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The Sycro Driveshaft
Introduction
The Syncro center driveshaft or Prop-shaft (located between the transaxle and the front differential) has a limited life span. Failures are not uncommon at the 100, generic cialis there 000 mile mark. The U-joints have sealed needle-bearings with no provision for lubrication. When the joints begin to develop flat or rough spots as they wear, cialis generic buy vibration in the drive line often results. VW does sell a rebuilt shaft. However, purchase the price is about $600-$800, depending where you get it.
Syncro owners have tried various ways to avoid spending the money on a new or rebuilt drive shaft, including having a custom shaft made and attempting to rebuild the stock shaft. Those who have gone this route have had mixed success. It seems that at least half of the attempts result in shafts that still cause vibrations. There are several theories as to why the rebuilds have not worked. They include 1) use of wrong U-joints, 2) failure to replace (or use on a custom made shaft) the rubber flex disk and 3) a worn internal bearing (the end of the shaft with the rubber flex disk has allen bolts, and inside that end there is an internal shaft that extends about 6″ into the outer casing of the shaft and rides on a bronze bearing that apparently can wear out and possibly cause vibration).
The first two suspected causes of vibrations after a rebuild have been addressed by use of stock VW replacement parts. Although the VW u-joints cost a bit more than some of the others available, they are still reasonable in price relative to the cost of a new shaft. The third possible cause of vibrations after a rebuild, a worn ” inner bearing,” was only recently discovered by Mark Rokus. There has not been enough feedback from other syncro owners to determine whether these internal bearings typically wear out or are in fact the source of the problem. Thus, it may be worthwhile to disassemble a shaft and check on the condition of the internal O-rings, grease and bronze bearing before deciding whether to attempt a rebuild.
Details for rebuilding your stock shaft or obtaining a rebuilt VW shaft or a custom shaft are listed below.
Rebuilding the Stock Prop-Shaft
The rebuild process itself is relatively straightforward. 1) Obtain new u-joints and flex disk, 2) install them or have a drive line shop install them, 3) have the shaft balanced at a competent drive line shop.
Parts Needed:
VW U-Joints: 251 521 000 (~$160)
[Alternativeu-joints: NEAPCO 1-0321 (~$30)]
VW Flex Disk: 251 521 001 ( ~$40) [BMW manual transmission disk from 1970 to 1980 will also work
Part Number 26111106113 (~$40)].
Service Needed:
Balancing by drive line shop (~$80) [Some have had success without having the shaft balanced.]
Total cost: $70 – $280+, depending on parts used and whether you do the work or have a shop do it. Savings over rebuilt VW shaft: $320 – $530.
It is probably advisable to have an experienced drive line shop do the rebuild unless you have the necessary tools and competence to do it yourself
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Custom Made Shaft
Shop-Modified Shaft
Another
Syncro owner reports finding a shop that employs a technique that seems
to skirt the re-balancing problem: they cut the entire U-Joint off the
of the shaft and weld new ones on, then re-balance. His report is
below:
