Rennlist - Porsche Discussion Forums - DIY - Cayenne (955/957) https://rennlist.com/forums/ en Sat, 18 Apr 2026 22:16:10 GMT vBulletin 60 https://rennlist.com/forums/images/misc/rss.jpg Rennlist - Porsche Discussion Forums - DIY - Cayenne (955/957) https://rennlist.com/forums/ Cardan shaft support fix with JXB support https://rennlist.com/forums/diy-cayenne-955-957/1509208-cardan-shaft-support-fix-with-jxb-support-new-post.html Sun, 12 Apr 2026 00:06:55 GMT Similar procedure to the Jimifix method. I opted to spend the $300.- for the JXB support. Jimi fix much cheaper but takes longer and could need some tweaking if not done right from what I read on... Similar procedure to the Jimifix method. I opted to spend the $300.- for the JXB support. Jimi fix much cheaper but takes longer and could need some tweaking if not done right from what I read on other posts here.

After finishing the job I still believe replacing the shaft with an aftermarket Aluminum or Carbon fiber shaft using CV joints on either end is the superior method. Cost mainly kept me from that route. These shafts take about 6 weeks from order date. Not that that mattered for me since this needed doing about 6 months ago already.

Tools I found useful:
Stubby open end wrenches
13mm
16mm
18mm
Socket wrench in short arm style, 13mm 16mm, 18mm
Universal drive for socket wrench
Impact wrench
Pry bar or long heavy screwdriver
Razor blade or box cutter blade
Disc grinder or other small saw to cut old bushing housing.



Support bracket comes off fairly easy.
My rubber bushing was pretty much finished. No contact between inner and outer parts of rubber.
I used a 4" disc grinder to cut through metal outer part of support. Two cuts are needed then it can be pulled down and off the shaft. I used a vice grip to hold it steady while cutting. I clamped it on an angle to part of car frame where it normally attaches.



Since I did not purchase a new support bracket from JXB (another $100) I had to lower the driveshaft to have access to the nuts for new support bushing. JXB video instructions show seemingly simple procedure for dropping shaft. Ohhh were it true would have been a much quicker job for me.
First of all the video shows a car with no exhaust in the way! The video also does not show how much the shaft must be pried back to disengage. There is a small shaft extension for locating I assume with the rubber guibo thing. It extends about about 3/4" into the guibo. The rubber on guibo also sticks and needs some healthy persuasion to loosen enough to pull it away. See video attached at end of this post. Shows how driveshaft must be shaken to get front guibo loose from trans output shaft flange. Note there are small bosses on each bolt hole sleeve in guibo which extend into flange about 1/8".



Since the bracket was quite rusty I figured it should be painted while it's off.



Old and new support bushing

The new support comes apart in middle so you re-assemble on the hanging shaft and attach old bracket to new support while hanging. Problem again is shaft does not really come down enough with exhaust pipe in the way. Looks easier in JXB video than it really is






There is no way to tighten bolts from the bottom of bracket since the bolts have flats on the shanks that prevent turning while engaged in the slots of bracket. Also there is no way to know correct position in slots since you must tighten before you put bracket back up and shaft back in place.


I had to place transmission in neutral to rotate flange from transmission slightly. It must have been under load and moved once I removed shaft.
Note positions of flat washers. Always place flat washer against rubber guibo. So alternate one under head where hex head is against rubber and one washer under nut where it touches rubber



I only lightly snugged up bolts on support bracket then jacked up wheels in neutral to be able to turn drive shaft using my foot to push on a wheel while jiggling the support bracket to let it find center as best it could. Then tightened up bolts.




Test drive, no mad midget anymore. All seems in order.
Overall a horsesh*t method for a driveshaft in my opinion.

Attached Files
]]> DIY - Cayenne (955/957) PepperLuv https://rennlist.com/forums/diy-cayenne-955-957/1509208-cardan-shaft-support-fix-with-jxb-support.html Come enjoy my poor financial decisions - 955 Turbo Build thread https://rennlist.com/forums/diy-cayenne-955-957/1506788-come-enjoy-my-poor-financial-decisions-955-turbo-build-thread-new-post.html Fri, 20 Mar 2026 16:21:55 GMT Wrong forum - whoops Wrong forum - whoops ]]> DIY - Cayenne (955/957) RideZX6R https://rennlist.com/forums/diy-cayenne-955-957/1506788-come-enjoy-my-poor-financial-decisions-955-turbo-build-thread.html