Ok here is the situation.I have a 85 Firebird S/E with a 350 in it and it has a automatic transmission.Anyway a couple of days ago I posted that my Bird's wheel was vibrating between the speeds of 40 and 50.Sometimes the whole car even shakes.But thats not the worst part.Between 65-75 and sometimes 85 my whole car starts vibrating like its having a seizure and it is getting annoying.Anyway a couple of guys(thanks again for responding) posted that it was either one of 3 things...

1.Need an Alignment.
2.Rims are bent.
3.Driveshaft is bent or bad.

Anyway I went with the worst possible scenario(in my point of view) first and took my Bird to my mechanic and asked him to check the driveshaft.So he raises the car up and takes a look at it and says it looks fine.I ask him to take it off and look at it just to make sure and he does so.Then he says there is no problem with it.So there goes number 3.Next I go to an alignment place and tell them my story and they say that it might just be a wheel balancing problem.So I fork over the 10 bucks(dont you just love coupons)for the balance and test it out....but nope it still vibrates.So now I plan on taking it back there tomorrow and getting an alignment.

I have a couple of questions though.

First...Is there any place I can go to to get my rims checked to see if they are bent?

Second...Are there any other possible problems I should know of besides these 3?

and Third...This is more of a comment not a question but anyway..I will give 5 WHOLE DOLLARS to anyone that helps me solve this problem because it is getting freaking annoying and even embarrassing when I have my friends in the car.Heck for 5 dollars I know about 20 people are gonna respond and try to get the money =]

Anyway thanks for reading and hopefully you will respond and help me with my problem.

 

Bad wheel bearings, or for that matter, balljoints or practically any other front suspension piece can cause vibrations when worn.

The wrong height tranny mount can cause a vibration by screwing up the tranny output shaft angle.

How 'bout those for starters...free of charge (ain't i a swell guy, lol.)

 

I think the most obvious POSSIBILITY (note that I said possibility) is that you've got flat spotted tire(s). that will make you shake like crazy,


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Clem
SCCA TransAm Series Race Mechanic/CrewChief
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1983 Z28 with LG4, 5 speed, and (unfortunately) T-tops
1983 Z28, NO T-tops, (unfortunately) Auto Transmission (hopefully not for long)

 

Bad U-joint maybe...

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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