Gear Vendors comes through, BIG TIME

[RECHRGD]

For those of you that don't know, I've been having a vibration problem for over two years, ever since installing a GV unit in my '68.  Without going into any details, let's just say that I tried everything in the book with the help of the GV techs and my brothers here at DC.com.  Today, the president of GV (Rick) calls me to say that they are sending out a complete new unit.  This is happening even though it has yet to be concluded that the GV unit is my problem.  Great customer service, great company!   :2thumbs:Bob

[The70RT]

Great Bob

[Sublime/Sixpack]

Now lets hope this resolves your problem.

[Just 6T9 CHGR]

Definitely gonna watch this one!

[TylerCharger69]

 

[bull]

Wow, that's stepping up. Did he find out we were talking about the issue here? At any rate, I hope this solves your vibration issue.

[1Bad70Charger]

Wow, that's stepping up. Did he find out we were talking about the issue here? At any rate, I hope this solves your vibration issue.

FANTASTIC incredible service, that's what makes or breaks a company, best of luck! 

[Rolling_Thunder]

what happens to the old one ?  I know someone looking for one    haha   

[68X426]

Great to hear that they back up the product. I have a GV. No problems, but would like to hear about your successful fix.

[b5blue]

Awesome news!  After all you have been through you deserve a break! Hurray for Gear Vendors! Keep us posted and Good Luck!

[firefighter3931]

That's good news Bob !  You've done more than most would have to isolate the problem so it makes sense that they would want to keep you happy. Not every company would do that so they deserve some Kudo's 

Lets hope for a positive resolution...and keep us posted. 



Ron

[tan top]

thats great ! Bob   looking forward to see what happens 

 

[200MPH]

Thats great  FF and TT  are right.thats is awesome !

[TCB09RT]

Good move on GV's part.
Best thing they can do for their brand image is to keepcurrent customers happy and keep them saying positive things about GV to potential customers.

[Musicman]

 

[RECHRGD]

OK, The new unit arrived yesterday PM.    Rick made sure that the coupler was a tight fit, and it is.  I'll get to it probably this weekend and am keeping my fingers crossed.  Bob

[mauve66]

soooo, if it comes back we have to start looking at everything again....... think positive dammit

[RECHRGD]

Well, I got it installed yesterday and I'm right back to square one.    Same vibration, same speed.    I have to walk away from this for a couple of days.  I'll be in touch with GV after I do some more tests.  They are still very supportive and want to get this thing solved.  The only thing other than the GV unit that went back on the car yesterday was the driveshaft (#2).  If the problem is not there, then there has to be something goofy going on with the car that is being magnified by having forty extra pounds hanging off the end of the tranny.  Bob

[firefighter3931]

Dang that's got to be frustrating ! 

Bob, i'm wondering how far your slip yoke engages into the tail housing ? Are you using 7290 u-joints & slip yoke ? How did you measure for driveshaft length ?

If there is too much yoke hanging out behind the tailshaft it can cause vibration issues. The proper way to size the driveshaft is to intall the yoke, push it all the way in until it bottoms out....then pull it back 1in. From there you measure center to center on the front & Back yokes for the driveshaft length.

If the driveshaft is too short the yoke will be out too far. Can you post a pic of the front yoke & driveshaft installed in the car with the suspension loaded ? Maybe undo the rear straps and try sliding the yoke forward to see how much it moves inwards....



Ron

[RECHRGD]

Dang that's got to be frustrating ! 

Bob, i'm wondering how far your slip yoke engages into the tail housing ? Are you using 7290 u-joints & slip yoke ? How did you measure for driveshaft length ?

If there is too much yoke hanging out behind the tailshaft it can cause vibration issues. The proper way to size the driveshaft is to intall the yoke, push it all the way in until it bottoms out....then pull it back 1in. From there you measure center to center on the front & Back yokes for the driveshaft length.

If the driveshaft is too short the yoke will be out too far. Can you post a pic of the front yoke & driveshaft installed in the car with the suspension loaded ? Maybe undo the rear straps and try sliding the yoke forward to see how much it moves inwards....



Ron

Thanks Ron.  The driveshaft length is dead-on what GV wants to see with only 5/8" of play at the tail.  Yes the u-joints are the 7290 units.  Bob

[tan top]

oh crikey after all that still the same   damn ..  thats anoying  as its not as if you can see what the fault is  

at least you know what its not now after all this dismantling & re fitting
 

[firefighter3931]

Dang that's got to be frustrating ! 

Bob, i'm wondering how far your slip yoke engages into the tail housing ? Are you using 7290 u-joints & slip yoke ? How did you measure for driveshaft length ?

If there is too much yoke hanging out behind the tailshaft it can cause vibration issues. The proper way to size the driveshaft is to intall the yoke, push it all the way in until it bottoms out....then pull it back 1in. From there you measure center to center on the front & Back yokes for the driveshaft length.

If the driveshaft is too short the yoke will be out too far. Can you post a pic of the front yoke & driveshaft installed in the car with the suspension loaded ? Maybe undo the rear straps and try sliding the yoke forward to see how much it moves inwards....



Ron

Thanks Ron.  The driveshaft length is dead-on what GV wants to see with only 5/8" of play at the tail.  Yes the u-joints are the 7290 units.  Bob

OK Sounds like the yoke engagement is fine.

How snug does the yoke feel in the tailshaft...any side to side or up & down movement. Is this a new yoke or a used factory piece ? With stock transmissions that have worn tailshaft bushings and/or slip yokes this can be a problem.

What does the level of the tailshaft look like with the driveshaft installed. Is it pointed up or down...or does it sit level ? Just wondering if there is some wierd driveshaft angle with the GV unit installed ?

I'm going to assume that the new driveshaft was balanced and checked for runout ?

Other than that i can't come up with anything...wish i could be of more help 



Ron

[elacruze]

 

Yep gonna have to do some math before this is over.

Did the same shop balance all your driveshafts? I know that not all of them balance at high speed (7000rpm or so) so you may ask about that. If your shafts have all been made/balanced at the same shop, have them checked/balanced at a different shop (different machines).
Is your transmission mount rubber or urethane? Maybe try swapping out for the other compound to change resonance.

It would be very helpful to know the frequency of the vibration vs. engine RPM. I used to have a little device for discovering frequency which had a spool of wire like a tape measure, and the extended wire would vibrate with the frequency when you pulled out the right length. The point is to determine whether the vibration is in front of the GV or behind it, and seat-of-the-pants guessing may not be able to tell the relatively small difference.
To this end, you may also be able to select a different gear in front of the GV, and see if the vibration comes at the same road speed. That would discover whether it's RPM or road speed mechanisms.

Eric

[RECHRGD]

Thanks guys!  I will definitely have the driveshaft checked by a different shop.  I had the original and the latest one built by the same shop.  He checked and rechecked with the yoke on and all was good.  He has the best reputation in town, but who knows, something could be a bit off with his equipment.  I reconfirmed yesterday that it is speed related, not rpm related.  The vibration comes in at the same speed whether in overdrive or not.  Bob

[b5blue]

I am "bummed out" for you!