LT77-jamesmartian?

landrover11019 · Nov 21, 2014

Hi,
Ive got a LT77 with the dreaded outputshaft 'clonk'.

Until I get a chance to fit another gearbox, could I put a heavy gear oil in the transfer box to help quieten down the clonk?

Something like this maybe;
Silkolene RHINO 140 Classic Gear Oil

Your thoughts.

jamesmartin · Nov 21, 2014

if its not a cross drilled input gear whatever oil you put in t/box wont reach the splines, you could remove pto cover and fill with grease or fit oil thrower plate ,but if splines are too bad failure might occur anyhow

landrover11019 · Nov 21, 2014

Thanks.
I'll whip the PTO cover off and have a good look, grease idea sounds good.
Ive noticed that 1st thing in the morning, when its cold, the 'clonk' is much quieter, I assume because the oils is cold and thicker?

harry2012 · Nov 21, 2014

The point is there isn't any oil getting to the output shaft splines hence why they wear.

Are you sure it's the gearbox and not the A frame ball joint or some other play in the drive train?

landrover11019 · Nov 22, 2014

harry2012 said:
The point is there isn't any oil getting to the output shaft splines hence why they wear.

Are you sure it's the gearbox and not the A frame ball joint or some other play in the drive train?

The noise is comming from the gearbox area, its made the noise since ive owned it(10yrs), over this time its had new uj's, and front diff.

landrover11019 · Dec 7, 2014

One for jamesmartin(again)

Been doing a bit of digging on the net.
It seems that the cross drilled splines are longer inside than the non drilled ones. Therefore when fitted making contact with the input splines at the non worn area.
Ive checked the serial number on my transbox and it is; 20D042400B, which according to ashcrofts website won't accept the cross drilled gear.

So, my question is, are the new non drilled input gear splines longer than the original ones?(if that makes sense).

jamesmartin · Dec 7, 2014

cross drilled splines are longer as they were made to match longer splines on r380 shaft,you can buy non cross drilled gear with longer splines for r380 box, earlier t/box b suffix wont accept 26 tooth cross drilled or longer splined gears as even though they are 26 tooth as well as teeth dont match, if you buy a new frc5428 splines wont be longer than the gear your replacing and you really want to fit the oil thrower plate kit in pto cover, kit was designed for r380 so you either cut thread off lt77 shaft or drill out the boss on the plate top take splines

landrover11019 · Dec 7, 2014

Cheers james,
so if my output splines are knackered, it's new gearbox time I suppose.

LT77-jamesmartian?

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