Vibration

[Wiked03]

Got a weird vibration, so I figured I would post up to see if anyone has any ideas.

The vibe is VERY noticeable, but only when in 5th or 6th gear and gets worse the faster you go, especially over 70-75 mph. If I downshift to 4th, the vibe goes away.

The car is damn near un-drivable on the highway now.



Any ideas?

Am I looking at a tranny rebuild?

Click to read more...

 

[Flyn]

Check your wheel bearings. I had a similar vibration that lessened after replacing the driver's front bearing. Could be any of several reasons in the supspension or drivetrain for your vibe so I'd start with checking the easy/cheap possible causes first.

 

[Wiked03]

Check your wheel bearings. I had a similar vibration that lessened after replacing the driver's front bearing. Could be any of several reasons in the supspension or drivetrain for your vibe so I'd start with checking the easy/cheap possible causes first.

I had that thought too... but why would it only vibe in 5th or 6th?

 

[01Sleeper]

I had that thought too... but why would it only vibe in 5th or 6th?

It's just cuz it's too damn slow




















:joke:
But it is really annoying, I hope you get it figured out

 

[VenomInside]

I remember having some sort of vibe in my cobra and it just turned out to be misalignment. But i hope its something easy and cheap to fix on yours.

 

[blubyu]

That sucks, why are you thinking it's possibly the tranny? Does it feel like it's right under you?

Hope it's just something loose or a worn mount or something.

I had a bad vibe in my 460 LTD and it was somewhat similar (under heavy load). It was the ujoints.

Good luck in figuring it out!

 

[The Pun]

I get a major vibe in the steering wheel above 80 also. I got to bring it to the doc once da red one is done.

 

[Wiked03]

That sucks, why are you thinking it's possibly the tranny? Does it feel like it's right under you?

Hope it's just something loose or a worn mount or something.

I had a bad vibe in my 460 LTD and it was somewhat similar (under heavy load). It was the ujoints.

Good luck in figuring it out!

I guessed tranny because the vibe is only in 5th and 6th gear. I don't feel the vibe at all running 1st-4th up to redline (1/4 mile pass), but as soon as I shift in to 5th or 6th (at any speed) it starts to vibe.

 

[Flyn]

I had that thought too... but why would it only vibe in 5th or 6th?

I don't know. Vibration can have weird causes/effects. The wheel bearings cost $0 to check so might as well start there.

Maybe someone knows if 5th and 6th are run off the same gears in the transmission? If your car is vibrating only in 5th and 6th at any speed, that does sound like the trans.

 

[01Sleeper]

I get a major vibe in the steering wheel above 80 also. I got to bring it to the doc once da red one is done.

This is not a vibe in the wheel, it is the entire car. Hans thinks it is something in the trans since it only does it in 5th and 6th

 

[WhtSuperStang]

I get a major vibe in the steering wheel above 80 also. I got to bring it to the doc once da red one is done.

sounds like brakes

 

[WhtSuperStang]

I guessed tranny because the vibe is only in 5th and 6th gear. I don't feel the vibe at all running 1st-4th up to redline (1/4 mile pass), but as soon as I shift in to 5th or 6th (at any speed) it starts to vibe.

call up DRC in elk grove or g-force and inquire about that, if its transmission issues a trans shop would be the place to start. they can usually do a good estimate of what it might be over the phone if you can discribe the issue well enough

 

[blubyu]

Muffler Bearings!

 

[ChromeCobra]

Muffler Bearings!

+1 :lmao:

 

[The Pun]

sounds like brakes

Could be, mine are shot. They had a long summer of triple digit speed stops.

 

[rdsnake]

damn carl that sucks, it seems like nothing but problems since the soild was in...u-joints/drivershaft mis aligment???

 

[ShelbyGuy]

what is your pinion angle set at

 

[Mystic Terminator]

If you wind the engine out to 100MPH in 4th, do you get the vibe?

 

[zenriddles]

If you wind the engine out to 100MPH in 4th, do you get the vibe?

+1

Sounds like it might be a halfshaft problem, assuming you still have the IRS in it. This happens a on MN - 12 Tbirds/ Cougars/ Mk 8's when the rear end IRS setup gets sloppy in the CV's.

 

[rdsnake]

+1

Sounds like it might be a halfshaft problem, assuming you still have the IRS in it. This happens a on MN - 12 Tbirds/ Cougars/ Mk 8's when the rear end IRS setup gets sloppy in the CV's.

re-read

damn carl that sucks, it seems like nothing but problems since the soild was in...u-joints/drivershaft mis aligment???

notice the soild?

 

[zenriddles]

re-read

damn carl that sucks, it seems like nothing but problems since the soild was in...u-joints/drivershaft mis aligment???

notice the soild?

:-o
No, I missed that. huh.

Back to the pinion angle mentioned earlier as best first choice. Driveshaft re-balance just to be sure?

 

[Wiked03]

If you wind the engine out to 100MPH in 4th, do you get the vibe?

I guessed tranny because the vibe is only in 5th and 6th gear. I don't feel the vibe at all running 1st-4th up to redline (1/4 mile pass), but as soon as I shift in to 5th or 6th (at any speed) it starts to vibe.

 

[cyac5l8trfcar]

Well...Since you described as only in those gears gotta say it's in the trans. What rpm does this happen at? is the rpm the same in both 5th and 6th? Could be a clutch/t.o.b. problem as well. I'll see if i can borrow a very handy vibration device from my work this weekend and we can narrow it down big time. It's called an E.V.A. II and it will tell us if it's driveline, wheel, or engine speed and that should help.

 

[Wiked03]

Well...Since you described as only in those gears gotta say it's in the trans. What rpm does this happen at? is the rpm the same in both 5th and 6th? Could be a clutch/t.o.b. problem as well. I'll see if i can borrow a very handy vibration device from my work this weekend and we can narrow it down big time. It's called an E.V.A. II and it will tell us if it's driveline, wheel, or engine speed and that should help.

Doesn't seem to RPM specific, although it does get wore as the RPMs climb.

That would be awesome! Let me know if you can.

 

[Pressure Ratio]

Carl, Did you check your pinion angle after you fixed your control arms? Like a couple people mentioned before pinion angle might be something to look at. If it has to much negative pinion angle while cruising it can cause the U-joints to bind and cause a vibration. You don't notice it under acceleration because the rear end housing is rotated and it brings the pinion up. Then when you get off the throttle and shift to 5th & 6th and not under heavy load the rear end rotates back done and binds the u-joints again. I have seen that a few times before.