A common problem with the LT77 ( mainshaft wear) - The Fine art of Land Rover Maintenance

Okay in this episode we take a look at a very common problem with the main-shaft wear on the LT77 and early R380 gearboxes. We look at the damage that occurs in the LT230 transfer box and why it is important to replace the input gear in the LT230 when fitting a reconditioned gearbox.

[@Electobat]

Exemplary way of giving the best level of information for experts and novices. Nice one.

[@andywithers592]

Yep that happened to me. Bang, rev, stop. These are great tutorials by the way. Had a similar issue with a Fairy overdrive in my 109. Splines on input gear and OD main shaft wore away. Again, Bang, grind, stop. But this time I could remove the OD, refit the pick off gear and cover plate (always onboard) and carry on....

[@d4jmo]

Your videos are absolutely fantastic mate and so we edited 👍

[@kaliko70]

Thank you for the excellent video - great explanation and very understandable! Glad I just discovered your channel! Look forward to buying some more Bearmach parts and getting my Landies all fixed up!

[@trailerfitter2]

+kaliko70 Have you tried this? www.bearmach-partfinder.com

[@albertflores9855]

Thanks for your response, i still enjoy my Rover and wouldn't trade for any other.

[@trailerfitter2]

+Albert Flores Yeah I get that.

[@kevinward4714]

A good idea is to make up a short gutter & to have two little wings all welded to the cover plate ( pto cover plate) so that oil runs along the gutter & falls down on to the input gear where the mainshaft fits into.It also gives extra oil feed.

[@omarukormoi1084]

I Omaru I love this teaching because it give me idea thank you.

[@chasmac56]

hey great videos your answering all my questions

[@trailerfitter2]

+chasmac mccarthy we try to help.

[@tropiquebuildingdesign7696]

As a precautionary measure for input spline wear could you potentially unbolt those 6 bolts and pack with lubricant and use an air compressor to help lube reach further areas while on the vehicle?

[@solorip]

I have rebuilt my R380 and I saw your video and replaced this part for the new cross drilled one as the output shaft was in good shape. Now I have a whining noise that increases with road speed, I think its the new output gear its a LR one fitted with timkens. The gear didnt look as good quality as the original. ashcroft say Some "pattern" gears are not "crowned" during manufacture and will whine because of the edge contact. Have you experienced this ? Great videos BTW

[@ashleygeraldkangwara5805]

I have rebuit my r380 gearbox ,its leaking in between the gearbox and transfer box.its leaking ATF from the gearbox What can be the problem

[@pauldashwood2897]

Hi mate .i have a lt77 gearbox in my 90 and have a constant vibration noise from around that area I can’t find anything loose ...any ideas what it could be many thanks ...

[@RovingAfrica]

Great video! I have a question about this I have a 85 ninety 2.5petrol so it has a 1:4 ratio box. Is it possible to exchange the shaft with a cross drilled one from a disco 1:6 box? I mean Are these the same or is it really different gears etc. Or will it change my gearing?

[@trailerfitter2]

I would suggest contacting either Syncrogearboxes or Ashcrofts. The Discovery R380 / LT230 T or LT230 Q doesn't come as 1.6 to 1 ratio. They are 1.22 to 1. The 1.6 to 1 is the Defender lower ratio transfer box.

[@albertflores9855]

Question about my 02 LRDiscovery II 4 wheel drive, my front driveshaft fell off and my rear drive shaft is not moving the car even in the low gear. Can you tell me how to make it drive my car or do you think something is wrong with the gear box. Thanks, Ernest from San Antonio, Texas.

[@trailerfitter2]

+Albert Flores you can't lock the differential in the transfer box on a D2 because has an automatic locking mechanism unlike the manual transfer boxes which have a movement on the lever to lock it unfortunately.

[@markd3ful]

did i hear that right input gear can not be replaced in situ? mines a r830 ,do these fail the same way C?

[@trailerfitter2]

If it is an early R380 it may have the same issues. Some were fitted with oil feed plates that will stop you seeing into the area I showed.

[@minus148]

is this lt77 the same transmission for a 1980 triumph tr7?

[@trailerfitter2]

yes it is but a modified version of. It was also fitted to the Freight Rover Sherpa vans as well.

[@webs37]

Any idea when you will do a video on replacing the input gear etc?

[@trailerfitter2]

+Webs sorry i just saw you comment. Yes video on replacing the input gear is on the channel I hope you have seen it?

[@webs37]

+Land Rover Toolbox Videos Yes thanks did the job about 7-8 months ago. Fitted an Ashcroft cross drilled input gear and new bearings. Doing a 300tdi conversion and your videos have been fantastic help!

[@trailerfitter2]

Glad we can help.

[@ToySldr78]

Land Rover Toolbox Videos what is the video called? I am pretty sure I am having this exact problem and need to see if I am skilled enough to do the replacement myself.

[@Nick-xc4fy]

Where did you get that gear with the cross drilling? Is it an Ashcroft unit?

[@trailerfitter2]

www.syncrogearboxes.com/ YOu can get one from here bud. Shabs will sort you out but you need to be aware of the box numbers and/or teeth count.

[@Nick-xc4fy]

@@trailerfitter2 That's great, cheers!

[@Nick-xc4fy]

@@trailerfitter2 Sorry, another question that's not off topic... Is it ok to have some up and down/left and right movement on the shaft coming out of the transfer box going to the front propshaft? If so how much? And can I tighten the nut on the end up to stop the up and down moment? Really hope I don't need a new one!

[@jaznigani1140]

with this main-shaft wear, cause clunking during changing gears

[@trailerfitter2]

Jazni Gani yup. until its gets that bad it skips the splines and drive is lost