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Senior Member
Good post and good reminder. I've had communication with several builders about this issue. One of the variables appears to be differences in the driveshaft U-joint. At least two different versions have been supplied with FF kit driveshafts, with different flange thicknesses. Resulting in the supplied bolts being too long in some cases. May not be exactly what's happening with yours. But something to watch out for as well.
Personally, I'd recommend grinding a little off the end of yours vs. using a washer.
Build 1: Mk3 Roadster #5125. Sold 11/08/2014.
Build 2: Mk4 Roadster #7750. Sold 04/10/2017.
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Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020.
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Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020.
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Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023.
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There were or are 2 styles of drive shafts, one with a steel flange like you have and another with aluminum. The aluminum is thicker and longer bolts were sent out for it. Suspect you have the longer bolts for the aluminum flange drive shaft.
I ended up with 4 different drive shafts until they got the correct IRS and length one to me and I have had both styles. They also sent out a revised instruction with new bolt torque values by email.
David W
Mkll 4874 built in 2004
Gen 3 coupe #16 registered 2018 painted 2019