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Old 06-07-2013, 09:48 PM   #1
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Driveshaft Issue?

So I had a driveshaft shop carbon fiber ds installed a couple weeks ago no problems, got the car lowered yesterday no problems at all. Went to get an alignment at ford today and all of the sudden the car is vibrating a lot! From what I have read up a fast pulsating vibration would seem to indicate possibly the driveshaft and that this can be remedied by rotating the shaft at the rear yoke by 180 degrees. I'm taking it back by ford in the morning to get them to look and fix the problem since there was nothing before but wanted to see if anyone else had any insight etc thanks guys
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Old 06-07-2013, 09:56 PM   #2
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Originally Posted by kornflake7 View Post
So I had a driveshaft shop carbon fiber ds installed a couple weeks ago no problems, got the car lowered yesterday no problems at all. Went to get an alignment at ford today and all of the sudden the car is vibrating a lot! From what I have read up a fast pulsating vibration would seem to indicate possibly the driveshaft and that this can be remedied by rotating the shaft at the rear yoke by 180 degrees. I'm taking it back by ford in the morning to get them to look and fix the problem since there was nothing before but wanted to see if anyone else had any insight etc thanks guys
when you lowered the car do you do an adjustable UCA?
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Old 06-07-2013, 09:59 PM   #3
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I have a bmr uca w/mount, bmr lca. I have yet to put on the relo brackets, but curious on why yesterday it was fine driving lowered and then after an alignment it's all whack

---------- Post added at 09:59 PM ---------- Previous post was at 09:58 PM ----------

I have a bmr uca with mount and bmr lca waiting to put on relo brackets, just curious on why yesterday while lowered and driving more than 50 miles no problems then an alignment and its so out of whack
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Old 06-07-2013, 10:00 PM   #4
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Originally Posted by kornflake7 View Post
I have a bmr uca w/mount, bmr lca. I have yet to put on the relo brackets, but curious on why yesterday it was fine driving lowered and then after an alignment it's all whack
Well did they by any chance change the UCA at all for the alignment? Could it just be coincidence? Also what is your pinion angle?

I also had my UCA come loose and shift before I got it set correctly. this didn't happen?
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Old 06-07-2013, 10:02 PM   #5
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I have no clue if they did but all my stuff is within spec according to the sheet, it's a driveshaft shop so not supposed to have to mess with pinion angle even on dropped cars. If it makes any difference I dropped the car with eibach sportlines. I'm hoping it's just simple as rotating the driveshaft 180 and that's it.
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Old 06-07-2013, 10:04 PM   #6
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I have no clue if they did but all my stuff is within spec according to the sheet, it's a driveshaft shop so not supposed to have to mess with pinion angle even on dropped cars. If it makes any difference I dropped the car with eibach sportlines. I'm hoping it's just simple as rotating the driveshaft 180 and that's it.
you still have to have a correctly set pinion angle though. Did you ever set your pinion angle? I was lowered a lot but my stock pinion angle after dropping was near +2 and after getting it set properly sits at -2.

Should be -1 to -2 for autos and -2 to -3 for manuals. If you don't have this set correctly it is more than likely where your vibrations are coming from.

FYI this won't show up on an alignment rack. Has to be measured under the car on the drive shaft itself.
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Old 06-07-2013, 10:12 PM   #7
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Well the car wasn't lowered when I got it put on so it didn't matter I"m sure, I was more curious on why it ran fine for a day and then all of the sudden today started vibrating. Hopefully they will fix it if I take it back in the morning we shall see. I just saw that on the dss site is says there is no need to change pinion angle on lowered cars, due to the cv that they have.
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Old 06-07-2013, 10:15 PM   #8
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Quote:
Originally Posted by kornflake7 View Post
I have no clue if they did but all my stuff is within spec according to the sheet, it's a driveshaft shop so not supposed to have to mess with pinion angle even on dropped cars. If it makes any difference I dropped the car with eibach sportlines. I'm hoping it's just simple as rotating the driveshaft 180 and that's it.
For the aluminum driveshaft, DSS recommends having a cv joint length of 3 5/8" which can be changed by shortening or lengthening the adjustable uca. Not sure if the cf one is the same.

Also, when clocking you want to clock the trans side of the driveshaft, not the differential side. You could try clocking 90* at a time and test driving in between each, but I imagine that could quickly become expensive at a dealer. Clocking 180* may be enough for you though. I clocked mine 90* and it seemed to get rid of most of the vibration, I think the rest of the vibration is being caused by an incorrect cv joint length. I still need to get it adjusted
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Old 06-07-2013, 10:18 PM   #9
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Ya I just read on the site it said to clock it 180 and should fix it which if the dealer doesn't wanna help me out I will do myself.
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Old 06-08-2013, 02:53 AM   #10
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Sounds fishy. My suggestion is to check the gap that was mentioned previously. That could have got affected when you lowered the car, and you should be able to adjust it w/ the adjustable uca. Pinion angle really isnt important w/ the DSS, but if you do set it....Make sure you take your measurements w/ the car tires loaded on ramps or a drive-on lift and you have to take off the DS to get an accurate measurement.
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Old 06-08-2013, 08:52 AM   #11
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Whatever you do dont let the dealer get a hold of your car. Do the 180 degree rotate if that don't work set the drive shaft to dss's requirement!
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Old 06-08-2013, 10:40 AM   #12
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I got it installed by a shop that specializes in mustangs etc high hp cars, just gonna take it by there on monday and let them sort it out since they installed it.
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Old 06-08-2013, 09:30 PM   #13
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I got it installed by a shop that specializes in mustangs etc high hp cars, just gonna take it by there on monday and let them sort it out since they installed it.
Good idea ....they will fix it!
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