3 73s installed... vibration at 120km/hr and up now

[mississauga5.0]

Da'Sousa racing in Millton, Ontario installed my gears and i immediately noticed a vibration at at higher highway speeds. I have basic mods like Professional Intake and BBK headers so im not tearing up the drivetrain but im curious if this shaft can handle all this pavement pounding.

BTW i did have the vibration before but at like 175 - 180km/hr. I know the gears changed the spinning of the DS duhh,

BUT will this puppy pop out??? I still want to rip 3rd and 4th

 

[niklid05]

It wont pop out. Just vibrate like a son of a bitch at highway speeds. The harmonics changed and you either need to get the original drive shaft rebalanced or get an aluminum one. I had the same problems and got an frpp drive shaft locally and vibrations stopped right away.

 

[Dean85GT]

I tried rebalancing my original and it didnt do a thing...As soon as I bought an aluminum driveshaft it went right away

 

[mississauga5.0]

so without balancing do you think its safe to occasionally boot it up to 120km/hr where it vibrates?

before that its fine.

 

[thefordkid1]

Your driveshaft is spinning faster now at 120 km/h. What gears did you have before? I'll bet it is spinning now just as fast at 120 km/h now as before at 175 km/h with stock 2.73s. (If you did have 2.73s)

 

[mississauga5.0]

yeah you got it , i had stock gears before and the viration was way at the high end of speedo.

but again im just asking is it safe to occasionally boot around town 3rd and 4th gear and occasionally over120km/hr?

are the harmonics thats unbalanced that it will break?

 

[ninety15.0]

i highly doubt its going to break. However, i wouldnt make a habit of doing it either. Vibrations have a funny way of making round things into ovals.

 

[mississauga5.0]

lol oval.

yeah it seems most guys upgrade to a ffrp ds and it seems to go away. not in budget right now tho so thats why im trying to get an idea about kicking it for now. thanks

 

[Dino Dino Bambino]

After I had my 3.73 installed my stock 20lb rear driveshaft would vibrate at any speed over 165kph. A new FRPP aluminium driveshaft (only 11lb) cured the problem and now my Stang is vibration-free even at 200kph.

 

[mississauga5.0]

sounds identical to my issue. BUTTTT im asking if everyone thinks its okay to still boot it on the streets with that vibration over 130km/h

i know a swap will help but its not in my budget right now

 

[Foxfan88]

i highly doubt anything will break with messing around and taking it up high. just will vibrate and cause a rough ride.

when you do finally address the situation, do yourself and favor and get the FMS alum DS.

i fought the same vibration problems with my gears installed and i kept dinking around trying to get new DSs and etc. i was hesitant at first spending that much on a DS but i am glad i did, well worth the cash for the nice alum piece. better balanced. pulled it straight out of box and bolted it on the car COMPLETELY fixed my vibrations, smooth as silk as high as i have taken it lol

 

[mississauga5.0]

thanks for the responce. thats exactly the feedback im looking for.