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Vibration issue....

Reply #15 –
There was no run out on the shaft?
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

Vibration issue....

Reply #16 –
stick a large hose clamp on the driveshaft and see if you can counter the vibrating by changing the position in 45 to 90 degree incremints. If it only gets worse, and doesn't get better, then it probably isn't in the drive shaft. I have had alot of bad luck with wheels and tires being balanced correctly, as well as the front suspension having alot of slack in it.
Quote from: jcassity
I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
Hooligans! 
1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
1986 cougar.
lilsammywasapunkrocker@yahoo.com

Vibration issue....

Reply #17 –
My Mustang did this and one of the axles were bent. 100% stock rear and drivetrain in the car with about 65,000 miles on it.

Vibration issue....

Reply #18 –
Quote from: Haystack;280526
stick a large hose clamp on the driveshaft and see if you can counter the vibrating by changing the position in 45 to 90 degree incremints. If it only gets worse, and doesn't get better, then it probably isn't in the drive shaft. I have had alot of bad luck with wheels and tires being balanced correctly, as well as the front suspension having alot of slack in it.


exactly.

or, your out of phase like Dr D said.

being out of phase on a two piece d/s is more common such as in the 4wd world.  With our one piece d/s, If you installed one of your ends on the opposite way, then it nulls out your whole "I had it balanced" theory.  Mark that shiznit before you take it apart. That would make it out of "phase",, kinda but not exactly.

Vibration issue....

Reply #19 –
Marking it didn't really seem appropriate when it was removed (the driveshaft) because the drive shaft,tranny,engine,differential,and pretty much every part of the car came from different vehicles.

As far as a bent axle,I'd think if the axle was bent,wouldn't give me trouble before 75 MPH?,and also,after swapping the u-joints,the vibration still comes up at 75 or so,but then goes away after 80.I need it gone completely.I'm buying new bearings and seals today after work and installing them this weekend (weather permitting) and see what happens.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Vibration issue....

Reply #20 –
I get where your coming from on the "everything came from a diff car"

But try flipping the u-joint around on the rear. mabe try another (not sure what that piece is called that bolts the u-joint to the rear) LOL

Maybe you got a bad bushing or loose bolt on a rear arm(s) transferring vibration?
[SIGPIC][/SIGPIC]
***** Project "EVOLUTION" 1987 Cougar LS  & 1985 Cougar Convertible *****
[/COLOR]
5.0 HO 306 roller block, machined GT-40P heads, Wiseco dished forged pistons, Eagle forged floating I-beam connecting rods, Lunati pushrods, ARP bolts, Scorpion aluminum 1.6 rockers, Comp Cams Magnum 266HR, Explorer intake, 65mm TB, MAF Conversion, 19# injectors, Ford Racing stainless P-headers, 2-1/2" cat-less exhaust w/ Flowtech Afterburner lers , SC AOD with 2800 BDR torque converter, 3.73 T-Lok rear, CHE rear control arms, full 2-1/2" frame w/1" jacking rails & seat supports, Rear disk brakes, Turbine wheels, All original interior w/ floor shift upgrade .......
Pretty much every panel on my 87 is new, rebuilt, or re constructed. :D
Join us on Facebook
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Vibration issue....

Reply #21 –
Some have said it is possible for the input shaft of the tranny to do that vibration thing.

Unsure how to diagnose that, Im really helpful.
Mike

Vibration issue....

Reply #22 –
or tailshaft bushing
 

Vibration issue....

Reply #23 –
It did it with the aod to didn't it? while you got it apart check the pinion bearing for excessive play.
Old Grey Cat to this.88 Cat, 5.0 HO, CW mounts, mass air, CI custom cam, afr165's, Tmoss worked cobra intake, BBK shorty's,off road h pipe, magnaflow ex. T-5,spec stage 2 clutch, 8.8 373 TC trac loc, che ajustables with bullits on the rear. 11" brakes up front. +

Vibration issue....

Reply #24 –
What is the frequency of the vibration?  Is it a higher or lower frequency?  Can you feel it in the steering wheel?
 
I've solved a couple of vibration problems by removing the wheels and cleaning the mating surface from the brake to the wheel.
One 88

Vibration issue....

Reply #25 –
To me, it sounds (seems) like a tire issue. Is it possible one of your new tires has a knot?

I had a knotted tire one time, it would only vibrate right at 65 mph...
Spent an hour changing a rotor and bearings/seals, only to notice a slight knot in the  tire as I was putting the wheel and tire back on...
1 new tire later, I was ridin' smooth again...

I'd think with brand new tires, it's quite unlikely...but anything's possible.

If the problem wasn't there before, and the only thing changed is the wheels and tires...;)

I'm hopin it's not something expensive though Vman.
'98 Explorer 5.0
'20 Malibu (I know, Chevy, but, 35MPG. Let's go brandon, eh)

Vibration issue....

Reply #26 –
Can't feel it in thwe wheel.I'm going to invest a little time this Sunday.I've been back and forth to my grandmother's a lot lately.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Vibration issue....

Reply #27 –
Use the big hose clamp. Did it do it before your new wheels? Are you sure that the wheels are balanced? I hate the front suspensions on these cars. Every vibration I have ever had was one of these two things, or loose/stripped lug nuts.
Quote from: jcassity
I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
Hooligans! 
1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
1986 cougar.
lilsammywasapunkrocker@yahoo.com

Vibration issue....

Reply #28 –
Everything in the front has been replaced.It did vibrate around 75 and up for quite a while.After I swapped the u-joints,less vibration AFTER 80,but still around 75 or so.I feel it in the shifter handle and the floor,not the steering wheel or pedals.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Vibration issue....

Reply #29 –
I bet the part that bolts the u-joint to the rear is out of whack
[SIGPIC][/SIGPIC]
***** Project "EVOLUTION" 1987 Cougar LS  & 1985 Cougar Convertible *****
[/COLOR]
5.0 HO 306 roller block, machined GT-40P heads, Wiseco dished forged pistons, Eagle forged floating I-beam connecting rods, Lunati pushrods, ARP bolts, Scorpion aluminum 1.6 rockers, Comp Cams Magnum 266HR, Explorer intake, 65mm TB, MAF Conversion, 19# injectors, Ford Racing stainless P-headers, 2-1/2" cat-less exhaust w/ Flowtech Afterburner lers , SC AOD with 2800 BDR torque converter, 3.73 T-Lok rear, CHE rear control arms, full 2-1/2" frame w/1" jacking rails & seat supports, Rear disk brakes, Turbine wheels, All original interior w/ floor shift upgrade .......
Pretty much every panel on my 87 is new, rebuilt, or re constructed. :D
Join us on Facebook
http://www.facebook.com/home.php?sk=group_137541156293768&ap=1