chris172 Posted January 31, 2022 Report Share Posted January 31, 2022 Is fitting an OD gearbox to a non OD car a worthwhile project? Do any of the suppliers do a 'kit' Quote Link to post Share on other sites
RogerH Posted January 31, 2022 Report Share Posted January 31, 2022 Hi Chris, there are no kits to upgrade your GB as such but there are plenty of OD GB's to buy in refurbished condition. Is it worthwhile !!!! A replacement box is about £2000 + the fitting. it will last 20 + years. So for £100/year you will experience better MPG quieter MPH and a silly grin each tie you turn it on. It will reduce your stress when driving at speed. It is just a better experience. Go for it. Your existing box is not worth much Roger Quote Link to post Share on other sites
Richard Pope Posted January 31, 2022 Report Share Posted January 31, 2022 Sort of. Contact https://www.overdrive-repairs.co.uk I have just gone through this exercise and had bought an overhauled by them O/d unit from a show and then bought the new main shaft, adapter plate and some gaskets from them. If you can get an old unit then basically they will sort out a kit. May be worth contacting them anyway. The problem is that I don't think anyone makes new O/d units any more so you need an old one to exchange. You will ten simply need an inhibitor switch so will have to drill the cover on your old gearbox - easy. Also some wiring additions. I bought the O/d unit for £350 a few years ago and last year the kit for £300. Quote Link to post Share on other sites
Kiwifrog Posted January 31, 2022 Report Share Posted January 31, 2022 1 hour ago, chris172 said: Is fitting an OD gearbox to a non OD car a worthwhile project? Do any of the suppliers do a 'kit' Yes it’s worthwhile, I run a saloon O/D box on my 3a, easy conversion, there is lots of info on the forum about the swap cheers Alan Quote Link to post Share on other sites
matt george Posted February 1, 2022 Report Share Posted February 1, 2022 (edited) The short answer is, yes, it is worth it. I bought an ex-US TR6 to restore and fitted an overdrive gearbox as part of the project, knowing that I planned to do a lot of miles every year. The first big trip was a 2500-mile run around Europe for example. Motorway cruising is just more relaxing with an overdrive fitted. However, if you don't expect to cover many miles a year and will mainly be pootling along A- and B-roads for example, then you will probably able to manage without an overdrive. Matt Edited February 1, 2022 by matt george Quote Link to post Share on other sites
astontr6 Posted February 5, 2022 Report Share Posted February 5, 2022 On 1/31/2022 at 6:34 PM, RogerH said: Hi Chris, there are no kits to upgrade your GB as such but there are plenty of OD GB's to buy in refurbished condition. Is it worthwhile !!!! A replacement box is about £2000 + the fitting. it will last 20 + years. So for £100/year you will experience better MPG quieter MPH and a silly grin each tie you turn it on. It will reduce your stress when driving at speed. It is just a better experience. Go for it. Your existing box is not worth much Roger There is the other alternative which is to go t ORS ( overdrive repair services) and ask them to overhaul your old gear box + do the Stag mod to the gear box lay shaft bearings and fit a J type O/D unit. This will save you a bit of money. Bruce. Quote Link to post Share on other sites
AlanG Posted February 5, 2022 Report Share Posted February 5, 2022 O/D makes the TR a much much better all round car. I fitted a J type O/D to my original 4A gearbox using a hybrid mainshaft for Pete Cox. Works well. Alan. Quote Link to post Share on other sites
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