Nasty Vibration

[Mike Voth]

Originally Posted by W J

Just random thoughts, but 1, Make sure rear hasn't moved (string-measure both sides, center of front whl. to center of back whl.) 2, Pinion bearing going bad, or something moved inside rear? Good luck....WJ

Housing is centered. Pinion bearing feels good and rotates smooth, but 3rd member is coming out tonight, so we'll see. Thanks

[Stephen & Horace Johnson]

Originally Posted by Mike Voth

The Monte has developed a very bad vibration in high gear. Changed driveshafts and the problem seemed to lessen temporarily, but it's back as bad as before. The driveshaft is straight. Dad can barely hold the shifter back in 4th as he crosses the finish line. We are taking the tranny apart to see if the mainshaft is bent or ???. Can a ring gear be out of balance? We are sending the clutch and disk away to get balanced. Axles ???.

Any help would be appreciated as we're really scratching our heads on this one.

Many thanks in advance!!

I had the same issue on my 5speed mustang, it would vibrate so bad that it would jump out of gear as soon as i pulled into gear. It was my mainshaft that was bent. I took it to work and put it on jig and realize it was bent!!! I junked it and put a new one in, and never had the problem again.

[Mike Voth]

Originally Posted by Stephen & Horace Johnson

I had the same issue on my 5speed mustang, it would vibrate so bad that it would jump out of gear as soon as i pulled into gear. It was my mainshaft that was bent. I took it to work and put it on jig and realize it was bent!!! I junked it and put a new one in, and never had the problem again.

Got the tranny out last night. After it's apart tonight, we'll set the main shaft up on "V" blocks just to see if there is an obvious bend. If not, it's going in to get checked tomorrow. Thanks, Adger.

[Jeff Lee]

Originally Posted by Mike Voth

The Monte has developed a very bad vibration in high gear. Changed driveshafts and the problem seemed to lessen temporarily, but it's back as bad as before. The driveshaft is straight. Dad can barely hold the shifter back in 4th as he crosses the finish line. We are taking the tranny apart to see if the mainshaft is bent or ???. Can a ring gear be out of balance? We are sending the clutch and disk away to get balanced. Axles ???.

Any help would be appreciated as we're really scratching our heads on this one.

Many thanks in advance!!

I bought an aluminum driveshaft with the trans yoke still attached and put it in my car. It came out of another Jerico equipped AMX and we both had Dana 60 rears so I figured it would be an easy swap.
The new shaft / trans yoke did not engage as far as my old driveshaft. I thought it wasn't a big deal, maybe 1/4" shorter than before.
That thing shook the car so bad when I pulled it out of my driveway I couldn't believe it. Then I tried to load the car on the trailer. I never got above 5 MPH and it sounded like the car was going to fall apart. I changed back to the MW CM driveshaft in the street as I didn't want to put it in gear and move it again. Took care of the problem.
Something to think about...

[Jeff Stout]

Had a rifle drilled axle bent in housing. It was twisted and curved half way down axle. Low speed was noticable but top end it was bad.

[Mike Voth]

Two things:

1. Found out that the pressure plate was balanced without the disc in place. In doing so, the floater can move around causing this inbalance and also, adding weight to the pressure plate where it was added is a no-no. Clutch is going back to Hyatt to get fixed.

2. Took the rears to get high speed balanced, and the results were not good! We have egg shaped slicks that were produced in 2001, and we just bought them!!

As John Force would say..."Bottom line is..." we may not have found the problem yet. The search continues...

[Dyno]

Where did you buy "new" 9 year old tires? Send them back. Dyno

[Jeff Lee]

Shelf life on slicks is 3 years...may vary by manufacturer but that's approximate. I always make sure I'm getting the freshest sets available.
Find out what your mfg says about shelf life and demand a new set from the vendor you bought them from.

And do get that clutch fixed by Hyatt!