Series 111 primary pinion converter

Hi, this is probably a simple one for people in the know, but I am not sure the best option so I would appreciate some advice.
I am currently trying to install a TDI300 engine (Formerly in a Disco 1 1995) into my series three 1972 (Originally (1972) 6cyl petrol) engine, I have just removed prior to this new tdi engine install, an underpower Ford transit 2.5d engine.
I notice the Primary pinion on my series gearbox is different from the 22? spline socket in the clutch plate of the tdi . please could some one advise which is the best way forward.
1) is there a simple adapter coupler available
2) is there an aftermarket replacement primary pinion available? (if so is it a simple swap?)
2) do I change the pinion over from the gearbox on the disco (will it fit? i think it might be too long) to my series box
3) do I need to fit a different series box? from a defender etc
I really would like to keep the series box with all the different knobs etc as it is more true to the series landy look and I also have the overdrive which it would be good to retain. I also feel that fitting the disco gear box will be major hassle.

It would also be great if someone could point me in the right direction for some you tube video of doing the conversion too.

Thanks for having a look at my post and any help you might be able to offer

Jon (Rif)

I'm not sure a series gearbox will cope with the torque of a tdi300

Col

Fit 9.5" clutch plate from series with discovery cover plate works with the 200tdi lots of others have done it so should be possible..
Have a look at Glencoyne website.

Is there a reason why you'd want the series gearbox in such a set up? (Other than potential immediate ease of fitment)

If I were doing such a thing I'd much rather have a the gearbox and transfer case for the more modern engine as well as higher geared Range Rover differentials. I'm sure this would be more expensive and more involved to fit but you'd have a much nicer vehicle at the end of it wouldn't you?

Stretch said:

Is there a reason why you'd want the series gearbox in such a set up? (Other than potential immediate ease of fitment)

If I were doing such a thing I'd much rather have a the gearbox and transfer case for the more modern engine as well as higher geared Range Rover differentials. I'm sure this would be more expensive and more involved to fit but you'd have a much nicer vehicle at the end of it wouldn't you?

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I must admit that would make a lot of sense, the problem is mainly time cost and I would like to retain the original series 3 look with all the gear levers. I might well keep the gearbox from the Disco and put it in another day, the other problem with fitting the range rover diffs, I would like to go that route but I have a Salisbury back axle and I am told there is quite a bit of work and adaption needed to shoe horn the higher diff in to the case, let me know if this is not the case though I might re think it.
Thanks for your comments, it is worth consideration.

Best regards

Jon (Rif)

Blackburn said:

Fit 9.5" clutch plate from series with discovery cover plate works with the 200tdi lots of others have done it so should be possible..
Have a look at Glencoyne website.

Click to expand...

Thanks for the tip I will try that out, after a bit of though I realised that the clutch plate sleeve may need changing an it good to know which plate to get hold of

Thanks

Jon (Rif)

Colthebrummie said:

I'm not sure a series gearbox will cope with the torque of a tdi300

Col

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Why do you think that?

People have been fitting Tdi's and V8's to Series vehicles for decades....

300bhp/ton said:

Why do you think that?

People have been fitting Tdi's and V8's to Series vehicles for decades....

Click to expand...

Maybe it's just me being paranoid about my own series 3 gearbox. I've done a fair bit of work on my landy but I always feel the box is the weak link. It also depends on your driving style, the 2.5 engines plod along quite nicely and people who have those engines accept their limitations and drive accordingly. Whereas, if you go to the trouble of shoehorning a 3000 TDI in, your gonna want to give it the beans, well, at least I would. There seemed to be a time. On this forum where a heck of a lot of the threads were from people needing to know how to fix their gearbox. Also, the price of them has gone up significantly, because they are becoming rare. This is only my opinion of course it is born out of a life time of experience of various mechanical failures of various components.
Col

Rifpilchard said:

I must admit that would make a lot of sense, the problem is mainly time cost and I would like to retain the original series 3 look with all the gear levers. I might well keep the gearbox from the Disco and put it in another day, the other problem with fitting the range rover diffs, I would like to go that route but I have a Salisbury back axle and I am told there is quite a bit of work and adaption needed to shoe horn the higher diff in to the case, let me know if this is not the case though I might re think it.
Thanks for your comments, it is worth consideration.

Best regards

Jon (Rif)

Click to expand...

you can change salisbury to 4.7 from 3.54 but id have thought 3.54 is what youd want

Colthebrummie said:

Maybe it's just me being paranoid about my own series 3 gearbox. I've done a fair bit of work on my landy but I always feel the box is the weak link. It also depends on your driving style, the 2.5 engines plod along quite nicely and people who have those engines accept their limitations and drive accordingly. Whereas, if you go to the trouble of shoehorning a 3000 TDI in, your gonna want to give it the beans, well, at least I would. There seemed to be a time. On this forum where a heck of a lot of the threads were from people needing to know how to fix their gearbox. Also, the price of them has gone up significantly, because they are becoming rare. This is only my opinion of course it is born out of a life time of experience of various mechanical failures of various components.
Col

Click to expand...

I must admit I too was a bit concerned that I was putting in around 115hp in to a box that was originally designed to take possibly only 70-80hp, the key issue fro me was fuel consumption so I tend to be less inclined to be so heavy footed on the accelerator i am not sure if the over drive helps this or makes it worse please tell your thoughts.

I haven't got an overdrive so I've no experience of them but I would imagine that using the OD at higher engine speeds probably doesn't make any difference to the gearbox internals but it is something else to go wrong. I must admit though, when I am driving my landy at 50+mph and listening to the engine noise, I do then wish I had an OD.

Col

Hi col
For a moment then you made me think of my dad he would have said exactly the same thing. If looking a brand new car with loads of extra gadgets on he would have said "loads more things to go wrong on it then" bless him!