Driveshaft bushing/Drive shaft coupling/Rubber driveshaft coupler/Giubo joint/Flex disc, whatever you name them they are the same!
A flex disc also known as coupling, Giubo, Guibo, Flex Joint is a flexible reinforced rubber disc used on vehicles using rear wheel driveshaft or all-wheel drive.
The flex disc has 6 bolt holes sleeved with metal guides, three mounts to the driveshaft and the other three to the moving components flange.
Flex disc transfer all the torque to the driveshaft therefore it has to be of the highest grade material
The flex disc designed to allow some angular misalignment between the Driveshaft and the transmission, transfer case or Differential.
Cuts off transmission vibration and sounds, reducing stress on the driveshaft
Mostly used in vehicles such as BMW, Mercedes, Pontiac GTO, Cadillac CTS, VW and Porsche
So today i sorted the scary transmission clunks and thuds that gave me mini heart attacks. Im pretty sure im not the only one here who has experienced this with their E65/66.
Problem started around 2 or 3 months ago where i heard and felt the kick from 2nd to 1st gear while braking. It wasnt that loud at first but gradually became worrying. I researched this forum a lot. Some had issues with transmission itself, others the valve body or mechatroniks.
At one point i was about to order the mechatroniks valves set from the US cause i didnt wanna end up with a broken transmission. I also took it to a transmission specialist who told me that he already has a refurbished valve body. But again this fix was no less than a USD 1000 and warranty of this refurbished valve body was for a week only.
I wanted to have a second opinion on this and the other mechanic totally refuted the idea that this problem in anyway related to Guibo joint. According to him its definitely the mechatroniks and even this solution has NO guarantee that it will last for a longer period of time. He said, he has tried fixing two (E65/66) with the same problem by replacing valve bodies (new) and one car keeps coming back for the similar problem and the other one is fixed. This made me really worried as the whole new transmission costs a fortune and im not prepared to pay for all that.
I still wanted to take the chance on Guibo joint. I mean the fix was a lot cheaper and im not losing anything. Even if the transmission is bad, i'd still be replacing something that needs to be replaced anyway given the mileage on my car. I read the DIYsavecash (the forum member here) posts and watched the video he made on this issue on youtube. Took my car to the mechanic who charged me less than a $100 for the job and replaced Guibo joint in one hour. Fingers crossed
Tell you what, the ride after that is seamless. Its like im driving a new car. No nasty clunks, no kicks while stopping. No P to D or R jerks. Nothing!!!
Im so much relieved and seems like a huge burden is off my shoulders.
Some pictures for the forum to know the culprit here
Old Guibo joint which in my opinion came with the car from the factory. (Has BMW OEM markings on it)
Please notice the play from closed gap to open. I had to turn the back wheel to hear and see how bad it was.
Open gap that caused the play between driveshaft and the transmission
New Guibo joint by Febi Germany. Part# on the sticker for the reference for E65/66
Again i tried to really test how bad old part was broken and as you can see the metal (if i struggled harder with it) would have came out of the the rubber.
Im a happy man today.
卸drive shaft [可选】
卸 flex disc
这是另一种变速箱与drive shaft的连接，开过九十年代初期GM SIERRA 1500就是这种，会漏变速箱液，也会有停车顿挫感。