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Gearing

wolf_extreme4x4

Offroader
After having recently fitted a 200tdi into my 90 im not quite satisfied with a top speed of about 70 downhill with the wind behind me, and besides a diesel doesnt sound like it should even be run at that RPM so im looking at fitting RR or disco transfer gearing, so, are RR, disco and defender diffs the same ratio as im not sure whether to change diffs as well.

The only problem thats in my mind is that my old v8 110 hi-cap had RR gearing and it certainly didnt go like a RR, instead it topped out at about 60 as it didnt have the grunt to go any faster but when you change from 4th to 5th it would slow down.
 
Diffs are all same ratio. You need a Disco tbox which will be 1.22 ratio as against the 1.41 or possibly 1.6 of your tbox. The other more expensive but versatile way is a GKN overdrive which has been much discussed elsewhere.
 
I would be checking out the state of the engine, a 200tdi should be able to do 70 comfortably (if a bit noisily) with plenty left in reserve.

Sounds like yours is performing more like a TD
 
Bernie, that depends, if he had a TD in there originally it would be the 1:6 ratio, which would definately make it scream at 60. But you're right, with the standard Defender (200TDi onwards) 1:41, you should be able to noisily do 70.
 
Thanks for the replies, i cant tell what the origional engine was as it has had many different engines.
It is a 1985 model and was fitted with a 4 cylinder engine.

The engine itself runs very well, it isnt down on compression and it doesnt smoke at all.
 
Thanks for the replies, i cant tell what the origional engine was as it has had many different engines.
It is a 1985 model and was fitted with a 4 cylinder engine.

The engine itself runs very well, it isnt down on compression and it doesnt smoke at all.

look at the number on the transfer box, the prefix gives you the ratio from the link i posted.
 
What size tyres are you running, if you've got the original 205R16's then it maybe worth going for 235x85x16's as this will give you about an 11% reduction in your overall gearing.

HoSS, the only 90's fitted with the 1.2:1 ratio T-box were for the US & Japan markets. All UK 90's were fitted with the 1.41:1, except the V8's and these were 1.191:1. ;)

The 1.6:1 T-box was only fitted to the 2.25 & 2.5 petrol 110's.

Here's a good ratio calculator for you: http://www.allfourdrive.com/test/gear.htm
 
Thats what I thought budgie, EXCEPT I was told by my LR place that the 2.5N/A (possibly the TD too) could/probably did have a 1.6:1

But, of course, looking on the transfer box will reveal the real culprit as HoSS says!
 
I looked on the transfer box for the ratio and couldnt see any stickers, where abouts is it usually located
You're looking for the T-box's serial number that's stamped into the casing.
If you match this against the list in the "technical information" link on the Ashcrofts page that HoSS posted then it'll tell you what the ratio is. ;)
 
no need to check serials, the boxes have the ratios on a sticker, well both of mine did.

you'll have a 1.6 transfer box if its been a dieselfor 4cyls generally 1.6 befre defender and 1.4 after. just the v8's that confuse things :p
 
Well I've got a 2.5 N/A 90 1986. I'm assuming from what I have read that it will be a 1.4 or 1.6 ratio.

Can someone tell me exactly where to find the serial number. I was under in the wet before looking, but couldn't find it.

Any hints much appreciated!

I've got a V8 90 outside with a transfer box going spare...from what I have read it will be a 1.19 which would be a convenient swap if I ever find me a 200Tdi lump to drop in...
 
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