Transfer box ratios

Unclegussy · Apr 13, 2022

Hello, I have a 1986 90" with a freshly machine-shop refurbished 200tdi mated to a decent LT77. I will not be off-roading or towing 3 ton loads but want better road speed. Should I fit a Disco1 transfer box?

lynall · Apr 13, 2022

Tbh the 1.4 is pretty good at what it does in the 90/110 models, I found the 1.2 was to highly geared and the box effectively became a 4 speed as 5th was unusable a lot of the time, it was okay on fast a roads and motorways, but then it lacked grunt on long inclines, this was all solo running empty.
So in my humble opinion if them tyres in your pic are 235/85 then stick with the 1.4.
A lot depends on the terrain around you and your regular haunts.

Bennehboy · Apr 13, 2022

Ashcrofts do a 1.3 ratio change gearset now too which I think is supposed to be a very happy medium. Obviously needs some mechanical knowhow to fit.

brianp38dse · Apr 14, 2022

Hello and welcome to LZ

DaveM-sport · Apr 14, 2022

I've had 1.2s with 33x12.5s on one of my 110s and it was perfect and that was with alot of towing too.
Fact it was a 200bhp/450Nm TD5 helped however

saxavordian · Apr 14, 2022

TheQ · Apr 14, 2022

I have a 110, 200tdi with the disco box, on 235/80s.
I tow and move up to 1 ton of boat and trailer, up to 25 miles in Norfolk no problem.
I drive up to 200 miles in a single trip, not towing, half "A " road, half A1/A1M, I find the disco box much better, quieter, for comparatively high speed 60-70mph driving. I don't mind dropping to 4th occasionally it's not that. different to being in the old 5th.

Hippo · May 1, 2022

Welcome to the forum

Transfer box ratios

Unclegussy

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lynall

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Bennehboy

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brianp38dse

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DaveM-sport

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saxavordian

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TheQ

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Hippo

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