Defendern00b Posted September 16, 2021 Share Posted September 16, 2021 Hi all. I have a 1991 Defender 90 with a 200tdi engine and by identification number lookups I also have an LT77 gearbox and LT230 transfer box. But when I bought it, the previous owner mentioned it had a Disco gearbox fitted. Is there any way to tell? And what's the benefit? I've got a leak that I'll need to fix, so I'm interested from a parts perspective and if there's much difference. Thanks Quote Link to comment Share on other sites More sharing options...
oneandtwo Posted September 16, 2021 Share Posted September 16, 2021 Most likely a disco transfer box fitted. If a disco gearbox is fitted the gearstick comes up through the middle seat! Quote Link to comment Share on other sites More sharing options...
Arjan Posted September 16, 2021 Share Posted September 16, 2021 Welcome ! If reverse is left of 1st gear you have an LT77 main gearbox. If reverse is right of 5th gear you have an R380 main gearbox. Transferbox (bolted behind the main gearbox) can be a number of things. With luck, you'll find a sticker stating the ratio. Otherwise, find the serial number and have a look online. The ratio of a Disco 1 transferbox is "higher that makes for somewhat higher cruising speed but a bit less pulling power." Quote Link to comment Share on other sites More sharing options...
monkie Posted September 16, 2021 Share Posted September 16, 2021 The serial number stamped on the LT230 should tell you (assuming no one has altered the gearing). Quote Link to comment Share on other sites More sharing options...
Defendern00b Posted September 16, 2021 Author Share Posted September 16, 2021 Thanks for the replies. My gearbox is definitely LT77 based on reverse position and the ID stamped on the case. And transfer box is 22D prefix, pointing to a defender LT230 + has the 1.410 ratio sticker there too. Sounds like the previous owner was telling porkies...no bother! Next job is to find the source of the gearbox leak. Any common sources to check? It's not easy to make out after going for a drive. Cheers all Quote Link to comment Share on other sites More sharing options...
cackshifter Posted September 16, 2021 Share Posted September 16, 2021 Is it red oil or brownish smelly oil? Red suggests ATF, main box. Smelly is EP90 from the transfer box (assuming correct oils). If it's plastered I expect you will have to clean it up to find the source(s). Quote Link to comment Share on other sites More sharing options...
miketomcat Posted September 16, 2021 Share Posted September 16, 2021 The disco lt77 has a bell housing around 8" long, the defender lt77 only about 4". Lt77's generally leak via the output seal, however the input seal for the transfer box is next to it they also leak. This is where the gearbox and transfer box meet. As above to work out which oil therefore which seal. If it not there then you need to track it down I'm afraid. Quote Link to comment Share on other sites More sharing options...
Defendern00b Posted September 16, 2021 Author Share Posted September 16, 2021 Got it. We'll I guess I'll clean my undercarriage and take a proper look for the cause of my leaky fluids at the weekend. I'll also measure my bell and have a sniff around too. Hand down, this is the most action I've had in a long time 😉 Cheers guys Quote Link to comment Share on other sites More sharing options...
92a Posted September 17, 2021 Share Posted September 17, 2021 Quote Link to comment Share on other sites More sharing options...
Geojake Posted September 20, 2021 Share Posted September 20, 2021 On 9/17/2021 at 5:16 AM, 92a said: I did this last week whilst changing my clutch... What a difference- no leaks!!!! I also finally got round to changing my gearbox mounts to Glencoyne ones and the vibration has halved. Well worth the effort. Quote Link to comment Share on other sites More sharing options...
Defendern00b Posted October 16, 2021 Author Share Posted October 16, 2021 Later update than planned, but after a thorough clean and a drive, one of the leaks looks to be coming from the diff pinion seal. The oil seems to get blown back to the transfer box when driving. New seal and flange kit + new nuts and bolts on order. Can anyone confirm if they a 14mm nut? That size spanner seems to fit, but slips where someone has thoroughly chewed them up in the past, so they they'll likely need cutting off... Quote Link to comment Share on other sites More sharing options...
western Posted October 16, 2021 Share Posted October 16, 2021 Transfer box & prop bolts & nuts are 9/16ths of a inch imperial not metric. Quote Link to comment Share on other sites More sharing options...
Defendern00b Posted October 17, 2021 Author Share Posted October 17, 2021 Thanks western. I'll get the imperial spanners out and see if there's enough left to get them off before resorting to the cutter Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted October 17, 2021 Share Posted October 17, 2021 14 is slightly tighter than 9/16 so may still be useful to have as an option.... 1 Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted October 17, 2021 Share Posted October 17, 2021 Get yourself one of these and make life easier https://www.ebay.co.uk/itm/Land-Rover-Defender-New-Propshaft-Nut-Bolt-Fitting-Tool-3-8-Square-Drive-9-16-/323724299502?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=710-127635-2958-0 Mo 1 Quote Link to comment Share on other sites More sharing options...
reb78 Posted October 17, 2021 Share Posted October 17, 2021 I hate mine Mo ^^^. I spend more time turning the props to get the socket on than it takes to undo it with a spanner! Quote Link to comment Share on other sites More sharing options...
L19MUD Posted October 17, 2021 Share Posted October 17, 2021 8 minutes ago, reb78 said: I hate mine Mo ^^^. I spend more time turning the props to get the socket on than it takes to undo it with a spanner! I love mine - one of the best tools I have ever bought. Attached to the little battery impact wrench and you can get in prop off easily in a couple of minutes. Well worth having to turn the prop a bit to get access 1 Quote Link to comment Share on other sites More sharing options...
reb78 Posted October 17, 2021 Share Posted October 17, 2021 Maybe its a 90 owner thing. Quote Link to comment Share on other sites More sharing options...
missingsid Posted October 17, 2021 Share Posted October 17, 2021 3 hours ago, reb78 said: I hate mine Mo ^^^. I spend more time turning the props to get the socket on than it takes to undo it with a spanner! Mine didn't fit so I've never successfully used it. Quote Link to comment Share on other sites More sharing options...
landroversforever Posted October 17, 2021 Share Posted October 17, 2021 5 hours ago, reb78 said: Maybe its a 90 owner thing. Mine fits perfectly on all sorts of mates cars I’ve used it on. Quote Link to comment Share on other sites More sharing options...
monkie Posted October 17, 2021 Share Posted October 17, 2021 I hate messing about with props full stop whether that be with spanners or the socket tool! Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted October 17, 2021 Share Posted October 17, 2021 Prop nut tool and electric rattler on the 4 poster. Life doesn't get much easier 😊 Mo 1 Quote Link to comment Share on other sites More sharing options...
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