1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Welcome To LandyZone!

    LandyZone is the biggest Land Rover forum on the net. We have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.

    Registering is free and easy just click here, we hope to see you on the forums soon!

300tdi auto conversion from lt77

Discussion in 'Defender 90 / 110 / 130' started by owas, Dec 28, 2020.

< Previous Thread | Next Thread >
  1. owas

    owas Well-Known Member

    Joined:
    Jul 30, 2014
    Posts:
    1,048
    Likes Received:
    857
    So I've got an Lt77 with a 300tdi in the NA position in my '86 110,
    Always wanted an auto though, and abit of a kit popped up on ebay from a disco 1 and it didn't go for a whole lot of money, I'll probably get more back for the lt77..

    Now for the questions, looking at the picture is there anything missing I would need? Not picked up yet so don't know how the automatic selector all goes together,is there abit of play on where it gets installed?
    I'll have to weld the engine mount brackets in the correct position but other than that, do the gearbox mounts line up with the lt77 position?

    Screenshot_20201228_183022.jpg
     
  2. Def90man

    Def90man Very Huge Member Full Member

    Joined:
    Aug 31, 2016
    Posts:
    5,216
    Likes Received:
    9,010
    Location:
    Far out West
    Oil cooler possibly? I think the selector can be flexible because it’s just a cable.
     
  3. Litch

    Litch Well-Known Member

    Joined:
    Jun 26, 2006
    Posts:
    2,084
    Likes Received:
    440
    Location:
    Bedfordshire
    Dipstick, oil-cooler & hoses, Hi/ Lo mounting bracket. Can't see any of them in the photo.
    What about the inhibitor / reverse switch? They are expensive if missing.
     
  4. Def90man

    Def90man Very Huge Member Full Member

    Joined:
    Aug 31, 2016
    Posts:
    5,216
    Likes Received:
    9,010
    Location:
    Far out West
    Do you have the kick down brackets and cables as well?
     
  5. jamesmartin

    jamesmartin Well-Known Member

    Joined:
    Dec 8, 2010
    Posts:
    91,425
    Likes Received:
    19,797
    Location:
    louth lincs
    youd want 300tdi crossmember /box mounts
    you need the hi/lo housing support bracket
     
  6. EeEk

    EeEk Active Member

    Joined:
    Aug 9, 2008
    Posts:
    602
    Likes Received:
    97
    Location:
    Elgin, Scotland
    My disco 300 tdi auto gearbox has an oil cooler.

    Filler tube, dip stick

    kick down cable and brackets for fuel pump

    Not sure whats in the middle of that flywheel/flex plate...but you need the spacer shim - which looks there and which is also supposed to be measured and chosen to suit There is also and adaptor spigot thing - don't know what it would be called or if its there... You got a list of parts or just the pic?

    I used standard transfer box mounting points and worked forward from there...
     
  7. Litch

    Litch Well-Known Member

    Joined:
    Jun 26, 2006
    Posts:
    2,084
    Likes Received:
    440
    Location:
    Bedfordshire
    I remember when I bought my 300TDi auto conversion kit from Ashcroft's, as I looked at the collection of parts David told me that it would all become clear as I started putting it together!
    It was an "interesting" time but at least I knew I had all the parts I needed and that they would fit the vehicle without any modification (I just needed to work out how they all went together!). If you are starting with a collection of parts that you don't know if it is complete and trying to fit to a vehicle that it won't bolt straight onto then it will certainly keep you busy for a few evenings.

    If you are interested I started a thread (with photos) when I did my conversion back in April 2016, based on the Ashcroft kit but hopefully there is some information in there that may help.
    Search for "300TDi Auto Conversion".
     
    mick the builder likes this.
  8. owas

    owas Well-Known Member

    Joined:
    Jul 30, 2014
    Posts:
    1,048
    Likes Received:
    857
    Thanks for the replies,
    Looks like I might need a few other bits too, I'll see what I'm given when I go to collect Wednesday,
    Will be a while before I take it off the road to do the work, so I'll gather everything beforehand.
     
  9. owas

    owas Well-Known Member

    Joined:
    Jul 30, 2014
    Posts:
    1,048
    Likes Received:
    857
    Well it looks like it comes with pretty much everything I need other than the oil cooler, kick down bracket and I'll need a crossmember.

    Inhibitor switch, dip stick, high low bracket all present

    Not sure how it all goes together yet but I don't think I need to measure the spacer because it'll already be set correctly?

    Need to get my other 2 cars on the road before I think about starting this though
     

    Attached Files:

    Def90man likes this.
  10. Mingus

    Mingus Active Member

    Joined:
    Jan 3, 2015
    Posts:
    122
    Likes Received:
    46
    Have you driven a defender 300tdi auto before? I've got two and they are way slower than the r380 300 tdi i have but wife only droves autos so needs must.
     
