rotten herald Posted June 22, 2004 Share Posted June 22, 2004 I need a Vitesse Diff, anyone got one lying about, preferably a non overdrive one. Link to comment Share on other sites More sharing options...
heraldcoupe Posted June 22, 2004 Share Posted June 22, 2004 Overdrive won't make any difference to the diff ratio originally fitted, the model of Vitesse will. The original Vitesse 6 had a 4.11:1 final drive, the 2L cars had a 3.89:1,Cheers,Bill. Link to comment Share on other sites More sharing options...
rotten herald Posted June 22, 2004 Author Share Posted June 22, 2004 The model is a 1963 Vitesse 2l, so does anyone have a diff to suit. Link to comment Share on other sites More sharing options...
heraldcoupe Posted June 22, 2004 Share Posted June 22, 2004 Is that a typo? The 2L wasn't introduced until 1967, all models up until then would have been Vitesse 6, ie 1600cc with the 4.11:1 diff. I've got one of the correct type lurking here somewhere, no idea if it's any good though as it came out of a part dismantled chassis I acquired a while back.Cheers,Bill. Link to comment Share on other sites More sharing options...
rotten herald Posted June 23, 2004 Author Share Posted June 23, 2004 its a 2litre mk1 apparently. i don't know my vitesses, all i know is it has a 13/60 estate diff, and top speed of 50 Link to comment Share on other sites More sharing options...
GarethP Posted June 23, 2004 Share Posted June 23, 2004 Sorry to hijack the thread, but a quick question...My 1971 Herald 13/60 has a 1978 Spitfire 1500 engine and maybe gearbox(I must ask...) in it - is my top speed limited to 50mph because of a diff mismatch? Or do I just need to fit an overdrive?Thanks Link to comment Share on other sites More sharing options...
Deleted User Posted June 23, 2004 Share Posted June 23, 2004 drive it as fast as it will go and see! Link to comment Share on other sites More sharing options...
GarethP Posted June 24, 2004 Share Posted June 24, 2004 It get's very uncomfortable at any speed over 50! Link to comment Share on other sites More sharing options...
Clive Posted June 25, 2004 Share Posted June 25, 2004 Whats the problem, out of revs or vibration. If vibration sounds like propshaft out of balance, if out of revs either overdrive or longer ratio diff or both!cheersClive Link to comment Share on other sites More sharing options...
rotten herald Posted June 25, 2004 Author Share Posted June 25, 2004 well i'm out of revs, 6500 rpm Link to comment Share on other sites More sharing options...
heraldcoupe Posted June 26, 2004 Share Posted June 26, 2004 If you're genuinely doing 6500rpm at 50mph in top gear, that would mean your diff ratio is around 8:1 - pretty unlikely given the ratios produced by Standard Triumph in this carrier. I would suggest verifying your instruments and finding where the error (or more likely, errors!) lie(s). Cheers,Bill. Link to comment Share on other sites More sharing options...
rotten herald Posted June 27, 2004 Author Share Posted June 27, 2004 apparently i have a 4:11 diff, i'll borrow my old mans road angel to check speedo. but i'm sure revcounter good.either way, i need some better ratios, having said that its great away from the lights Link to comment Share on other sites More sharing options...
Jason Posted June 28, 2004 Share Posted June 28, 2004 50 mph in my Herald 13/60 was uncomfortable with standard drive train - a single rail all synchro J type overdrive gearbox sorted that and now it's a different car. The motorway is inviting and not so scary now :-) Link to comment Share on other sites More sharing options...
Tim Bancroft Posted June 28, 2004 Share Posted June 28, 2004 Best compromise of ratios etc for these small chassised Triuphs has gotta be a 3.63 diff coupled with a 'j' type o/d box. My GT6 has this combo. and is just right- o/d top is about 23mph/1000 revs.Any thoughts. Link to comment Share on other sites More sharing options...
heraldcoupe Posted June 28, 2004 Share Posted June 28, 2004 3.63:1 is OK with a 2L or 1500, but you wouldn't want one with any of the smaller engines. The 4.11:1 is ideal for the 1147 and 1296, particularly the revvy GE/FD units. An overdrive is the best solution to relaxed cruising, with diff changes you are always compromising between relaxed cruising and acceleration,Cheers,Bill. Link to comment Share on other sites More sharing options...
rotten herald Posted June 29, 2004 Author Share Posted June 29, 2004 ok, anyone got a overdrive box, and 3:63:1 diff. Link to comment Share on other sites More sharing options...
Herald Freak Posted September 17, 2004 Share Posted September 17, 2004 are the diffs different between the 1200 and the 13/60? i am running a mk4 spit engine in a 1200 but have read somewhere about quarter shafts braking with 60hp and i am lead to believe the spit enging as standard was/is 75hp,Thinking about an overdrive as my box is trying to expire or buying a cheap engine from e-bay and rebuilding it with balenced components and cosworth bolts giving a higher safe rpm limit Link to comment Share on other sites More sharing options...
heraldcoupe Posted September 17, 2004 Share Posted September 17, 2004 The diff ratio is the same, but you are correct that thicker output shafts were used on the 13/60. This was commonised on late production 1200s. There is a number stamped on the underside of the nose piece of the diff. This will tell you which type you have, though it's likely to be smothered in black goo! Prompt me with the number and I'll check my records to see if it's before or after the change point.Cheers,Bill. Link to comment Share on other sites More sharing options...
Herald Freak Posted September 18, 2004 Share Posted September 18, 2004 Its a GA which i think is the small type, anre the 2 units directly interchangeable, either by changing the diff and 1/4 shafts or does the carrier need to come out as well? Link to comment Share on other sites More sharing options...
heraldcoupe Posted September 18, 2004 Share Posted September 18, 2004 GE all have big shafts, GA upto around GA23xxx have small shafts, thereafter commonised with GE (13/60). I'll dig out the exact number after the weekend, but I'm in the middle of last minute sorting out for the Duxford show tomorrow.Easies way to swap diffs is to disconnect the 3 flanges and 4 mounting bolts, and replace the entire assembly. Internally there are more differeences than are worth while dealing with.Cheers,Bill. Link to comment Share on other sites More sharing options...
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