LT230 transfer box

[cortina1498]

Hi, I'm seeking advice, will the transfer box from a defender, LT230 suffix 20D with the 1.6:1 ratio be a straight swop for my existing 1.2:1 transfer box on my 1995 discovery 300tdi auto.
thanks in advance
Linda

[davew]

Yes, it should be a straight swap.

Your 1.2 box might be a "Q" suffix in which case you might find the 1.6 a bit noisier. You might find 1.6 a bit low geared unless you're going to put 35 inch tyres on it too.

[Matthews]

Yes but the ratio's won't work , if you're running 235/85/16's you can use a 1.4 but if 205 16 or 235/76 16 you need to stick with the 1.2 (which are the most common and cheapest so if you've go a 1.6 some of the big tyre brigade will snap your hand off as they're difficult to find)
Matthew

[cortina1498]

Hi, many thanks for the info, using 31" tyres according to 'Ashcroft calculator' the 1.6:1 transfer box would give me 21.5mph per 1000 revs
Seeing as I very rarely go over 60mph (2750 revs) I can live with that.
It will certainly stop my gearbox shifting from fourth to third and back every few yards on a hill when I am towing my caravan.
Once again thanks
Linda

[Matthews]

I've tried it and settled on a 1.4, the 1.6 is fine with the 35" Simex's on but too low geared with the 32" normal mud tyres (285/75/16) torque converter was going into full lock up at about 40mph with the 1.6 xfer box.
Matthew