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RE: Overdirve Diff in a Mk3 Spit??

To: Chris and Karen Prugh <prubrew@ix.netcom.com>, "'Triumph List'" <triumphs@autox.team.net>
Subject: RE: Overdirve Diff in a Mk3 Spit??
From: Andrew Mace <amace@unix2.nysed.gov>
Date: Tue, 25 Jun 1996 10:03:46 -0400 (EDT)
On Tue, 25 Jun 1996, Andrew Mace wrote:

> The manufacture date of January 1972 would imply that the car was fitted 
> with the 4.11:1 diff. It would be best, though, to count revolutions to 
> be sure one way or the other. Just mark a wheel and the driveshaft and 
> see how many turns it takes the driveshaft to turn one wheel a full 
> revolution (with the other wheel held still). Just under 4=3.89:1; just 
> OVER 4=4.11:1. Over 5 turns=contact me. I'm always interested in rare 
> Herald options! ;-)

Oh, one more thing, thanks to John Kipping's wonderful catalogue. It 
would appear that most diffs with the FH prefix were 3.89:1, and those 
with the FK prefix were 4.11:1. Of course, gears could have been swapped 
in/out, so a counting test is still recommended.

--Andy

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  * Andrew Mace                         e-mail: amace@unix2.nysed.gov *
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  * Mrs Irrelevant: Oh, is it a jet?                                  *
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  *  Triumph Herald engine with wings.                                *
  *   -- The Cut-price Airline Sketch, Monty Python's Flying Circus   *
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