Date:         Thu, 1 Jan 2009 15:33:43 -0800
Reply-To:     David Marshall <mailinglist@FASTFORWARD.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Marshall <mailinglist@FASTFORWARD.CA>
Subject:      What is the correct way to determine CV axle length?
Comments: To: Syncro@yahoogroups.com
Content-Type: text/plain; charset="iso-8859-1"

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I am in the process of (re)building the
rear drive shaft for my LT 4x4 Volksmogen project.  What is the correct
way to determine how long I need to make an axle shaft between two
CVs.
For those who are not familiar with the
project, I installed some Unimog u900 axles on my LT 4x4.  The issue is
that I have a compound angle needed for the rear drive shaft.  Originally
we used a single universal at the rear and a double universal at the front
(thus making a CV) but at any speed over 2000 rpm it vibrated like crazy
as we were running too much of an angle.
So, in my scrap pile was a rear
differential form an Audi 5000S quattro that uses 108mm CVs.  I remove
those drive flanges, which by the way will not bolt on to a Vanagon front
diff or gear box in case you were wondering what I was wondering and had
them modified to fit the transfer case and rear pinion of my Volksmogen
project.  Porsche 930 CVs are said to run at up to 25 degrees which is a
greater angle that what I need.  Real CVs as opposed to two universals
stacked also makes a much smaller unit so the overall length of the drive
shaft will be longer making the angles less &ndash; again a win situation
for me.  The price of a Porsche 930 CV is a lot less than the Spicer
universals I was running &ndash; in the case of a field repair, six bolts
and a circlip is all that is needed to replace one.  Really for me a
winning situation.
Also, are Audi 5000S quattro CV boots going
to work with Porsche 930 CVs? 

Most of this project can be seen at http://hasenwerk.ca/1993lt4x4


David Marshall
VW Adventure Driver and BMW Adventure Rider
 
http://www.hasenwerk.ca