Diff ratio matters..

**94defenda** · 16th January 2009, 06:51 PM

Hi all,

Im looking to fit bigger tyres on my 94 defender, 130, 300tdi and was looking at changin gear ratios back to standard. transfer case seems like an expensive option (for an apprenctice) and i'm now looking at diff ratios. i'm in the process of rebuilding the rear salisbury and already have new bearings. can anyone tell me wat is involved in changing diff gearing and who is a good supplier these?

Cheers, Tim

**PAT303** · 16th January 2009, 07:32 PM

How big a tyre are you fitting?.Just going to a 33'' needs no mods and is just about right on a defender. Pat

**discowhite** · 16th January 2009, 07:56 PM

what pat said!
33's will be fine, ie 285 75 R16 and 255 85 R16 sizes are close to 33''

cheers phil

**Bush65** · 17th January 2009, 11:15 AM

Salisbury is similar to dana 60, so a lot of ratios are available. There is some difference between metric and imperial bolts. There is a particular ratio where the thickness of the crownwheel changed, which puts the flange on the carrier in a different position.

You will be limited however by few ratios available for the front rover diff - unless you fit landcruiser diff centre in the rover housing.

**Reads90** · 17th January 2009, 11:24 AM

Unless you are think of running 35" plus i would not bother.
But if you were then you would be best of with 4.1 ring and pinions ratio to replace the one you already have.

There are lots of people who make them in the Uk from Ashcrofts to Kam. All the winch challenge boys use them.

I had a 90 with heavy duty 4.7 ring and pinions

**94defenda** · 17th January 2009, 02:13 PM

Thanks for the replies guys,

I was pretty keen on running 35" on it but i'm not yet sure they will fit. i only went a dobinson 2" lift on the suspension to avoid changing shafts, radius arms etc. i have been told they will fit but i'm not sure what ofset i would need. the 4.1 sounds like the go. do you thing i will be able to use the new bearings i've bought if i change the gears?

Cheers, Tim

**Reads90** · 17th January 2009, 02:50 PM

Originally Posted by 94defenda

Thanks for the replies guys,

I was pretty keen on running 35" on it but i'm not yet sure they will fit. i only went a dobinson 2" lift on the suspension to avoid changing shafts, radius arms etc. i have been told they will fit but i'm not sure what ofset i would need. the 4.1 sounds like the go. do you thing i will be able to use the new bearings i've bought if i change the gears?

Cheers, Tim

This is my old 90 . It has 35" tyres on here All i had was OME coils and shocks, Which is a 2" lift and no body lift.
All i had to do was trim the corners of the wheel spats

**PAT303** · 17th January 2009, 03:53 PM

Mate just throw a set of 255 bighorns on it.Cheap easy and the best muddy on the market. Pat

**94defenda** · 17th January 2009, 05:32 PM

top lookin truck mate. what engine did it have in it? did that have the 4.1 gears in the diffs? what offset were you running in your rims?

Cheers, Tim

**94defenda** · 17th January 2009, 05:33 PM

Originally Posted by PAT303

Mate just throw a set of 255 bighorns on it.Cheap easy and the best muddy on the market. Pat

thanks mate. is that in equivalent 35's ya reckon?

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