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Popping sound coming from front end? #79194
06/24/08 02:24 PM 06/24/08 02:24 PM
Joined: Aug 2003
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Ohio
rck850 Offline OP
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rck850  Offline OP
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Two years ago I completely rebuilt the front suspension on my 74 roadrunner and since it has had a popping sound that is somewhere in the frontend. it doesn't do it all the time like a constant everytime the suspension moves but just every once and a while driving on a relativly smooth road it will make that noise. does anyone have suggestions? Everything is new except the torsion bars could that be the problem? Thanks
Re: Popping sound coming from front end? [Re: rck850] #79195
06/24/08 02:38 PM 06/24/08 02:38 PM
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Gilbertsville, PA 19525
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Pntastar69 Offline
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Rubber or poly bushings? I'll bet on poly.
Re: Popping sound coming from front end? [Re: rck850] #79196
06/24/08 02:42 PM 06/24/08 02:42 PM
Joined: Jan 2007
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Quote:

Two years ago I completely rebuilt the front suspension on my 74 roadrunner and since it has had a popping sound that is somewhere in the frontend. it doesn't do it all the time like a constant everytime the suspension moves but just every once and a while driving on a relativly smooth road it will make that noise. does anyone have suggestions? Everything is new except the torsion bars could that be the problem? Thanks



Something has to be loose somewhere in the front end for it to be popping.

A buddy of mines car was popping in the r/f when he applied the brakes. He swore he had looked at everything and couldn't find anything. As soon as I jacked it up with the floor jack I could see where the r/s rear upper controll arm bushing sleeve was moving in the UCA.

Kayse can't keep up at all now. lol
Re: Popping sound coming from front end? [Re: Pntastar69] #79197
06/24/08 03:01 PM 06/24/08 03:01 PM
Joined: Aug 2003
Posts: 1,385
Ohio
rck850 Offline OP
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Quote:

Rubber or poly bushings? I'll bet on poly.

Actually it was a stock rebuild so I went with rubber. Thanks I will check the UCA bushings and also the other bolted connections.
Re: Popping sound coming from front end? [Re: rck850] #79198
06/24/08 03:40 PM 06/24/08 03:40 PM

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Check your A-Arm Bolts. I left one loose after my build and it was doing the same thing.
Re: Popping sound coming from front end? [Re: rck850] #79199
06/24/08 04:05 PM 06/24/08 04:05 PM
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JohnRR Offline
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did you change the bushings between the K and the body ?
Re: Popping sound coming from front end? [Re: JohnRR] #79200
06/24/08 04:19 PM 06/24/08 04:19 PM
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Posts: 1,385
Ohio
rck850 Offline OP
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Well most of the noise disappeared when I tightened the UCA bolts btw what is the torque spec on the nuts that hold the UCA on the piviot bar? I have never replaced the bushings between the K frame and the front subframe as far as I know they are not even being reproduced. Mine look fine though and have very few dry cracks in them.
Re: Popping sound coming from front end? [Re: rck850] #79201
06/24/08 04:26 PM 06/24/08 04:26 PM
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JohnRR Offline
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Quote:

Well most of the noise disappeared when I tightened the UCA bolts btw what is the torque spec on the nuts that hold the UCA on the piviot bar? I have never replaced the bushings between the K frame and the front subframe as far as I know they are not even being reproduced. Mine look fine though and have very few dry cracks in them.



the fact that they have any dry cracks in them means they need to be replaced , you can get a solid spacer to replace the bushing . have you actually gone to the auto parts store and ASKED for them ? i would be surprised if they aren't still available .

oh and get a factory service manual while you are at it , they are invaluable
Re: Popping sound coming from front end? [Re: JohnRR] #79202
06/24/08 04:34 PM 06/24/08 04:34 PM
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Florida
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look at the strut rods bushing also

Re: Popping sound coming from front end? [Re: scratchnfotraction] #79203
06/24/08 04:46 PM 06/24/08 04:46 PM
Joined: Jan 2003
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S.E. Michigan
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Burred-up or dry torsion bar ends can cause that also, though it's usually more of a 'pop' and a 'ping' sound at the same time.

Rich H.

Esse Quam Videri




Re: Popping sound coming from front end? [Re: ZIPPY] #79204
06/24/08 06:36 PM 06/24/08 06:36 PM
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lewtot184 Offline
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try lubricating the pivot point of the strut rod at the lower control arm.
Re: Popping sound coming from front end? [Re: lewtot184] #79205
06/25/08 04:06 AM 06/25/08 04:06 AM
Joined: Aug 2003
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Ohio
rck850 Offline OP
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Thanks for all the help tomorrow I will try what has been said here.
Re: Popping sound coming from front end? [Re: rck850] #79206
06/25/08 11:11 AM 06/25/08 11:11 AM
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LA & L.A.
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Have you noticed if it happens most of the time when you are applying the brakes? Or just regular driving that involves suspension travel?

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Re: Popping sound coming from front end? [Re: MoparPosterChild] #79207
06/25/08 11:54 AM 06/25/08 11:54 AM
Joined: Aug 2003
Posts: 1,385
Ohio
rck850 Offline OP
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rck850  Offline OP
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regular driving, I don't know if I've ever heard it while applying the brakes
Re: Popping sound coming from front end? [Re: lewtot184] #79208
06/25/08 01:04 PM 06/25/08 01:04 PM
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USA
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Quote:

try lubricating the pivot point of the strut rod at the lower control arm.



That's a definite possibility. My blue car started doing that in the mid-70's, especially when driving over a rise & then coming back down. The service manager @ the C-P dealer told me to blow some graphite into that point & that took care of it.
Re: Popping sound coming from front end? [Re: b54406barrel] #79209
06/25/08 01:33 PM 06/25/08 01:33 PM
Joined: Aug 2003
Posts: 1,385
Ohio
rck850 Offline OP
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well I laid under the front of the car today and basicly bench pressed the front end up off the suspension and bounced it around, the sound really sounds like its coming from the front torsion bar area. I am still going to lubricate the strut rod mounts but does anyone know what I can do in the torsion bar area? Should I support the car and back off the adjuster and lubricate the area and then run the adjuster back up to set the ride height?
Re: Popping sound coming from front end? [Re: rck850] #79210
06/25/08 01:47 PM 06/25/08 01:47 PM
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My '70 service manual doesn't have anything about how to lubricate a torsion bar when it's assembled. Just says to coat both hex ends with lubricant #2525035 after inserting it through rear anchor. That's just regular wheel grease as I recall. I don't think lubricating where the adjustment bolt 'rides' would do much but you could give it a shot.
Re: Popping sound coming from front end? [Re: rck850] #79211
06/25/08 01:49 PM 06/25/08 01:49 PM
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lewtot184 Offline
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the torsion bars and hex sockets are greased from the factory. if that wasn't done during a rebuild the only way to correct it is taking the bars out and greasing them. i've had popping issues before. in my case it was the the strut rod pivot point at the lower control arm. i didn't lube that point when i rebuilt the front ends on both my coronets. if i had it to do over i would use some type of anti-sieze lube on that pivot point. i've had fairly good luck using Rust-Check spray lube on squeaky-popping front ends.

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