Roger Posted March 4 Report Share Posted March 4 I need some advice from the brain thrust again… I noticed that new ”Stanpart” crown wheels and pinions are available. Not sure if this is a new thing or if they have been available for a long time? I have been trying to source a 3,63:1 Spitfire 1500 diff for my Vitesse in Sweden for a long time, but no joy. As some of you might know by now, shipping costs are an issue for me when buying second hand parts. It’s a long way to the Åland Island. I have two diffs in my possession. One 4,11:1 from my 1969 13/60 and one 3,89:1 in my 1966 Vitesse. Would it be possible to convert my 4,11 Herald diff to 3,63:1 by ordering the ”Stanpart” 3,63 pinion and gear? These parts are expensive, it would be frustrating to order them and later find out that they do not fit in my 13/60 differential. Link to comment Share on other sites More sharing options...
johny Posted March 4 Report Share Posted March 4 One problem I can see straight away is that the splines are different. For cost savings Triumph later went to rolled fine splines for many drives (gearbox, clutch and diff) in place of machined ones. This means you would need the later coupling however I have a feeling theres other issues as well.... 1 Link to comment Share on other sites More sharing options...
JumpingFrog Posted March 4 Report Share Posted March 4 (edited) There are two different diameters of pinions, Herald, early Spitfire (pre Mk. IV) and Vitesse 1600 are smaller. As such the bores for the bearings in the front of the diff housing are also smaller. Converting the 3.89 will be possible, the 3.63 pinion will fit, but converting the 4.11 won't be easily possible without machining the casing. Edited March 4 by JumpingFrog 1 Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 4 Report Share Posted March 4 and dont ignore the accurate dimensional mounting distance settings you need to have to correctly mesh and shims to preload the gear sets not for the faint hearted unless you want to make a real whiner Pete 1 Link to comment Share on other sites More sharing options...
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