mpbarrett Posted July 16, 2013 Share Posted July 16, 2013 Anyone run a 1500 herald (ie spitfire engine) with O/D with a 3.63 diff instead of the normal 4.11 diff. Just wondering what its like on motorways and whether it noticeable kills the accerelation?Mine is on a 4.11 and I have a 3.63 to fit but would be interested in other experince before I fit it. This wont happen until the GT6 is back with a working gearbox (long saga....) or will be a rush job ready for the 10CR.mike Quote Link to comment Share on other sites More sharing options...
herald948 Posted July 17, 2013 Share Posted July 17, 2013 I would think that should be an acceptable combination, although it's possible that acceleration would indeed be a bit more leisurely that one might prefer. But I also think anything would be better than a 4.11:1, such as a 3.89:1! Quote Link to comment Share on other sites More sharing options...
marktheherald Posted July 17, 2013 Share Posted July 17, 2013 Yes, that's my combo. It does (did, SORN'ed for 2 years now :() struggle a bit on a long climb in o/d top, but I was more than happy with the reduced effort otherwise. I did have the 3.89 diff for a while and this may suit more 'spirited' driving. Quote Link to comment Share on other sites More sharing options...
Pete Arnold Posted July 17, 2013 Share Posted July 17, 2013 I used to have a 1200 Herald with 4.1 diff which went very well but I hankered after something with less noise and lower engine revs at "high speed". I now have a Vitesse with OD and 3.63 diff (ex 1500 Spitfire) and am well satisfied as I can now cruise quite happily at 70mph.OK acceleration may suffer a little but I'm not a boy racer; more like an old boy who likes to be able to cruise comfortably when traffic allows! Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted August 4, 2013 Share Posted August 4, 2013 Ran a 1500 Herald with a 3.89:1 and J type OD. That worked pretty well but I always felt it could pull a taller gear. Never got around to trying a 3.63 in that though. Original 4.11 was much too low - rarely used first!I'd be happy to try the 3.63. You do know it'll mean changing UJ flanges don't you? (as would a 3.89)Nick Quote Link to comment Share on other sites More sharing options...
herald65 Posted June 9, 2014 Share Posted June 9, 2014 Nick_Jones wrote: You do know it'll mean changing UJ flanges don't you? (as would a 3.89) NickI'm fitting my 1200 out with a spit 1500, j-type overdrive and spit diff. Will I need different drive shafts? How do I adapt the flanges? Spell it out for me. :P Quote Link to comment Share on other sites More sharing options...
Clive Posted June 9, 2014 Share Posted June 9, 2014 If you have a late 4.11 diff with the larger internal shafts, then you can just swap them over with the output shafts of a 3.63 diff. Takes 20mins.Otherwise you need to swap the flanges on your half shafts, may as well do they ujs at the same time.So no, your shafts will be fine, just spoke faffing at the inboard end. Quote Link to comment Share on other sites More sharing options...
herald65 Posted June 9, 2014 Share Posted June 9, 2014 So I just found the large UJ flange for the spit 1500 http://www.canleyclassics.com/searchforapart/?ptno=37H4973 Will I be able to use these with my existing halfshafts? Quote Link to comment Share on other sites More sharing options...
Clive Posted June 9, 2014 Share Posted June 9, 2014 Yep. Or find some used ones from a propshaft...Talking of which you need a custom propshaft, or use a vitesse ( or triumph 2000/2.5 any manual model) non overdrive prop and space the engine forward an inch. Quote Link to comment Share on other sites More sharing options...
Encom Posted June 9, 2014 Share Posted June 9, 2014 I have a 3.27 with OD in the Vitesse and it really does dull the acceleration. But I am taking the Clarkson approach - More power! :) Quote Link to comment Share on other sites More sharing options...
Richard B Posted June 10, 2014 Share Posted June 10, 2014 1867 wrote:I have a 3.27 with OD in the Vitesse and it really does dull the acceleration. Fit a 2.5. Quote Link to comment Share on other sites More sharing options...
Encom Posted June 10, 2014 Share Posted June 10, 2014 Got a TR6 engine bored to 2.7, cam mid head work, lightened flywheel, triple Dellorto DHLB's (yep not DHLA's) and headers, with Toyota W50 behind it. Figure that should do it :) I have no idea of what sort of power it will put out, but it's got to be better than a 45 year old 2 liter on twin 150's. Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted June 10, 2014 Share Posted June 10, 2014 That'll solve the 3.27 problem. Most likely by busting it! Unless you can manage substantial self-control in first and second gear!Sounds like a fine plan otherwise! :)Nick Quote Link to comment Share on other sites More sharing options...
Encom Posted June 11, 2014 Share Posted June 11, 2014 Very true. I'll have to resort to an R160.100% Triumph apart from the Italian carbs, Jap gear box and the Jap diff ::) Quote Link to comment Share on other sites More sharing options...
Gt6s Posted June 11, 2014 Share Posted June 11, 2014 Nick_Jones wrote:That'll solve the 3.27 problem. Most likely by busting it! Unless you can manage substantial self-control in first and second gear!Sounds like a fine plan otherwise! :)Nick3.63 is the right diff for a 1500. As for the 2.7 motor on 3.27 have the recovery vehicle on speed dial.Laurence Quote Link to comment Share on other sites More sharing options...
.thumb.jpeg.b15b81ef10abeea1c3039ae03c4a9f3a.jpeg)
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.