Thanks mates, so the u joint involved is normally not worn...just for my information, can I do anything to loosen it a little ??
Then i'll tell you why I worry about that : with this driveshaft fitted, I had directly some vibration from the rear end at 65/70MPH, increasing but i didn't go a lot faster...
I checked the ppf height, still vibrating, 4 wheel bearings are new, I changed 4 tires and precise balance, still vibrating etc etc. FYI my car has a full 6 point cage, quite stiff.
Then, I only removed this brand new drive shaft (only drive about 30/40 miles with, very quick "test" above 65mph), put back my "old but finally fine" OEM one (which has finally 4 u joint axis ok, free without hard point etc) and the vibration disappear directly, even at 100mph !
When swapping back the OEM driveshaft, I didn't touch anything else, anything.
Did the balance process check only the shaft with ujoint in line so without "working" alternatively finally, or is it free/show also a ujoint failure/misalignement ?! Its an unusual issue so i try to diagnostic a little more...
Nice try, but FYI Emilio, the "OEM shaft which has to be marked to match the diff accordingly to the workshop manual" has been fitted at least 5 times on 3 different diff than the original one, on random position every time and never vib'. So thats hard to justify all of this vibration of the other one supposed to be perfectly balanced by that...maybe that could minimise it, especially if the diff has also a little bad round, but you also know that this diff has been refurbished brand new with every bearing new etc. I dont want to destroy it because of any wrong balanced load, even its hard vibration or a little less.
the vibration issue is now solved with the old OEM one, which doesnt occur any vibration, either with random clock on random diff
The issue with this shimmy driveshaft is that the supplier is over atlantic (so huge shipping cost for and back and for, plus import fees etc) AND much less commercial/accomodating than i could have imagined...so I try to investigate by myself, in order to avoid an other bad surprise. If repair can done easily, i'll manage in a local way, better for everyone ;-)
I'll not use a 500$ drive shaft (yeap, incl. shipping and import...even more if considering repair or shipping back to supplier) as an art piece, i already have a sandblasted PPF for that !
Yeap, its a 5 yard joke for a useless drive shaft and will cost even more with shipping back (under my charge !!) or repair it locally...
I'm not an import/export specialist, but if the supplier finally refund me, i'll have paid for the local VAT (with custom fees) when import, but never get back that (because he want the part as a warranty return, value 0) ?!
Because i refurbished the whole drivetrain during the winter after a diff bearing issue and wasn't sure that the OEM driveshaft was still in good shape, just correct or starting to worn.
I cannot manage every upgrade on my car by myself, especially when I need a correct lift etc to swap the drivetrain, so the workshop did itself.
I know that this OEM driveshaft has previously took 10 years of 13psi boost and hard tracked so I was expecting to avoid any later failure by putting some money on a well balanced new shaft with fresh u joint...but that was the opposite finally
That's the problem between preventive and currative maintenance, wait for the failure and dont drive the car for a while, or anticipate what can fail and refresh all that can be when it's possible to do/regroup with failure repair !
I am having the same issue with my non-oem driveshaft I just installed.
I noticed in the FSM it mentions clocking the stock driveshaft so that the sticker is aligned with the casting mark, I'll try clocking this one in other orientations as well. I may try re-checking the PPF alignment as well.
If I can't figure it out, I'll just drop the stock one back in for the time being. It has a couple gritty spots in the u-joints, but doesn't have the vibration issue.
Edit: since my non-oem driveshaft has zerks for grease, I'll try adding some grease just in case that was forgotten by the manufacturer, but I personally don't think this will help.
Last edited by Dustin1824; 06-09-2016 at 12:17 PM.