ahebron Posted January 14, 2017 Share Posted January 14, 2017 Like most of us I have collection of various Triumph bits cluttering my workshop shelves.Now I have started to work on my Vitesse I dug out several Dolomite/Toledo 3.89 diff heads and a couple of 4.11 Herald diffs of various description plus a Vitesse/GT6 3.89 diff head with a broken crown wheel.Obviously the 3.89 Vit/GT6 unit can be rebuilt using the Dol/Tol 3.89 diffs but what is involved in converting the Herald 4.11 to 3.89 using the Dol/Tol units.I am assuming that I would be best to use a 13/60 4.11 as a start with its bigger half shafts.Engineers and machinists are not a problem to get work done.ThanksAdrian Quote Link to comment Share on other sites More sharing options...
glang Posted January 14, 2017 Share Posted January 14, 2017 does this page help:http://www.teglerizer.com/triumphstuff/spit_and_gt6_specs.htm Quote Link to comment Share on other sites More sharing options...
ahebron Posted January 14, 2017 Author Share Posted January 14, 2017 Quoted from glang does this page help:http://www.teglerizer.com/triumphstuff/spit_and_gt6_specs.htm I certainly hope so.ThanksAdrian Quote Link to comment Share on other sites More sharing options...
Matt306 Posted January 14, 2017 Share Posted January 14, 2017 Half shaft flange and prop flanges need to be changed aswell. And the bolts are a size bigger too. Quote Link to comment Share on other sites More sharing options...
herald948 Posted January 14, 2017 Share Posted January 14, 2017 Quoted from Matt306 Half shaft flange and prop flanges need to be changed aswell. And the bolts are a size bigger too. But wouldn't the 13/60 4.11, even with the larger shafts, still have the smaller flanges? Quote Link to comment Share on other sites More sharing options...
Matt306 Posted January 14, 2017 Share Posted January 14, 2017 I went from 4.11 to 3.89 on a herald 13/60 and had to change the flanges. Your 4.11 could be different Quote Link to comment Share on other sites More sharing options...
RobPearce Posted January 14, 2017 Share Posted January 14, 2017 The 13/60 diff has the smaller flanges but the larger splines. If you're rebuilding a Dolomite diff into a 13/60 rear casing, you'll re-use the 13/60 output stub shafts, and get the small flanges. If you fit a 3.89 diff from one of the other small chassis cars (Vitesse, GT6, Spitfire MkIV) it will have larger flanges. Quote Link to comment Share on other sites More sharing options...
ahebron Posted May 14, 2017 Author Share Posted May 14, 2017 I took my bins of complete Herald diffs and Toledo/Dolomite CWPs to my engineer and he built me up two complete 3.89, one 3.89 CWP nose piece and a complete 4.11.My 4.11 diffs needed to be machined to accept the 3.89 parts and we had a pile of parts for the scrap bin left over.I am happy.Adrian Quote Link to comment Share on other sites More sharing options...
Antonnick Posted May 15, 2017 Share Posted May 15, 2017 Quoted from Matt306 I went from 4.11 to 3.89 on a herald 13/60 and had to change the flanges. Your 4.11 could be different When you made this, did you Change the flange(s) on the diff itself or on the propshaft/ half shafts? Quote Link to comment Share on other sites More sharing options...
RobPearce Posted May 15, 2017 Share Posted May 15, 2017 When I fitted a 3.63 to a 13/60 we swapped the stub axles in the diff itself, thus retaining the small flanges. I believe this is not possible with earlier (1200) diffs. The alternative is to swap the flanges on the half-shafts (with new UJs). Quote Link to comment Share on other sites More sharing options...
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