RoLandRover Posted February 25, 2006 Share Posted February 25, 2006 Hello all! I'd like to ask the following question to you all,. as I can't find the ultimate answer on the Dutch Forum. I'd like to adapt a Lt77 gearbox of my 200 Tdi Disco (wich is now being dismantled) to bolt it to my 'new' 73 RR V8. Yes,..I know 'why don't you get a R380 wich is stronger! ' well because budget is tight and I do happen to have the LT box. and as the box is a 93 model I believe it's a better type then the older Lt's , would it be the LT77s ?? as far as I know, I need a new bellhouse, but what with the outputshaft? is it different? can it be swapped for the v8 type shaft? and can it be done by an average D.I.Y mechanic like me what modification wil be needed to fit it to the car? i'll be very pleased with all the info i can get! gr, Roland Link to comment Share on other sites More sharing options...
minivin Posted February 25, 2006 Share Posted February 25, 2006 Your about to do what I've already got completed pretty much there is two routes you can take: 1) Retain Short Bellhousing and Input Pinion; Ok, This one requires that you remove the main case and get the input pinion out, machine the nose of the input pinion to 20mm diameter and that should then locate within the flywheel bush (check your flywheel bush just incase it is not 20mm diameter!). You then refit the Input Pinion, fit the main case and find a Series V8 Adapter ring for the 2.25 4 cyl engine gearbox, when you fit this adapter ring you can then bolt the short bell housing on the LT77 straight to the adapter ring and onto the V8 engine. Only other bit you have to do is buy a 2.5D clutch and diaphragm plate and have the flywheel drilled and tapped for this clutch as only this clutch will fit under the adapter plate, the standard V8 clutch is too big! 2) Replace Items for Disco or Long Bellhousing; Ok, this one involves you retaining the standard V8 clutch, but removing the input pinion if you have a short one (250mm long ish) and finding a V8 input pinion (about 350mm long) or a disco input pinion which is pretty much the same beast. Fit the disco input pinion into your box, remove the short bellhousing (see piccie above) and fit the Disco/V8 long bellhousing. Once you have that done just bolt it up. If you want an explanation on how to pull the gearbox cover off just shout Link to comment Share on other sites More sharing options...
minivin Posted February 25, 2006 Share Posted February 25, 2006 Ok, might as well explain it now anyway: Bellhousing Removal; Firstly, remove all the clutch release mechanism, it gets in the way of some of the fasteners Then remove the six main bolts within the bellhousing. The bellhousing will then come off after a couple taps as it is located on two dowls Removing LT77 main case; Firstly, remove the bellhousing. Then remove the input pinion cover (the item that also guides the clutch release bearing) by removing the six screws that hold it on. You will find two shims behind the cover and two taper roller bearing races, remove these and store them somewhere safe. Remove the gearchange mechanism from the top of the LT77 extension case (the aluminium case on the back of the gearbox). Inside you will find two bolts that go through the case, through the intermediate case and into the main case. Carefully remove these two bolts and store safely. Remove the two screws that hold on an oval plate on the top of the gearbox maincase, this oval plate has also a locating stub that goes into the main case and guides the gearchange mechanism, remove this oval guide plate and store. Remove all the main case to intermediate/extension case bolts and store. Position the gearbox so that the main case is uppermost ie put the LT77 on-end, and tap around gaskmet joint to try and release joint. If you have the LT77 on it's side when doing this, there is a washer inside for the reverse gear shaft that can drop off as it is not retained by anything else but the main case. Once joint has been broken, raise the main case up and off of the assembly and you have revealed the internals. you should be able to then pull the layshaft and mainshaft assembly apart enough and with some wiggling to get the input pinion out. With the input pinion out you can now fit your alternative input pinion or get your present input pinion machined and then assembly is the reverse. Think that's it...... Link to comment Share on other sites More sharing options...
LR90 Posted February 25, 2006 Share Posted February 25, 2006 Nicely said Minivin. FWIW when I put the Jag engine in my series I took the approach of machining out the crank to fit the (larger) series spigot bush and kept the gearbox unchanged. Another option that may work here. Link to comment Share on other sites More sharing options...
minivin Posted February 25, 2006 Share Posted February 25, 2006 Nicely said Minivin. FWIW when I put the Jag engine in my series I took the approach of machining out the crank to fit the (larger) series spigot bush and kept the gearbox unchanged. Another option that may work here. Cheers Yup, input pinion nose on the short pinion is 22.2mm (7/8"), so you could carefully ream the bush out the required amount as I think there is enough meat in the bush to do this Link to comment Share on other sites More sharing options...
