low range question/help

Hi all sorry for this possibly long widned question but I'm just after some help.

Low range: gives you more torque (engines turning capability? Am i right?)
at slow speeds...but doesn't wheel spin occur when the torque input out weighs the available traction the tyres have with the ground? So why do you need more of it? I know the engine has an easier time turning the gearbox when it's in low range and that helps to get over obstacles like the small chainset gear on a mountain bike but if you have more torque won't you have wheel spin?

(I must sound like a right novice haha I do appoligise)

I also need some help with gear ratios.... for an example if you have a ratio of 2:1 that means the drive shaft turns twice.for the driven wheels to make one full turn? So the bigger the first number the lower the ratio and slower you'll go?

The image below are the ratios for a Suzuki Jimny.
Going off the third set of ratios from the left, at the bottom it has transfer gear ratios..high is 1.000 and low is 2.002....

How do these two affect the over all gear ratio...for example 1st gear 4.425 what does the high ratio and low ratio from T case do To this?

I do apologise and whatever you can answer I will be happy with...
thank you.

I'd use the transfer box ratio as a multiplier to get the new gear ratio for instance gear ratio of 4 and low transfer ratio of 2.5 would mean 10 revolutions of the engine in low

Low box gives better decent control and more drivability on obstacles. I see what your saying about being easier to make wheel spin but In my mind the lower ratio means there isn't a sudden massive increase in applied power at the wheels which would break traction, it's more gradual due the gearing involved.

I may be talking b******ks though!

Thank you mate that is starting to make sense. So given that first gear in High range is 4.425, when low ratio is selected this ratio is times'd by 2.002 to give a ratio of 8.858.... the engine has to turn almost 9 times for a full revolution meaning the car is crawling very slowly..with the ability to SLOWLY crawling over and through stuff making use of all available traction the tyres have.

Would this be why using no pedals and just applying gentle amounts of power/torque when needed is beneficial which will minimise wheel spin

Dave.

In a Jimny you will struggle to spin all 4 tyres in any gear other than 1st low. So breaking traction isn't so much of an issue. Also, wheel slip is beneficial in many situations, so don't think of breaking traction as an enemy. The lower the gears, the higher the torque at the wheels, so you can get more power to the ground at lower speeds without having to slip the clutch.

The best way to get your head around it is find a few hills and muddy bits and see for yourself!

How come It's hard to spin the wheels when not in first? Sorry I'm trying to get my head around it all. What's the benefit of wheel slip?
I wish I could mate, unfortunately I still do not have my own jimny yet but it's in the pipe line and doing A LOT of research in the mean time.hence the questions Cheers.

Major benefit of tyre spin is to keep the tyre tread clean of mud. This of course only applies when driving in muddy conditions. For rock crawling you best need to avoid tyre spin for maximum traction.

Why it's hard to spin the wheels when in higher gears? Isn't that pretty obvious? Lack of power