Weird clunking noise. - Mustang Evolution

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Old 07-23-2013, 09:31 PM   #1
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Weird clunking noise.

Hey guys. So my 86 GT has a clunk whenever I get on the gas an off the gas. It is worse when the car is cold, once it's warmed up, it'll be less aggressive. I thought it was control arm bushings, so I bought a complete set of control arms. I put the lowers in, and never got around to putting the uppers in. It got a little better after the lowers were installed, so could it be that the bushings are shot in my uppers? I check the u joints, they are all good and I re greased them. Any ideas?
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Old 07-23-2013, 11:45 PM   #2
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Anybody? It's bugging the hell outta me.
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Old 07-24-2013, 12:37 AM   #3
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Most likely your rear differential
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Old 07-24-2013, 01:35 AM   #4
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Most likely your rear differential
As in the ring and pinion gears? That's not what I wanted to hear.

You can feel it throughout the car though. It's not just a noise, you can feel it in the seat of your pants.
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Old 07-24-2013, 10:25 PM   #5
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Bump, anybody else?
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Old 07-24-2013, 10:29 PM   #6
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If it's just a broken pinion it's not that big of a deal. Easy cheap fix
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Old 07-24-2013, 11:17 PM   #7
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Ever check your U-Joints? My old 5.0 had them wear out and it would clunk whenever I got on/off the gas and would start moving. Definitely your cheapest and easiest option to replace lol. Put the car in gear, jack it up, and try and rotate the driveshaft back and forth and see if it has any play. That'll tell you if your U-Joints are worn out.
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Old 07-24-2013, 11:28 PM   #8
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Originally Posted by Boomdizzle View Post
Ever check your U-Joints? My old 5.0 had them wear out and it would clunk whenever I got on/off the gas and would start moving. Definitely your cheapest and easiest option to replace lol. Put the car in gear, jack it up, and try and rotate the driveshaft back and forth and see if it has any play. That'll tell you if your U-Joints are worn out.
I'll have to check the but I'm almost positive the u joints are good.
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Old 07-25-2013, 12:21 AM   #9
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I just ran into my own clunking sound on my fox. Turns out the driveshaft bolts were lose... Specifically the 4 that bolted into the rear-end.
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Old 07-25-2013, 12:23 AM   #10
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I just ran into my own clunking sound on my fox. Turns out the driveshaft bolts were lose... Specifically the 4 that bolted into the rear-end.
I'll have to make a list and check that. It's really getting to me!
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Old 07-25-2013, 11:29 AM   #11
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I agree with both. U joints and or/rear end gears
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Old 07-25-2013, 07:54 PM   #12
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U joints
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Old 07-25-2013, 07:58 PM   #13
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Check everything you can before you pop the cover.
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Old 07-25-2013, 08:07 PM   #14
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I had the same issue, it was a sticky u-joint. The 4 bolts on the rear of the drive shaft could also be it as stated earlier. Also make sure that your torque boxes arent getting warped or torn (look for cracks)
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Old 07-25-2013, 08:45 PM   #15
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I had the same issue, it was a sticky u-joint. The 4 bolts on the rear of the drive shaft could also be it as stated earlier. Also make sure that your torque boxes arent getting warped or torn (look for cracks)
Well I know for a fact that the bottom boxes are mint. Not sure about the uppers but I don't see why they would be faulty. Should I just replace the u joints anyways? They seem fine though.
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Old 07-26-2013, 03:05 PM   #16
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If you take the driveshaft off, move the joints around, if it sticks, is difficult to move or is loose it warrants replacing, do both at once. They are easy to do with some lube and a vice. You can get the kits from any auto part store
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