  11. Litch

    Litch Well-Known Member

    Joined:
    Jun 26, 2006
    Posts:
    2,084
    Likes Received:
    440
    Location:
    Bedfordshire
    While I agree that it would be a good idea to carry out a test-drive of a similar vehicle first, I disagree that they have to be way slower.
    I know a fully loaded 110 is always going to be more sluggish than a lightly loaded 90 (like mine) but if it is your own vehicle that is being converted at least you will be aware of how it performs beforehand.

    I was very kindly offered a test-drive in a 300TDi auto 90 before I did my conversion and if I had based my decision on that then I would probably not have gone through with it.
    The chap who let me drive his 90 said that I would probably find his vehicle more lively than mine as he had used a Disco engine / transmission which uses a different pump & ECU (am I correct here?) which when new resulted in more power than the Defender model. Driving the vehicle was a different matter however and I was distinctly less than impressed, the autobox was fine but the performance was well down on mine and it just seemed so sluggish / hard work to progress around the lanes where the test-drive took place (lanes which are very similar to where I live).

    As I stated in the original thread covering my conversion, my 90 had always been a spirited performer and when I finally got the autobox gearing right it was still a sprightly performer (my 300TDi had been fitted with a 1.2 transfer-box from brand-new which suited it perfectly, I stuck with it for 12-months after fitting the autobox but finally decided that I needed to go to 1.4 which suits the ratios of the autobox much better). When bimbling around as normal it is just so "right" but if needs must then you hit the accelerator which operates the kick-down and allows you to carry out the maneuver (usually overtaking) with confidence. If I was pushed then I would say that yes it has probably lost the edge but this is not noticeable in day to day driving and certainly no different from any vehicle when comparing manual - auto transmissions.
    Fuel consumption is a different matter however, on normal day to day driving (around the lanes where I live and onto the roundabouts of Milton Keynes) it is certainly 2-3MPG down on before but on the motorway the different is negated and there is practically no difference. Having owned the vehicle for going on 22-years and carried out fuel consumption checks every time I fill up in all those years I can easily check any difference.
     
  12. owas

    owas Well-Known Member

    Joined:
    Jul 30, 2014
    Posts:
    1,048
    Likes Received:
    857
    The one thing is my transfer box is a 1.6,so I'm not sure how that's going to go..
    I can currently pull off quite quickly but top out at around 60,70 is screaming.
     
  13. Litch

    Litch Well-Known Member

    Joined:
    Jun 26, 2006
    Posts:
    2,084
    Likes Received:
    440
    Location:
    Bedfordshire
    I know yours is a 110 whereas mine is a 90 and I am assuming you have tyres similar in diameter to my 265/75x16's but I suspect that you may find it a tad too low geared with the 1.6 unless you do lots of heavy towing etc.

    The final drive ration on the autobox is higher than the R380 so in my case if meant that the 1.2 transfer-box (that had suited the vehicle so well since new) was too tall for the autobox and after 12-months of seeing if I could live with it I swopped to a 1.4 and it transformed the vehicle.
    Perhaps like me you may decide to stick with your existing transfer-box for a while and see how it goes? If in time you then decide that you want the 1.4 after all it is less than a days work to swop them over from underneath. Of course you could bite the bullet and get a 1.4 now but if you then found that it didn't drive quite as well as you were expecting you will always be wondering "what if?".
    This is based on getting a recon transfer-box from the likes of Ashcroft (and the cost it incurs) rather than taking pot luck on a SH one (which will almost certainly be a lot cheaper).
     
  14. EeEk

    EeEk Active Member

    Joined:
    Aug 9, 2008
    Posts:
    602
    Likes Received:
    97
    Location:
    Elgin, Scotland
    Id agree with the transfer box ratio suggestions. 1.2 in my 90 but I think it would be better with a lower ratio....you just cant get fast enough on the roads here to get converter lockup.
    The Rangie in my profile pic as a 300 tdi auto with 1.6 transfer. 3.9:1 diffs and 285 tyres. Pulls fine and can easily do the speed limits.
     
  15. owas

    owas Well-Known Member

    Joined:
    Jul 30, 2014
    Posts:
    1,048
    Likes Received:
    857
    I'll stick with the 1.6 and see how it goes,
    I do seem to be doing some longer distances recently but I don't really like going much above 60 in a defender anyway..

    Ive got my head round the how it all goes together, I'll put the gearbox in the first then hook the engine on and weld the new mounts in on the crane

    Had a quick look at the gear selector, couldn't quite work out how that all goes together but I'm sure I'll work it out.

    I have a strong steel box I'm using in the center seat section, I think that'll be perfect to mount the gear selector to, will be in the perfect position then I reckon.
     
< Previous Thread | Next Thread >