Isuzu Trooper Owners Club UK™

:::Matski::: · Posted: Fri Feb 09, 2007 16:20 Post subject:

I wonder how you can tell what the diff gearing is on the trooper.

I read that some American troopers had a wide tyre pack with 31" tyres and 4.77 gears.

Indipendantx4 have 5.38 rears but no fronts.

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markymoan · Posted: Fri Feb 09, 2007 16:24 Post subject:

MK1
4.3-1 on a diesel
4.555-1 on a petrol
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:::Matski::: · Posted: Fri Feb 09, 2007 16:39 Post subject:

Ok I am confsed now.

Is that the diff gearing?

markymoan · Posted: Fri Feb 09, 2007 16:41 Post subject:

Yes it is, so it looks like the petrol has a higher ratio than the diesel.
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:::Matski::: · Posted: Fri Feb 09, 2007 16:49 Post subject:

So there is nothing in this country that does the 4.77 diff gears.

markymoan · Posted: Fri Feb 09, 2007 17:02 Post subject:

The book i have is a first edition printed in 1987, so i dont know about the last of the mk1's.
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:::Matski::: · Posted: Fri Feb 09, 2007 17:10 Post subject:

Any one good at maths?

If you fitted gears from a petrol into a diesel diff, what size tyres would you need to go up to to retain the gearing as it is.

What about the bighorns like siwebs what is there diff gearing?

Chris B · Posted: Fri Feb 09, 2007 23:47 Post subject:

This might be worth a peek...
http://www.4x4wire.com/isuzu/reviews/tera/newgears/?
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Isuzu Rodeo Denver Max LE | 265/65R18 BF Goodrich AT LTM No.60

:::Matski::: · Posted: Fri Feb 09, 2007 23:53 Post subject:

Yeah I put a link on for the same product.

It looks very interesting, but I think cripplingly expensive at the same time.

Chris B · Posted: Fri Feb 09, 2007 23:57 Post subject:

Oh yeah... Embarassed

Must be great minds.. Wink

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Isuzu Rodeo Denver Max LE | 265/65R18 BF Goodrich AT LTM No.60

:::Matski::: · Posted: Thu Feb 15, 2007 12:49 Post subject:

Ok I have worked out some figures (maths is not my strong point, so these may well be wrong)

Driving a mk1 2.8td with standard 235/75/15 tyres and 4.3 diffs.

For every 1.071 meter you travel you would travel 1.153 meters with 31x10.5r15 tyres on.

If you fit 4.555 diffs from a petrol mk1 and 31x10.5r15 tyres you will travel 1.088 meters.

So it looks like fitting 4.555 diffs from a petrol mk1 means you can drop the 29" tyres and put on 31" tyres giving 1" of lift under the axles, with minimal change in gearing.

Hard1 · Posted: Thu Feb 15, 2007 12:56 Post subject:

This site might help calculating difference in actual speed with different sized tyres...

http://www.miata.net/garage/tirecalcold.html

I've found it well useful for speedo purposes...
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1999 Cougar with a NICE motor..

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:::Matski::: · Posted: Thu Feb 15, 2007 13:11 Post subject:

I have got that.

It's the diff gearing in relation to the tyre size that I am trying to work out.

Hard1 · Posted: Thu Feb 15, 2007 13:18 Post subject:

Sorreeee...... Rolling Eyes

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1999 Cougar with a NICE motor..

Click HERE to see under my bonnet!

:::Matski::: · Posted: Thu Feb 15, 2007 13:44 Post subject:

Don't suppose you are any good at maths are you Laughing