318. I pulled over to the side of the road and opened the hood. I saw the fan belt was off, so I grabbed it to try to roll it back on and noticed the crank pulley moving up and down. I was a bit relieved for about a second, it took about that long to notice the harmonic balancer was moving along with the lower pulley. OOPS! Broken crankshaft through the front main bearing. Yea, I broke a crankshaft on a 318. The next motor was a 340.
Another time was with my 3/4 ton pickup. It was loaded up to go to a swap meet when it developed a clunk, clunk, clunk, as I was leaving my buddies shop. I turned around and went back, he was a transmission guy. We took it up the road about 200 feet and the trans grenaded. We managed to coast to the side of the road and drug the truck back to his place where we replaced the transmission, before we went to the swap meet. OOPS!
One other time I got the clunk, clunk, clunk, coming from the rear end on my Road Runner. That one was under acceleration for the first few miles, then by the time I got home it became persistent all the time. On that one, the spider gears had a problem and caused the cross shaft to start spinning. As it spun, it started elongated the hole in the 8 3/4 case and it started to wear a grove in the case. The noise started when the cross shaft finally started bouncing off the outer housing. I felt pretty lucky to make it home on that one. the next center section was a 3:23 Sure Grip.
One other time I was driving down the road and got the dreaded clunk, clunk, clunk, and discovered the needle bearings in the front u joint on the driveshaft were gone. That one wasn't too bad.
Usually clunk, clunk, clunks, are pretty expensive to fix. Gene
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Re: Heard a clunk and then
[Re: JonC]
#2995533
12/15/21 04:15 PM
12/15/21 04:15 PM
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Joined: Jan 2003
Posts: 3,623 Millinocket, Maine
JonC
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,623
Millinocket, Maine
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Driveshaft, U joints and differential look great, no broken or missing anything. Only thing left to do is pull the transmission.
11B40
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