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Changing your LT230 transfer box gearing ratio


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Hi Guys,

Finally got my 110 moving!!

I have swapped the 2.5NA with a Discovery 200tdi. Still got all the small tedious jobs to do but definitely on the move.

I have yet to get it on the open road yet but i fear that i this upgrade has now left me under geared.

The LR comes with a 1.667 ratio box and i would like to fit a 1.41 ratio.

Unfortunately there arent that many/none of these boxes available locally.

I am not entaining the thought of fitting 265/75 16 tyres!

Is it possible to swap the gears internally?

Would anyone want to swap my 1.667 set for a 1.41??

I am also planning to fit a LT77 to my Lightweight hybrid and have been watching eb. There are a few that have come up that includes a LT230 but not all come with the 1.41 ratio that i would like to fit. That limits my options. So if the gears could be easily swapped then i could purchase a gbox & tbox without worrying what ratio was fitted.

I had a quick look around site but only found complete removable and replacement of LT230.

What do you guys think? Can an able bodied mechanic achieve this?

Finally, does the defender 90/110 LT77 boxes suffer from the same mainshaft failure as that of its Discovery sibling?

Thanks.

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It's more hassle than it's worth to swap the internals of an LT230, you're just as well buying one complete - after all, you'd probably have to buy a complete one to get hold of the gears anyway.

Re: mainshaft failure, I believe it was early R380's that suffered most - it depends on the gearbox number suffix, the later it is the stronger it is give or take. Apart from the shift mechanism and minor ratio differences there's no difference between a Disco LT77 and a Defender LT77 of the same year strength wise.

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probably worth considering putting a disco box on instead with 1.22:1 - you won't notice much difference with 1.44.

I had my 1.6 box reconditioned once, and the place that did it dropped in a 1.4 without realising - I didn't notice at all! only found out when I went for the 1.22 upgrade.

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probably worth considering putting a disco box on instead with 1.22:1 - you won't notice much difference with 1.44.

I had my 1.6 box reconditioned once, and the place that did it dropped in a 1.4 without realising - I didn't notice at all! only found out when I went for the 1.22 upgrade.

It's the transfer gears you need to change in the transfer box to change the ratio. Not hard at all. You will need to get a new crush tube to get the correct preload on the new transfer gears, but other then that easy as.

I was going to do this myself as I had a 1:1.410 box and wanted a 1.1.222. Luckly I found a 1:1.222 on ebay for less than the 235quid it wpould have cost for the transfer gears.

I rebuilt the 1:1.222 and kept the 1:1.140 just in case it's too leggy

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What size have you got now, and why not?

Hi,

I am running 7.50. Meant to say 285/75 16. I hope to put 265/75 but i know this isnt much improvement over 7.50s.

The problem is that where i live the legal top speed is 40mph! There is quite a bit of hills. Thereby 1.667 is a bit low, I would think that 1.2 is too high. I might consider a 1.2 for my LW hybrid but not for my 110.

Also second hand spares are like hens teeth. All LRs here are imported and continue to live hard/long lives and hardly any are broken up. Thereby my reasoning for changing the gearing as opposed to changing the box. I am hoping that companies like Ashcroft would have some good used ones knockin about that they changed out to disco 1.2 from 1.41.

This would be much cheaper/easier to ship.

Any other thoughts/ideas?

Cheers.

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My thoughts are that if you drive legally at the stated max speed, I would not shift the transfer. But if you don't care about the speed limit... ;)

40 mph is about the slowest you can drive in 5th with a 1,41 transfer. Any hill and you'll have to shift down.

My thoughts after having shifted the 2,5 n/a to a 200Tdi and 1,67 to 1,41. :)

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Some days i am in a bit more of a hurry more than others!!

Seriously, 40mph for some reason seems to make the 110 seem like it is overreving, so hopefully a change to

a 1.4 will make these times abit more hospitible.

A mate of mine has offered me a set of 285/75 16 tyres at a great price. Almost too good to turn down. I

had originally thought that it was definitely not a route i wanted to take, I was looking at 265/75 16s.... But the price is very pleasing.

What do you guys think? It would help with the high reving issue temporarily. I hardly use the 110 off road these days so will suffer the higher low range.

It will make the speedo read wrong. How do i counteract this?

I take it the wheelarches will allow this size tyre?

Look forward to your ideas.

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