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Date:         Mon, 19 Sep 2005 07:54:35 -0400
Reply-To:     dhaynes@OPTONLINE.NET
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject:      Re: [Syncro] How do you tell if you have 4.86 or 5.43
              differentials?
Comments: To: David Marshall <mailinglist@fastforward.ca>
Comments: cc: Mailing List - Syncro <syncro@yahoogroups.com>
In-Reply-To:  <AIEFIGCNNANNIHLNFBPEMEJJAOAB.mailinglist@fastforward.ca>
Content-type: text/plain; charset=us-ascii

If one wheel is locked, the action of the differential will double the speed of the free wheel. This is why it can be dangerous to spin tires at speed such as when stuck in snow. With one wheel spinning, if the speedo says 50, the one tire is actually spinning at 100. Keep this in mind when spinning tires with a vehicle lifted. Any way, with only one axle turning, 2.4 turns =4.8 ratio. You got the 4.86 gears.

Dennis

----- Original Message ----- From: David Marshall <mailinglist@fastforward.ca> Date: Monday, September 19, 2005 1:55 am Subject: [Syncro] How do you tell if you have 4.86 or 5.43 differentials?

> Volks, > As a result of my transmission failure... not my month to say the > least but > hey... I need to install a new transmission in my camper. > > The tires are 215/85R16 - circa 30.3" tall > > With a GPS reading 100km/h, the tachometer says 3050 rpm in 4th > > The transmission is an AAN which is supposed to be 4.86:1 - same > as any > north American gearbox > > Both the transmission and front differential were rebuilt in 2000 > in Germany > so who knows what has been done to them R+P wise. > > Plugging these numbers into a calculator, this should result in > (with a 0.85 > 4th) 2840 rpm and not 3050. If you put 5.43:1 in the calculator, it > results in almost 3200 RPM. > > So, I figured I could tell by putting the van in 2WD (via > decoupler) and > lifting a front wheel and count how many times the drive shaft > turns when > you turn the wheel once. less that 5 means a 4.86 and more than > 5 is a > 5.43 right??? nope... I get about 2.4 turns of the drive shaft. > Now... in > my garage I have a 4.86:1 front diff... same test (hold one flange > whileturning the other) results in about 2.4 turns of the drive > shaft flange.... > what gives? Without lifting the vehicle totally off the ground > and locking > all differentials and giving the wheels a revolution by hand, how > are you > supposed to tell? > > The last thing I want to do is install my spare AAN in there and > have it > breaking because the front R+P doesn't match. > David Marshall > > Fast Forward Automotive Inc. > 4356 Quesnel-Hixon Road > Quesnel BC Canada V2J 6Z3 > > Internet: www.fastforward.ca Email: sales@fastforward.ca > Phone: (250) 992 7775 > > - Vanagon Engine Conversions and Accessories > - Vanagon, Transporter and Iltis Sales and Importation > - Electrical harness fabrication and customization > > Due to the large volume of email we receive, PLEASE include > previousemails when responding. > This will allow us to read the complete dialogue in one message > and will > result in quicker and more accurate responses. > > > > [Non-text portions of this message have been removed] > > > > If you would like to modify your subscription settings (including > unsubscribing), visit: > http://groups.yahoo.com/group/Syncro > Please remember that rude or offensive language is not allowed on > the Syncro list. Please try your best to resolve differences > privately and keep them off the list. > > > > > > > > > > > > > > > Yahoo! Groups Links > > <*> To visit your group on the web, go to: > http://groups.yahoo.com/group/Syncro/ > > <*> To unsubscribe from this group, send an email to: > Syncro-unsubscribe@yahoogroups.com > > <*> Your use of Yahoo! Groups is subject to: > http://docs.yahoo.com/info/terms/ > > > >


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