got some vibes i want to sort out.

[dastang2]

ok it is an 89 coupe with a 3.08 rear with the dogbone still attached. the driveshaft is stock and the t5 is stock. i have solid motor and tranny mounts and subframe connectors that are , it is hard to explain it but the back seat floor boards are humped up like a tunnel or something. the humps are about 2-3 inches high and wide. i know it has subframes i just don't know how they were put in. anybody get what i mean. anyway this was done by a previous owner. that is not the point though although if anybody has any info on how this was done, i wanna know. i had some 10 holes on the back with some viper tires. my driveshaft came off after 3 bolts backed out and one sheered clean off and hit the pavement and my car pretty hard. but there is no visual damage to it at all. i put it on and tightened the 4 bolts. somebody slashed my rear tires(vipers, they are missed, i could burn down for forever every day and i would barely lose any tread.) that night so i put my front tires on my rear and i bought some centerline front runner auto drags with E/T fronts on them for 50 bucks. the first time i got to drive this car after the new rims, driveshaft problem, it starts vibrating at a certain speed and i mean bad, the seats go back and forth a lot. is it possible i messed the driveshaft up and it is not showing any damage or could it be the centerlines need a balancing. will a t5 start to viberate like that if it is getting old too. i tried to balance the rims today but the balancer is broken at my school. any info is needed here. if i need a new driveshaft i think i will go to a junkyard and get one off of a 92 van.

 

[88stangmangt]

once taken off if not marked the D/S MUST!!!!!!!!!!!!!! be balanced................. i wouldnt mess with it now.................buy a alum one from summit..........................also the make shift rim/tire combo you got going on could also be the culprit but since you said your d/s sliped out im gonna put money on that.................anywho find the F@GGOT that was jealous of your tires and throw that old D/S through his windsheild....................

 

[HISSIN50]

yep, i would get a new DS (or atleast dynamically balance the old one on the car, so the entire reciprocating assembly is balanced). even with a balanced shaft, when you bolt it up it would likely be out of phase.
good luck.

 

[UMDSmith]

Extreme vibration like you describe is almost always a misbalanced driveshaft, since it only happens at certain speeds. I had a similiar problem and a new DS fixed it. The bad thing is now you have to pay 260 for a new DS instead of the old 160. It still is cheaper then a decent rebalancing, and saves a few lbs as well.

Start with the DS, then if still some vibration get align and balancing. I'm 99% sure it is the DS though.

 

[dastang2]

actually the reason they slashed the tires was because i have straight headers and i was following behind an 85 monte carlo ss with a big hood and dumped flows about 45 because i knew the DS was about to drop and it did right in front of those asses house(big group of drunken adults). i got out to get the DS and they started laughing so i told them off and went back to get a chain to get it pulled. 2 minutes later we came back to find 2 flats. i know it was them. we were getting towed back in front of there house by the SS so we started revvign both cars up and told them to bring it and face up. but they were sissies. then 20 minutes later the cops showed up and i had my car on jack stands with the tires off. the people said we were racing and yelling out death threats. i will get them back. i'm thinking nails in the driveway. i don't live there anymore and i don't talk to the ss guy anymore so they won't suspect me.

 

[88stangmangt]

I still stand by my D/S idea..........

 

[dastang2]

also i am trading some 460 frame perches from a 79 f150 for some 2 inch drop springs for my coupe. is there a problem with dropping it that much. do i need any extra items. this is not a street car yet. i have not even raced it yet besides the SS with the 350. this is my email.

NEED ENG TOWERS.WILL TRADE 4PONEY PARTS 86-93 SPRINGS J- MAX 2 IN DROP OR BBK COLD AIR INTAKE

 

[dastang2]

well today while testing it i noticed that my whole tranny was vibrating and so was the crossmember. i don't have the shifter boots on right now. anyway i am pretty sure that the DS is out of wack