Woodard2589

i have an 89 lx hatchback and when the car gets to be around 100 mph or so it begins to shake a lot but doesnt do it at any other time. A friend of mine who knows alot about these cars thought the driveshaft might be loose and thats why but when i checked it it seemed fine. i havent seen him again to ask him about it so I was wondering if you guys might have any ideas why it could be doing this.

black89gt

check your u joints.. if you twist the driveshaft back and forth and there is a good amount oof paly, then your u joints are probably bad. and yes bad u joints do cause vibrations at highspeeds.

rmodel65

if it does it at 100 then it does it at 50 and 25 etc probably alot less noticable but there still there

gt884me

Could be your alignment

Woodard2589

alright ill check the u joints then when iget home. my first guess as well was possibly the alignment.

vristang

Have you changed the gears?

Bigger gears tend to require a better drive shaft.

The balance of the driveshaft is more important after a gear swap.

An Al driveshaft from Ford usually fixes the problem, so most folks say.





jason

7upedition

I didn't know the driveshaft balance affects the gears? but it does make sense since they are linked together! Good info as always vristang...

I was thinking check alignment and front end bearings and bushings?

bernout

the aluminum driveshaft with the new "high performace" u joints fixed that exact probly in my car
except i was getting vibrations at like 70 mph pretty bad... with 4.10s

pretty cheap.. 4 bolts on/off and youre done

7upedition

what'd you pay for the aluminum driveshaft from ford? @ work... means no summitt [:@]

1993 5.0

I have a vibration at 80-90 and I have had tires balanced, u-joints were fine, etc.... Finally found out my driveshaft was bent a little, just bought the FMS aluminum driveshaft and putting it on tomorrow, so I will let you know if that fixes it.