Bush65 Posted February 25, 2006 Share Posted February 25, 2006 What advantages do you expect from replacing an LT95 with an LT77? You will find performance sluggish with the LT77 gearing. LT77 is not as strong. And you also need an LT230. Link to comment Share on other sites More sharing options...
RoLandRover Posted February 27, 2006 Author Share Posted February 27, 2006 cheers all,..very helpfull advise! What advantages do you expect from replacing an LT95 with an LT77?You will find performance sluggish with the LT77 gearing. LT77 is not as strong. And you also need an LT230. yes I know,.it isn't as stong,..but it won't get abused and as torque and Hp arwe similar to the Tdi i think it won't be a problem. I do have a complete tranny including the lt230 of my disco. the main reason i dicided to opt for a lt77 is the 5 speed, fuel economy, and i've got a drive shaft of a td5 with the double yoke on it, wich i wich to re-use on the range. thsi to cope with the ride height of the car. Why would the lt77 make my range be sluggish? cause of the short first and second? gr, Roland Link to comment Share on other sites More sharing options...
SHAVED_GORILLA Posted February 27, 2006 Share Posted February 27, 2006 Why not swap your diesel LT77 for a V8 one? SG Link to comment Share on other sites More sharing options...
RoLandRover Posted April 2, 2006 Author Share Posted April 2, 2006 Why not swap your diesel LT77 for a V8 one?SG I'm indead, probably swapping the discobox for a v8 one,.. but getting to my next problem, does anyhave have a photo's or other info of how to adapt the tunnel? the tunnel does need a bit of trimming or be swapped for an other one. or does anyone know a website with detailled information? gr, Roland Roland <b>Ran Over</b> <a href="http://RanOver.fotopic.net" target="_blank"><img src="http://thumbs.fotopic.net/354025000280.jpg" alt="RanOver 3.5V8 '73" > </a> <b>Nulla Tenaci Invia Est via.</b> Waar een wil is, is een weg. Link to comment Share on other sites More sharing options...
istruggle2gate11 Posted April 3, 2006 Share Posted April 3, 2006 Or, another way, which I did purely for the convinience of having all the parts lying around: LT77s with short bellhousing off a 200tdi. V8 engine with series adaptor plate. Then using 200tdi clutch and redrilled flywheel, all fits together nicely. Havent slipped the clutch yet and Im running with 180+ BHP Torque??? Personally, as SG mentioned, I would just opt for the v8 bell housed LT, the only reason I didnt was due to all this fitting in a series 1 86", prop lenghts and all that. But to be honest, if starting from scratch on your project, it would get the LT95 for much better gearing, strength and fit an overdrive for top end. (OD for the rangie are cheaper than series ones). Use the gear calculator off this forum for a good comparision, it made my mind up on my rangie, its LT95. Link to comment Share on other sites More sharing options...
RoLandRover Posted April 3, 2006 Author Share Posted April 3, 2006 But to be honest, if starting from scratch on your project, it would get the LT95 for much better gearing, strength and fit an overdrive for top end. (OD for the rangie are cheaper than series ones).Use the gear calculator off this forum for a good comparision, it made my mind up on my rangie, its LT95. seems to be a fine option,.. but,... I do have a double yoke driveshaft of a disco TD5,.. so that wil be a problem to fit. any idea were to look for a good OD unit? as being in Holland sources are limited compared to the U.K. gr, Roland Link to comment Share on other sites More sharing options...
istruggle2gate11 Posted April 3, 2006 Share Posted April 3, 2006 Roland, Keep looking on ebay, although they do seem expensive on there. Also, try all the landie forums. Plenty around, just a little patience sould see you right. Link to comment Share on other sites More sharing options...
RoLandRover Posted April 3, 2006 Author Share Posted April 3, 2006 I'm still hoping for some more info on the gearbox swapping,... does anyone know if the Lt 85 out of a defender fits a 73 Range?? gr, Roland Link to comment Share on other sites More sharing options...
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