help needed please

[Texasmustang]

i have a 86 mustang coupe. the car ran fine before i slightly pulled back the transmission to look to see if i could see wear it was laeking from. well i only moved it about a inch and just put it back on and said to heck with it. now for some reason i feel a vibration under throttle i didnt have before. i just changed the harmolic balancer. that didnt fix it. any help i will take on were to look now.

[Josh.0]

so whats wrong?

[Texasmustang]

I am trying to figure that out. I don't know why it all of a sudden has a vibration

[91GriggsGT]

I would look somewhere between the transmission and rear diff. Did your driveline angle get jacked up when you moved the transmission?

If it was fine before you moved the transmission, start there and see if everything is lined up properly.

[Texasmustang]

Ok i looked at everything all seems fine. I am
Wondering bout the drive shaft though. The big ring thing that is on the front of it. If I grab it I can barely move it is that normal or do I need a new shaft

[80coupe]

u joint? lol big ring thing doesnt tell us to much

[Texasmustang]

I know I don't really know how to describe it. Lol.

[slow84lx]

u joint? lol big ring thing doesnt tell us to much

He's probably talking about the driveshaft dampener.


Are the driveshaft bolts tight? Did you mark the driveshaft to flange and put it back in the same spot? If not, you might try clocking the driveshaft to see if the vibration goes away.

[Texasmustang]

ahh the dampener. thanks should i be able to moove it at all with my hands? botls are tight i thought i put the driveshaft bolted back up like i took it off. i took it off and turned the rearend half way and put it back we will see tomm.

[turbos66coupe]

No the dampner should not move! You have something loose or as said earlier clocked wrong. Did you put the trans mount nuts back on and if its an auto did you tighten the converter bolts

[Texasmustang]

It's a manual trans. Bolts Are all tight. It seems
To have the vibration towards the end of the shifts. If I
Let off it goes away I think it is the dampened now. I
Will see how much that is to get fixed

[Texasmustang]

It is 50 to rebalance the drive shaft. So I wonder if i
Should do it or just buy someones used one for cheaper

[slow84lx]

Balance yours or you will be fighting someone else's vibration issues and you will not be able to pinpoint the problem.

[Texasmustang]

ok i got the drive shaft balanced today. that wasnt it. next?

[RuStYpNuS]

wait.....i thought the t5 drive shafts didn't have a dampener......


bottom is a t5 shaft......how are your u-joints......

if it was me i would find a used aluminum driveshaft and be done with it