LT1-Camo

well im not sure what could be causing this but when i hit about 90 mph in 5th gear the car starts to vibrate and slightly shake i dont speed very much but every so often ill open her up on an open highway and once i hit about 90 i feel these vibrations and it doesnt sound good any input on what may be causing this...thanks

Green3spd

iTrader: (7)

Bad tires.. tires out of balance.. out of balance driveshaft..
Even had a friend that had a car that shook about 100mph and he rebuilt his tranny and it went away.. it was a 95 A4.. idk what happend there..

RamAir95TA

iTrader: (2)

Common problem for these cars. If you replace your steel shaft with an aluminum shaft out of an LS1 car, it will most likely disappear. It's commonly called "vibeshaft."

99bowtieZ

like said above, check tires and drivehshaft...

LT1-Camo

thanks guys...if i were to replace my stock drive shaft with an aluminum ls1 driveshaft...will there be any modifications i need to make so that i can replace it or will it bolt right up? and is it something that i could do on an afternoon off in my driveway haha just curious cuz that would be my plan....again thanks!

RamAir95TA

iTrader: (2)

You can literally have it swapped out in 10 minutes. It's four small bolts, and it installs right up - no modification necessary.

ALEXZ28

i agree, my brother 93 z is the same way, could be tires or the new driveshaft. starts shaking at high speed.

ScreaminRedZ

iTrader: (3)

It means you've already hit 88 mph and are in the process of going back to the future.

94LT1Bird

iTrader: (4)

gotta be darn close to 1.21 jigawatts....i seriously just stayed up all night watchin the 3 back to the future movies

ss.slp.ls1

iTrader: (36)

^^^

MTBSully

iTrader: (7)

llolzors

slagger

iTrader: (1)

Mine did the same thing around 85 mph and up even when you let off the gas it vibrated untill it got under 85 mph....
I went and got my stock drive shaft balanced and he put in a new unaversal joint and 90% the vibration went away :-) well worth the $50.
I know my tires need to be balanced because I seen one of the wieghts gone and another moved so time for me to get them balanced

1995blacktattop

iTrader: (2)

"when this baby hits 88mph, you're gonna see some serious ****!"

94BlueZ28

iTrader: (34)

My car did this when I had my gears changed, apparently the shop forgot to balance my drive shaft, needless to say after the balanancing everything was kosher!

djjab57

iTrader: (17)

i say tires as well, i like going 150-160 and feel like im just coasting lol but im sure that will change next weekend when i have the 3:73's installed

LT1-Camo

well thanks everyone...i will either get a brand new driveshaft or i will take it to a very reputable shop by my house and have them balance it...ill also have my tires checked out just to be safe...again thanks for all the comments