Hey guys, I have a problem that i really cant figure, out, When i hit higher boost levels in third and 4th gear, mostly, i get this CLunk/ sound, and i can feel it in the shifter, car drives fine, except when i go over 12 psi boost from a low rpm in third or fourth gear,, like a tunk,tunk tunk tunk sound untill i let off, anyone heard anything like this, I was thinking transmission mount but it looked fine, could it be in the clutch, or maybe low gear oil? i hope my transmission is not going.

Thanks,
Jesse Arellano
89 T2, full exhaust, custom polished intake, Fcon, boost controler, autometer gauges,

 

oops year in the title, is wrong, but should not matter
its an 89

 

I have that problem too cant realy tell what it is but mine is in 2nd 3rd i would just say that its been like that for a while and everytime i hold the gear out till redline im waiting to hear a pop...oh yeah my friends used to do that and he dragged his car all the time even 32 times in one day and it still didnt pop and that was going well beyond the redline shifting gears so strange noise yes is it bad??? dont know

 

Probably your driveshaft. The universal joints are "staked" in so you can't change them, have to replace the whole thing. Check to see if you have any play in the driveshaft, in other words will it "give" in either rotation or side-to-side/up-and-down while in the car. (shake it around and twist on it)

FC's commonly have problems with this, and face it, it's a 13-14 year old car.

Brad

 

Load dependent vibration=front u joint.