928 Driveline Information - 928 drive shaft problems
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Drive Shaft Problems
We have many drive shafts coming in for rebuilds or being sent back as cores with damaged drive shafts. Below are a few pictures of different types of drive shaft problems and what to look for before sending in your 928 torque tube for rebuilding or as a core. We will not rebuild your torque tube with a damaged drive shaft due to warranty concerns. We will not refund your total core charge if the drive shaft is damaged.
The picture below shows damage to the rear splines of a 928 5 speed drive shaft rendering it unusable for a rebuild.
The picture below shows the engine end of two 928 5-speed drive shafts. The one on top has damaged splines and is unusable for a rebuild.
The picture below shows a 928 automatic drive shaft with damage to the shaft just after the splines. This damage was done when it was removed from the 928. Care should be taken when removing the torque tube from the car to not damage the torque tube or drive shafts.
28mm Drive Shaft Problems
The 28mm drive shafts have a propensity to shear at the necked down areas near the splines at each end. Below are a few pictures showing this problem. This failure happens while driving and is signaled by a loud metallic grinding noise under the car and the car no longer has forward or rearward movement in any gear. The top picture shows the sheared drive shaft through the rear torque tube access hole where one would loosen the rear pinch bolt. The bottom picture shows the end of the sheared drive shaft looking into the end of the torque tube.
Due to the shear failures of 28mm drive shafts, it is strongly advised that owners change their 28mm drive shafts with 25mm drive shafts during a torque tube rebuild. We have new enhanced performance 25mm automatic drive shafts which can be purchased for such a change out.