alpinemauve Posted May 31, 2011 Share Posted May 31, 2011 My diff has the number 509703 handpainted on the mounting plate. Does anyone have a reference to this number and the ratio the diff then has? Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 31, 2011 Share Posted May 31, 2011 rear this ,daves method from canley's esaier than me writing it down.http://www.canleyclassics.com/?xhtml=xhtml/infodatabase/diff.html&xsl=infodatabase.xslcant trace the part number from my recordsPete Link to comment Share on other sites More sharing options...
heraldcoupe Posted May 31, 2011 Share Posted May 31, 2011 I've had a cursory look through the early lists and that number doesn't show up. Is it a Mk1 or Mk2 mounting plate? Cheers,Bill. Link to comment Share on other sites More sharing options...
alpinemauve Posted May 31, 2011 Author Share Posted May 31, 2011 The diff number I have should be either 507929 or 508654 for the diff complete and 205368 for the plate itself. But I have no reference to the 509703 figure. Link to comment Share on other sites More sharing options...
JensH Posted May 31, 2011 Share Posted May 31, 2011 Is it me or is your diff lacking the "cups" at the front mountings?The one I found on my spitfire mk 3 didn't have these - and they didn't look like being cut off?/Jens Link to comment Share on other sites More sharing options...
heraldcoupe Posted May 31, 2011 Share Posted May 31, 2011 JensH wrote:Is it me or is your diff lacking the "cups" at the front mountings?That's the primary difference between Mk1 and Mk2 diff mounting plates, no cups on the Mk1.Cheers,Bill. Link to comment Share on other sites More sharing options...
JensH Posted June 1, 2011 Share Posted June 1, 2011 heraldcoupe wrote:That's the primary difference between Mk1 and Mk2 diff mounting plates, no cups on the Mk1.Cheers,Bill.oh - didn't know that - is there any other differences from a later "normal" 4.11? Using it in my mk 3 spitfire now! Link to comment Share on other sites More sharing options...
heraldcoupe Posted June 1, 2011 Share Posted June 1, 2011 JensH wrote:oh - didn't know that - is there any other differences from a later "normal" 4.11? Using it in my mk 3 spitfire now!The Mk1 diff uses shorter mounting rubbers to the Mk2, when used in it's intended application. The cups would have made location more positive, and I'm uncertain of the relative heights of the front mountings. Cheers,Bill. Link to comment Share on other sites More sharing options...
herald948 Posted June 1, 2011 Share Posted June 1, 2011 JensH wrote:oh - didn't know that - is there any other differences from a later "normal" 4.11? Using it in my mk 3 spitfire now!The differential in the Mk3 Spitfire also had heavier-duty inner axles, although virtually nothing changed externally (still used the small flanges all around). Link to comment Share on other sites More sharing options...
heraldcoupe Posted June 1, 2011 Share Posted June 1, 2011 herald948 wrote:The differential in the Mk3 Spitfire also had heavier-duty inner axles, although virtually nothing changed externally (still used the small flanges all around).The earliest Mk3s had the thin shafts, there is a change point noted in the parts list. Not a good idea to rely on them though, they were upgraded for good reason....Cheers,Bill. Link to comment Share on other sites More sharing options...
Casper Posted June 1, 2011 Share Posted June 1, 2011 Quote:change pointGA237600GB57202FC12000 (those are the diff numbers)Don't know about the HB (Vit 1600)C. Link to comment Share on other sites More sharing options...
herald948 Posted June 2, 2011 Share Posted June 2, 2011 1337 wrote:GA237600GB57202FC12000 (those are the diff numbers)Don't know about the HB (Vit 1600)C.One source I found cites the change at Mk3 COMMISSION number FD22570. I think the number you quote above is missing a digit and should be FC120000, it being a differential serial number (series continued from the original Spitfire, hence the FC prefix). Link to comment Share on other sites More sharing options...
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