jamesmartin
Well-Known Member
youd have to pull box to bits to fit the correct input shaft so you could fit docs kit or fit the longer defender selector shaft and fit quadrant instead, the t/box is were the ratio differecne is
Disc300Series
Active Member
Right, I got a discovery box cos the seller lied and basically was an arse about it when I tried to get some cash back out of him
£250 for a new V8 bellhousing and AW transmission recon R380 box but should have been defender spec instead of disco the bastard
Anyway, onwards! (design and pics for the completed one courtesy of defcrazy)
This thread popped up http://www.landyzone.co.uk/lz/f6/discovery-engine-gear-box-ex-mod-s3-217336.html and after a few posts James mentioned a mod that would allow for a discovery box to be converted to defender spec without taking the thing apart to fit, the conventional way is to take FTC4588, FTC5120 and a defender selector housing then replace the disco bits. However in an attempt to not split the box James linked me to this thread
http://www.landyzone.co.uk/lz/f7/wh...n-defender-r380-gearbox-disco-one-137436.html
The following is a discovery to defender gearbox convertor, simple enough if you have a lathe or know someone with one. This is it about 50% complete so far, two of the three lips are turned and then it needs a hole drilling and tapping along with a 5/8th hole in either end with a 3/4" solid in the to separate them.
This adaptor started life as a 50mm bar and was then turned to the correct diameter
The piece will finish life looking like this (may surface finish it on the grinder so its super smooth) But essentially its a 2" long piece that makes up the lost selector shaft difference
You can see exactly why you need to move the selector back from this pic
This only applies if you're doing this mod on a series, if its a disco into a defender it should be fine distance wise.
Now as I've got a V8 fitted and the mounts are in the same place as the original engine and I'm using a modern box I had to do the following;
New crossmember made up for the middle where I have to chop out the old box in order for the LT230 to fit in.
IIRC is 120x100x5mm box and then I used 6mm plate for the ends, simple enough, chop the box 12mm too small then the 6mm plate makes up the difference
So why not just buy a defender box and save the hassle ?
Well a discovery box is peanuts compared, usually come with a decent engine connected and they're easy to come by!
This mod will then cost you £10 in steel at best and some man hours, compared to about £100 in LR parts, you'll need an LT77 or R380 top housing, but you can use your old one, an LT95 one could be made to fit I reckon. Going to get my hands on one and measure up.
Will also be doing another mod at some point which involves less box stripping
Heres the above mod in place (and yes it has worked, not mine but minimole's)
Has anyone got all the measurements of the gearbox adaptor please so I can get my local machine shop to make one.
kenny16m
Member
I'd like to thank the person who came up with this mod I've fitted it today as so far so good. I bought the fork from eBay £40 and then the steel bar was £10 but had enough to make about 5 of them. Took me about an hour to turn it on the lathe but last time I used one was in high school 15 years ago..but it does the job
Attachments
I'm sorry to bring this post up but... Ive got a lad rover 90 on a C suffix and I'm lead to believe the output shaft is buggered shall we say. so trying to find a lt77 box is very hard. i can get a discovery r380 box no problem. so with the kit from ashcroft and the process of taking the gear selector of the lt77 box, will i be able to fit the r380 box to my 200tdi motor and the gear stick won't foul and all will work fine ?
Don't want to dive in to something without knowing the whole ins and outs of the job
Don't want to dive in to something without knowing the whole ins and outs of the job
jamesmartin
Well-Known Member
unless you get a short bell housing type r380 built for such use ,the disco or defender r380 box will be too long,conversions are possible but require stripping box and new pricey parts,youd be best reconditioning yours or buying another defender lt77
hey guys,
this post is now 6 years old and the pics are missing. I want to convert my discovery lt 77 to Defender spec, allready bought a Defender r380 top housing wich suits the lt77. plan was now to by this conversion part at ashcroft:
http://www.ashcroft-transmissions.c...-rebuild-kits/selector-rail-adapter-yolk.html
but ashcroft says this wont fit the lt77. i dont believe that it wont fit, why not!? what do you think??
thanks and best regards, leon
this post is now 6 years old and the pics are missing. I want to convert my discovery lt 77 to Defender spec, allready bought a Defender r380 top housing wich suits the lt77. plan was now to by this conversion part at ashcroft:
http://www.ashcroft-transmissions.c...-rebuild-kits/selector-rail-adapter-yolk.html
but ashcroft says this wont fit the lt77. i dont believe that it wont fit, why not!? what do you think??
thanks and best regards, leon
jamesmartin
Well-Known Member
r380 top needs modification to fit an lt77, youd want the spigot likes in the kit and the def lt77 quadrant not the r380
i dont get why the def r380 Quadrant wont work in an lt77... the DISCOVERY lt77 box Looks the same like the def r380 from the inner where the Quadrant is locatet. maybe the r380 Quadrant will collise somewhere because of the reverse gear lock (i dont know) but even if this Comes true the r380 quadran can be modified i would say...
you could do a lot worse than listen to JM when he is talking Landrovers. He has a lot of experience with them.
