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how to gear down........


v8bobber
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Hi all,

I recently finished building my trialler which I am fairly pleased with.

The engine, gearbox and axles were lifted from a 3.9 discovery and as such I find the gearing quite high. I have been offered a transfer box off an early diesel 90 (1.4 ratio?) as compared to the higher geared Disco one, and assumed that this would lower my gearing nicely.

However, I have since read in a magazine this evening that this transfer box will only lower the high ratio gearing and will leave the low ratios as they are (if that makes sense?) I can't see it somehow but if someone can enlighten me I would be most appreciative

I was under the impression that that 1.4 ratio t box would lower ALL the gears not just the high ratios ones? :unsure:

Dave

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Thanks for that, i'm glad I asked!

It would have been embarrasing to say the least to spend ages swapping the T boxes over the find that the ratios were exactly the same!!

I appreciate that changing the ring and piniins would lower the gearing, however, I do wonder if there are any specialist companies that make a set of lowered ratio T gears. I feel a search coming on.......

Dave

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however, I do wonder if there are any specialist companies that make a set of lowered ratio T gears.

Yes,there is a chap in Australia who took over from Maxidrive the production of lower ratio gears.

Can't remember his name,but have a look on pirate4x4.com,in the landrover section - they had a group purchase thread running some time ago.

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v8bobber,

what size tyres do you run?

i trial with midwales & PMS & have used a 80" 4.2v8 on 35's & a 100" 200tdi on 750s & i would say that both of them have the gearing about right for the tyre size, if anything sometimes i find the tdi on 750's too low geared & have to go a gear higher than normal, saying that it may be because im sued to running a 90 on 35's,

are you finding it too high geared on climbs or decents?

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