Matt306 Posted April 30, 2017 Share Posted April 30, 2017 I have fitted my 3rail d type od to the car. The overdrive mount is around 10mm forward of the mounting plate on the chassis. Aside from drilling new holes is there a different mounting plate for a herald? Quote Link to comment Share on other sites More sharing options...
Matt306 Posted April 30, 2017 Author Share Posted April 30, 2017 in case it matters, i have this mount on my OD, is it wrong?http://www.ebay.co.uk/itm/Triu.....0:g:uDkAAMXQWzNSn0xc Quote Link to comment Share on other sites More sharing options...
RobPearce Posted April 30, 2017 Share Posted April 30, 2017 That looks like the right mount. What's the plate like? On Vitesses you need a rear-ward plate for the overdrive but on a Herald the gearbox sits a couple of inches further forward. Quote Link to comment Share on other sites More sharing options...
Matt306 Posted May 1, 2017 Author Share Posted May 1, 2017 Quoted from RobPearce That looks like the right mount. What's the plate like? On Vitesses you need a rear-ward plate for the overdrive but on a Herald the gearbox sits a couple of inches further forward. The mounting place on the chassis is the standard Herald one. I cant seem to find a pic on line ATM. There are four holes two at the front for the standard box. There are two at the rear which I suppose are for the Vitesse standard box as the OD mounting plate is different, with as you say a rear ward plate. As Heralds were never factory fitted with a OD box I wondered what other people have done. I know Spits were 4 cyl and had OD fitted but the chassis is obviously different , although i don't know if the mounting plates are interchangeable. Quote Link to comment Share on other sites More sharing options...
heraldcoupe Posted May 2, 2017 Share Posted May 2, 2017 Quoted from Matt306 As Heralds were never factory fitted with a OD box I wondered what other people have done. The Spitfire's overdrive mounting plate is a straight fit. The standard-non-overdrive plate is bulged upwards and will raise the back end of the gearbox higher than it ought to be,Cheers,Bill. Quote Link to comment Share on other sites More sharing options...
Matt306 Posted May 2, 2017 Author Share Posted May 2, 2017 Quoted from heraldcoupe The Spitfire's overdrive mounting plate is a straight fit. The standard-non-overdrive plate is bulged upwards and will raise the back end of the gearbox higher than it ought to be,Cheers,Bill. Cheers Bill I was hoping you would weigh in with your wise words. I'll start the hunt, I take it as long as its a spit od plate it doesn't matter which year Quote Link to comment Share on other sites More sharing options...
heraldcoupe Posted May 2, 2017 Share Posted May 2, 2017 Quoted from Matt306 I'll start the hunt, I take it as long as its a spit od plate it doesn't matter which year Depends on the gearbox you're using. If it's a 3-rail, ie Spitfire Mk1-IV type, then use the plate from that model. If it's a single rail gearbox, ie Spitfire 1500 type, then use the plate from thet model.The mounting plate would in fact be quite easy to fabricate. It's a flat piece of steel with folded ends for stiffening. The footprint naturally matches the non-overdrive type so could be marked out using that as a pattern,Cheer,sBill. Quote Link to comment Share on other sites More sharing options...
Matt306 Posted May 3, 2017 Author Share Posted May 3, 2017 Quoted from heraldcoupe Depends on the gearbox you're using. If it's a 3-rail, ie Spitfire Mk1-IV type, then use the plate from that model. If it's a single rail gearbox, ie Spitfire 1500 type, then use the plate from thet model.The mounting plate would in fact be quite easy to fabricate. It's a flat piece of steel with folded ends for stiffening. The footprint naturally matches the non-overdrive type so could be marked out using that as a pattern,Cheer,sBill. James Paddock had a new part for £15 which i would have ended up spending on a old one. Its out the way so not worried about authenticity here. http://www.jamespaddock.co.uk/overdrive-mounting-plate-d-type-2 metal looks a bit thin though.I will have to think about Speedo next as i have a 3.89 diff as opposed to a 4.11 diff and OD so I might look out for a Vitesse Speedo , or will the difference be not that much. Quote Link to comment Share on other sites More sharing options...
RobPearce Posted May 4, 2017 Share Posted May 4, 2017 The metal on that bracket looks like 3mm which is about what the original plate would have been. It's fine.If you have a 3.89 diff your speedo will under-read by a few percent compared to now, but they're often a few percent the other way anyway. It's probably not worth worrying too much. Quote Link to comment Share on other sites More sharing options...
Matt306 Posted May 4, 2017 Author Share Posted May 4, 2017 Quoted from RobPearce The metal on that bracket looks like 3mm which is about what the original plate would have been. It's fine.If you have a 3.89 diff your speedo will under-read by a few percent compared to now, but they're often a few percent the other way anyway. It's probably not worth worrying too much. With just the Diff i wasnt worried as you say its only a couple of MPH. The Overdrive conversion will affect the reading too? Quote Link to comment Share on other sites More sharing options...
herald948 Posted May 5, 2017 Share Posted May 5, 2017 Quoted from Matt306 The Overdrive conversion will affect the reading too? No, it won't! Quote Link to comment Share on other sites More sharing options...
Matt306 Posted May 7, 2017 Author Share Posted May 7, 2017 Quoted from herald948 No, it won't! Oooh thought it might with all the different gubbing on the end. Oh well I'll keep the speedo. I'll just put my GPS Pratnav on to check how much the difference is anyway. Shouldnt be too much , great news. Quote Link to comment Share on other sites More sharing options...
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