autobody@sbcglobal.n

i had the d. shaft balanced twice, switch d. shaft with a friend. problem still there. had tires balanced and did a front to rear, cris cross rotation.

Bullitt94

It sounds simple, but make sure the lugs are all tight.

ahittz24

shot in the dark here, how are the bushings that hold the trans crossmember to the unibody, how are the differential bushings? I am having the exact same problem, shakes like its gonna fall apart at 70 and I havent gotten around to diagnosing it yet. Its too hot here and its not a daily driver.

Bullitt94

I was having a shaking problem at about 70mph, and I took the car in and had the wheels balanced and rotated. It's as smooth as a baby's bottom now.

AdderMk2

bring it to someone who has a clue... you obviously dont.

autobody@sbcglobal.n

cross member bushings look good though i have not replaced them. diff bushings, uppers are new. lowers also looked ok, no cracks, not soft. i've tried 3 different shops, 2 were pony speacialists $600.00 later still same problem. though, after i re asembled the tranny and put a new tranny mount on it seemed to get better. i got on it breifly yesterday and now its the same as before i took the tranny apart. also noticed it seems like when its cold in the morning the vib is not as bad. ahittz24- what type of tranny do u have? i know that tko &world class trannys must be raised a bit at the mount. they include a adjustable one.

Jfsram

Stop throwing parts at it and start to narrow down the problem.

Vibration at 70mph in 4rth or 5th gear and the pitch of the vibration does not change . Try neutral also. If the pitch does not change, don't waste your efforts on anything from the clutch forward.

It's driveshaft, axle or maybe wheels/tires.

Easiest thing to do is rotate tires or try a good known set.

Another thing that throws alot of people off is a balanced tire can still shake. It's may be out of round or have a bad spot in the sidewall.

Bullitt94

Sounds like a goodstarting pointto me...

ahittz24

I have a "built" t-5, but I am a firm believer in "you cant make chicken salad with chicken ****", so basically I have a $850 turd beneath myshifter.

autobody@sbcglobal.n

jsfram- ok, nothing clutch foward. also noticed vib starts around 3500-4000 rpm all gears.