Thread: Discovery/Defender Transfer Box

Just rebuild the D2 transfer case, as the Defender transfer case is geared LOWER.... this is not what u want, unless ur a hard hard core rock climber...

Being a D2 1999 transfer case the side gear shims in the centre diff lock will be either worn down to paper thin or have gone completely, but the shims are included in the Ashcroft transfer case rebuild kit.

Personally I'd add to the parts order the rest of the bits need to put the centre diff lock option back into ur D2, its a case, shaft, cable stick assembly.

Or compare the price and if cheaper go for the Ashcroft auto locker (whatever its called).

While the g/box is out this is the IDEAL time to sort out the Land Rover dumbness of no centre lock option.

Jump under ur truck, being a 99, it should have all the inside bits and just need the cable assembly, so you are looking for a "stud" like threaded bit on top of the centre diff part, stick ur hand between the front output shaft and gearbox, feel with ur finger a small threaded bit on the top of the diff case.

Regards
Daz
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After reading it your post the second time and realising I had it all mixed up (the above is good info for some, just unrelated to OPs question).

Ok, being a TD5 Defender, if u run no larger than 31' tyres then yes you will gain nice on hiway drop in revs if you use the D1 high range gear set, but if you run what I call "Defender tyre size" as in 235 85/R16 then using the Disco high range will make it feel too high geared. Personally I'd strip both transfer cases and use the one with the least amount of wear, which may well be the D1 box (just put the Defender gear set into it). A lot of the wear occurs in the centre gear set shaft (in the actual case) and the lower dog gear set. Its much of a much really when rebuilding though.

Daz,
My Defender is the 99MY. The spare transfer box I have is from a D1 so will have all the diff lock internals.
My problem is I don't know if I want to fit the D1 gear set into my Defender T-Case or rebuild the spare D1 T-Case (with diff lock) and keep the Defender T-Case as a spare.
I think I'm leaning to rebuilding the D1 case so that it's got all the new bearings and seals plus HD cross shaft. That way if I find it's not so good for towing I'll put the original T-Case back in. I think I'll like the better motorway cruising with the Discovery gears though. Should bring my revs down and give me a little better fuel economy.

I have both , but they are both 300TDI's
It is horses for courses , the 130 is a work play vehicle & I would definitely not fit disco gearing to it . The 110 does not tow much & is good on the highway , but on the odd occasion when towing is required I curse the disco gearing .

updated my post with info that might actually be relevant..

Regards
Daz

Originally Posted by DazzaTD5

updated my post with info that might actually be relevant..

Regards
Daz

Love your editing reason! thats useally my reason haha

I'm running 265 75 R16. Not sure what that is in the old stuff. I tow a camper and it's painful on the hills even though It's chipped. So I don't want to make that (significantly) worse.
But on the other hand, towing is a very small part as work gets in the way and I can't get bloody time off so being able to relax a bit on the motorway would be nice.
Decisions decisions!!!!

Personally I can live with a few quick gear changes on the hills , its the hill starts that I don't like .

Originally Posted by dero

Personally I can live with a few quick gear changes on the hills , its the hill starts that I don't like .

You are the right man to talk to.
As you have two essentially the same vehicles what are your thoughts/observations on the two cars in regards to the gear sets.

265/75 is pretty much 32" so same as stock defender, d1 gearing wont help with towing at all but a chipped td5 should be able to compensate.
I want to swap to a defender tc so towing will be better on 32" on my D1.

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