My '86 Bird has a really bad vibration over 60mph and around 40mph. I tried two driveshafts, both with new u-joints, and the problem is still there.

The vibes are there if it is in neutral, the clutch is in or it is in gear (ie. all the time). To me, this rules out engine problems.

I did swap in a T5, could there be an alignment problem? How would I check for it?

I am at my wits end

Thanks in advance
Dale

------------------
1986 FireBird
2.8L MPFI
Gutted Cat, No muffler (Sweet Sound)
Was 700-R4 --> Now T5

[This message has been edited by 86Chicken (edited August 17, 2001).]

 

Balance your tires?

Good, evenly worn tires on your car?

Front end aligned?

------------------
92 Camaro RS, LO3, 5-spd, T-tops

Performance:
K&N Open Air Filter, Edelbrock performer TBI intake, Fastchip Prom, Timing +4 degrees, Centerforce clutch, Xact 8mm wires, SLP 1 3/4" Headers (coated), Flowmaster Catback Exhaust, Z28 Grille w/aftmkt fog lamps, MacEwen white-face guages
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, 3.42 gears w/Torsen posi

 

Oh, yeah, I forgot to mention that...

Rear tires are new and balanced. Front are not new but OK. I rotated the tires to see if that was the problem but there was no change.

The front end was aligned about a year ago, but the vibration is there even the car is run up to speed while on blocks.

Dale

 

Bent or twisted axle would be my guess.

If it does it on blocks...that obviously rules out anything in the front end.

Torq

 

Bent axle, huh? Makes sense.

Can I check for a bent/twisted axle without pulling the axles out?

Dale

 

Too easy...

To check for a bent axle, put the rear axle up on jack stands, put the car in gear, and look to see if a wheel wobbles. If it does, swap the left & right, and see if the wobble stays or moves to the other side. Same side = bent axle, moves to other side = bent wheel.

------------------
"So many Mustangs, so little time..."
ICON Motorsports

 

What about the torque arm??

Was the vibration there before or after the t5 swap?

 

What ABOUT the torque arm????

The vibes started about 1000 miles after the swap. The torque arm is attached using the T5 mount. I do not know how to tell if it is at the correct angle/position or not.

Dale

 

Well, I checked to see if the wheels wobbled per RB83L69's instructions and both sides have a little (3/64" +/-) wobble but I can't tell if it is the wheels/tires or axle.

Any other suggestions?? This is driving me nuts.

Thanks,
Dale

 

You may have an issue with the pinion angle, or possibly the tailshaft on the T-5. I'll try to find specs on the inclination of the pinion.

I would have better access, but I just spent most of yesterday afternoon and evening reinstalling Win98, configuring the system, and reinstalling most of the applications because of the Sircam.exe email virus infecting my boot sector. Really funny - I was rubbing the slide on a chrome 45ACP just waiting for something to "vent" on...

------------------
Later,
Vader
------------------
"Get UP - Drop the bombshell!"
Adobe Acrobat Reader

 

vader....sucks huh!! i got a nice one about 5 months ago...my comp is still alittle funky... whadda ya say...we get together and have our selves an "office space" party. you bring the music and ill bring the 9mm for haa haa's ill bring a bat too and amybe an old copier

------------------
87 z28 bowtie aluminum 420small block dry sump crower lt. wt. knife edged crank oliver lt wt rods brodix track 1's super ram intake slp 1 3/4 headers accel dfi art carr 700 r4 3.42 gears ssm sub frame/ladder bars.....other parts on the way ,soon to be finished!! couple more weeks!!!

http://people.ne.mediaone.net/gdm

 

I wondered about the pinion angle when I put in the tranny but forgot about it when everything seemed alright at first.

How do I measure the angle? Can I just do this with a level and a protractor or do I need something more precise?

What is it supposed to be?

If it is wrong, how do I go about fixing it?

Thanks for all the help!!!!

BTW - I know how you feel about cleanng up after a virus (I prefer my 9mm tho. ).

Dale