wcmgoldie Posted October 17, 2014 Share Posted October 17, 2014 I started hearing a rattling or thuking noise coming from the center of the car. At first it would only make the noise in a hard right hand corner then throughout the cruise it became much more frequent. It was hard to tell where exactly the noise was coming from. I made sure nothing was loose with the heims or suspension and gave the car a good shake down. everything seems solid. i took out the center console and it seemed like the noise is coming from the start of the diff where the driveshaft attaches, I could be wrong though. Nothing is touching the drive shaft that would cause any vibration or rubbing. I have a few video clips ill try to see if the will upload Link to comment Share on other sites More sharing options...
jlumba81 Posted October 18, 2014 Share Posted October 18, 2014 Loose driveshaft bolts? Link to comment Share on other sites More sharing options...
coffee break Posted October 18, 2014 Share Posted October 18, 2014 Loose driveshaft bolts? :iagree: That's what I found when I was taking the tranny out of my car. All four were loose enough to be easily turned with a wrench. I've got fresh bolts and locknuts to go in during reassembly. Link to comment Share on other sites More sharing options...
Mondo Posted October 18, 2014 Share Posted October 18, 2014 Yep, had that clunk sound and it was loose driveshaft bolts to rear diff (kind of hard to reach) Link to comment Share on other sites More sharing options...
HOTTTCAR Posted October 18, 2014 Share Posted October 18, 2014 Had that in a car a few years ago. A couple of the u-joint needle bearings had failed and the trunnions were rattling around inside the caps. Got it fixed before the joint broke loose. Gale Link to comment Share on other sites More sharing options...
powderbrake Posted October 18, 2014 Share Posted October 18, 2014 I had some wierd clunking noises when I first assembled my kit. After pulling the diff, and lots of looking, I finally took out the driveshaft, and the front u-joint cage was broken, and balls were loose in there. I called Brian Anderson and he immediately sent me a new driveshaft, and all is well. Link to comment Share on other sites More sharing options...
WestTexasS2K Posted October 19, 2014 Share Posted October 19, 2014 Ultralites us CV joint on front and U joint in the rear. I have seen this happen a few times over the years. I suspect that the metal U shaped brace that the diff mounts has an issue on the front support. I think that the sheet metal has torn and allowed the diff to drop and its hiting the rear u joint as it rotates. Or the rubber bushiing has broken. Usually it happens from getting on and off the throttle. If the metal has torn then the solution is to weld a reinforcement strap around the nose of the metal shell. Most of the later cars had this strap added but some of the earlier cars just had a hole drilled thru the metal brace. You will need to pull the trans cover and see what going on there. A diff support brace will keep the nose section from ripping out. Link to comment Share on other sites More sharing options...
WestTexasS2K Posted October 19, 2014 Share Posted October 19, 2014 With the trans cover pulled out the drive shaft will look like it clears everything. If you look back under the u shaped metal cover the diff nose has about a 4" round flange that the U joint adapter bolts to. That is where the noise is most likely coming from. The bolt that holds the nose up can collide with the u joint if over tightened. Link to comment Share on other sites More sharing options...
rnr Posted October 19, 2014 Share Posted October 19, 2014 Picture of mine with the reinforcement after it ripped on a trackday Link to comment Share on other sites More sharing options...
WestTexasS2K Posted October 19, 2014 Share Posted October 19, 2014 I was hoping someone had a picture handy. Link to comment Share on other sites More sharing options...
wcmgoldie Posted October 20, 2014 Author Share Posted October 20, 2014 Awesome thanks for the pictures and responses. I will have to take a better look now that I know what I'm looking for. I tightened the 4 drive shaft bolts so far and only one was a tiny but loose. The car is making the vibration most now when I slightly back off the gas and decelerate. Link to comment Share on other sites More sharing options...
wcmgoldie Posted October 20, 2014 Author Share Posted October 20, 2014 When I tightened the 4 drive shaft bolts the diff seemed to rotate to the side under a lot of torque from the wrench. I was like hmmm min not sure if the diff your turn on it's side like this. Link to comment Share on other sites More sharing options...
wcmgoldie Posted October 20, 2014 Author Share Posted October 20, 2014 Hmm I'm not sure if the diff should turn on it's side like this* sorry for the bad typing I'm on my phone 3 am at work haha Link to comment Share on other sites More sharing options...
WestTexasS2K Posted October 21, 2014 Share Posted October 21, 2014 check the bushings that are on diff cover that secures it to the chassis in the trunk area. Maybe you had a bushing rupture back there. Link to comment Share on other sites More sharing options...
jimrankin Posted October 25, 2014 Share Posted October 25, 2014 Since the rear mounting bolts go through rubber grommets and the front is a single center mount you are going to still have a lot of torque twist unless you also add a differential brace like most of us who seriously beat the cars have had to do. I tried to upload a photo but it wouldn't let me because it was already in a previous thread called "reverse lights". It will be the red inverted "V" shaped item if you find it on here. Link to comment Share on other sites More sharing options...
Mondo Posted October 25, 2014 Share Posted October 25, 2014 Here's mine Link to comment Share on other sites More sharing options...
wcmgoldie Posted October 26, 2014 Author Share Posted October 26, 2014 Thanks for all the help. I know that the front diff mount is ok and it looks like it was reinforced in the past. I'll have to check. The rear mounts but I found that the bolt that hold my exhaust to the hanger fell out since it's a new exhaust. That's probably where the vibration is coming from. Pretty simple fix once I find the right bolt to put back in there. Oh well at well at least I gave the car a good look over if it's nothing else. Link to comment Share on other sites More sharing options...
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