pjc615ukuk Posted October 13, 2017 Report Share Posted October 13, 2017 Hi All. I'm considering replacing my existing gearbox, with a re conditioned one which has an overdrive unit on. I could probably manage the removal of the interior myself, prior to taking it somewhere for the swap, and wondered how mammoth a task is it to do the exchange? Tia Peter Quote Link to post Share on other sites
Motorsport Mickey Posted October 14, 2017 Report Share Posted October 14, 2017 Make sure you take it to a TR specialist, the gearbox removal has to be lifted, pulled rearwards, lifted again and swivelled and jiggled ! to remove it from out of the interior. A normal everyday garage of today is likely to struggle and possibly damage some of the interior even though it sounds like you are going to strip (good idea) a lot of it out. Replacing the same unit is obviously a reversal but normally with a lot more in red faces and colourful language, and that's just getting it in position ! The actual feeding in of the first motion shaft (the sticky out shaft of the gearbox that goes through the clutch) is part art part science and even experienced mechanics are known to wonder outside with a tea muttering whilst they contemplate another go. Conversely if you have the "knack" it just slides together with a little jiggle and a manual turn of the overdrive flange to engage it, why didn't it do that before ? As for the time taken, with a fully stripped interior and either a gearbox lift (posted on here, excellent) or an overhead crane device to take much of the load; gearbox and overdrive removal and replace with prior built unit and a favourable engagement of the gearbox to clutch would take about 2 hours. Rebolting gearbox to engine and driveshafts etc extra to the above. Mick Richards Quote Link to post Share on other sites
Tim D. Posted October 14, 2017 Report Share Posted October 14, 2017 You can do it in a day on your own at a push.. I spread it over a couple of days one Christmas.. Most important is that to take breaks with a cuppa if you get stuck.. more damage is done by ploughing on without thinking.. Cheers Tim Quote Link to post Share on other sites
Tim D. Posted October 14, 2017 Report Share Posted October 14, 2017 Crossed post..a winch to lift it out would be good. Otherwise just manouvering a bit at a time is a good approach. Alignment is important when replacing. Bottle jack under the back of the engine to manouver it and wooden levers and wedges to manouver the gearbox. Also make sure you fit the clutch with an alignment tool.. as you slide it onto the gearbox shaft turn the drive shaft out put with the box in gear until the splines align.. Cheers Tim Quote Link to post Share on other sites
Peter Cobbold Posted October 14, 2017 Report Share Posted October 14, 2017 Replace the clutch driven plate at the same time. Peter Quote Link to post Share on other sites
AlanG Posted October 14, 2017 Report Share Posted October 14, 2017 The secret to pain free G/B replacement Alan Quote Link to post Share on other sites
GT6M Posted October 14, 2017 Report Share Posted October 14, 2017 Ahhh, but this aint a strait forads swap its a non OD box to a OD box and a few other different things thenst come into play, And, for piece of mind, some minor tweeks to clutch cross shaft an its lever this so they dont brek off,!!!, easy done. If got a non TR box, { saloon,or Dolly S, Stag, } then the input will be wrong so will need a TR input shaft fitted. the resident Gurus will keep ye right, M Quote Link to post Share on other sites
Motorsport Mickey Posted October 14, 2017 Report Share Posted October 14, 2017 Ahhh, but this aint a strait forads swap its a non OD box to a OD box. Thanks for that, wasn't exactly made clear there and I certainly missed it, bets are off. Mick Richards Quote Link to post Share on other sites
Guest ntc Posted October 14, 2017 Report Share Posted October 14, 2017 To me he said none od box fitted now ,the swap is easy only the chassis mounts to be considered Quote Link to post Share on other sites
Motorsport Mickey Posted October 14, 2017 Report Share Posted October 14, 2017 (edited) "I'm considering replacing my existing NON OVERDRIVE gearbox, with a re conditioned one which has an overdrive unit on." Now it does, ???? To much assuming that people know what you have fitted and what you intend fitting...we don't. Well done Neil for "reading the runes" and getting it right...by osmosis I think. Mick Richards Edited October 14, 2017 by Motorsport Mickey Quote Link to post Share on other sites
Guest ntc Posted October 14, 2017 Report Share Posted October 14, 2017 "I'm considering replacing my existing NON OVERDRIVE gearbox, with a re conditioned one which has an overdrive unit on." Now it does, To much assuming that people know what you have fitted and what you intend fitting...we don't. Well done Neil for "reading the runes" and getting it right...by osmosis I think. Mick Richards All he needs to work out J type or A type Quote Link to post Share on other sites
pjc615ukuk Posted October 14, 2017 Author Report Share Posted October 14, 2017 Thanks once again guys for everyone's good advice! The reason for inquiring about the timescale was two fold. A. To give me some idea of labour charges. B. Much more importantly, I don't want my car hanging around in a worshop for days on end, and being manually pushed in and out of the way,of their other jobs... I'd just like to have the work carried out by someone that treats the vehicle with respect. I'm not in any immediate rush to have this done, and wouldn't put anyone under pressure to 'turn it around' quickly, nor am I looking for a cheap job - I just need to know that my pride & joy is being looked after... Too much to ask? Anyone fancy a winter project? Cheers! Peter Quote Link to post Share on other sites
Guest ntc Posted October 14, 2017 Report Share Posted October 14, 2017 (edited) Peter I am tempted to help you? subject to my time.First port of call is the gearbox with od that is the bulk cost,call ORS .http://www.overdrive-repairs.co.uk/ Edited October 14, 2017 by ntc Quote Link to post Share on other sites
pjc615ukuk Posted October 14, 2017 Author Report Share Posted October 14, 2017 (edited) Peter I am tempted to help you? subject to my time.First port of call is the gearbox with od that is the bulk cost,call ORS .http://www.overdrive-repairs.co.uk/ I've sent you a pm NTC Edited October 14, 2017 by pjc615ukuk Quote Link to post Share on other sites
John Morrison Posted October 14, 2017 Report Share Posted October 14, 2017 Hi Peter, to answer your original question;- Gearbox in and out as a straight say clutch job - a day If there is bracket fabrication to be done - a couple of hours Plus adding the wiring - say three hours, All the above less your stripping the interior - proboby an hour, So A day and a half tops. John. Quote Link to post Share on other sites
Andy Moltu Posted October 16, 2017 Report Share Posted October 16, 2017 It depends on if you are working alone or with help and whether either or both of you are experienced spanner operators! Have had the box in and out (for a clutch change) with experienced help and air tools within 6 hours. However you will need to do some wiring so would spread it over 2 days. Quote Link to post Share on other sites
TR 2100 Posted October 16, 2017 Report Share Posted October 16, 2017 All he needs to work out J type or A type Essential, as the rear mounting for a J-type is going to mean some modifications/additional parts to fit to a TR3 chassis. AlanR Quote Link to post Share on other sites
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