Your Thought's / Advise.

[just cruizin']

for what's its worth

Diff gears will correct for tyre diameter

Transfer gears will make it crawl.

[Gwagensteve]

11_evl, my names not Steve , but your crawl is about 76:1 (2.4x6.5x4.88)

That's the raw numbers, but it's actually a fair bit lower in practice - you have a 1.8:1 converter ratio, so under high load or when left foot braking, you have 76X1.8 - 136.8:1

This is pretty much the biggest advantage of an auto - all your gears become flexible and load reactive.

It' also the reason that even at 40:1 or so, an auto is fine, even on big angles and with big tyres.

Steve.

[Turbo Tonka]

i have owned a 1 litre zuk with old series 1 hoppers and 1 litre diffs on 31s,a wt 1.3 zuk with 5:12s on 31s and a wt 1.3 zuk with standard 3.7 diffs and 6.5s also with 31s.

My opinion for the driving that we have here,tighter gullys,big side angle stuff and rock is that the 6.5s are by far the pick(about 87:1)crawl?? Control of the vehicle is awesome with the low gearing and is really beneficial at times.My only problem is sometimes not having enough speed on the odd hill climb without being high up the gears.but atleast there is still options there with gears.

The zuk with 5:12s was pretty good for the $200 i spent getting them and got me by for over a year but wasnt really suited to our terrain and alot of time was still spent using the clutch.I would of liked to go slower.

And the first zuk 1 litre 3.9s and 4.1 case i think was awesome we thought back in the day,it was pretty slow and a big improvement over stock.that was 8 or 9 years ago and was sic
Have driven mates zuks with 33s,6.5s and 3.9s which was pretty similar to my 3.7,6.5s and 31s and another mates who had 6.1(series 3)??,5.12s and 33s.Some times this second one didnt seem to work well with the low gearing especially climbing but i think most of its problem was the super soft bouncy suspension.
It all would depend on the terrain you drive and how you drive.I prefer to go as slow as possible where i can but everyone has a different idea on 4 wheel driving

[Turbo Tonka]

for days out in our local pine forest(more like the driving you melbourne folk do with mud and hill climbs,forestry tracks) i used to spend most the day in high range and just the the extra go the 1.6 efi had to get me along as you are forever in 4th low or swapping in n out of low n hi all day.

[Gwagensteve]

I just crunched some rough numbers and my 3rd low is around 40:1, which is why I use 3rd and 4th low in mud. I get plenty of wheelspeed in those gears, but I have two more for when it's steep. 127:1 is no substitute for a torque converter, but it's close- I can still key start uphill out of anything and I have a line lock to prevent rollback

I might be a crap driver but I couldn't drive the terrain I like to drive @40:1, but I have no qualms clutch dumping on the rev limiter in 3rd low when required

Steve.