Reduction Gears

[katwoman]

1. What are they, where do they go, how do they work ?
2. What do the % mean ?
3. Will they affect daily driving ? Loss of power, ect
4. Is there another option to slow your descent ?

I would like to hear from those who have them, had them, fit them, sell them or invented them. If you could explain in the least technical way, that would be good.

[BigRAWesty]

1. What are they, where do they go, how do they work ?
2. What do the % mean ?
3. Will they affect daily driving ? Loss of power, ect
4. Is there another option to slow your descent ?

I would like to hear from those who have them, had them, fit them, sell them or invented them. If you could explain in the least technical way, that would be good.

1- they are a reduced gear which replaces your low range gear in the transfer box behind the gearbox.
To be honest the biggest let down of the patrol is its gearing ratios.
When selecting low range in a patrol you really only gain 1 extra gear and second gear low is already above first gear high. (hope that makes sense)
So that's when your percentages come in..

2- the figures your seeing are a percent of reduction. You can't have 100% or you would not move.
85% is quite common in qld as they love rock climbing. But that's not such a great option if you in the high country.
So there are other options to suit your needs.

3- no they won't affect anything when in high range. Except your wallet when purchasing lol

4- reduction gear will aid hill decent to no end. Your engine (depending on what it is of course) will be able to hold the speed down with less force. Same with acceleration, your gears are a lot lower so taking of on steep hills is easier.

Hopefully I haven't confused you.
In sort say your sitting on 50k/h in low range 5th gear. By adding a reduction gear set that speed will be slower in relation to the percentage installed.

Cheers

[macca]

Kallens done a great job of explaining.

I fitted the 43%?? to my manual 4.2, the difference is incredible. Sometimes getting moving in low one was a challenge, no longer.

The mates in cruisers were heading up hills in low two where as I was always in low one, I had no other options so the clutch copped a beating. Decent is more controlled as well.

Reverse is lower too which is a pain at times but not really too much.

Basically the low range half of the box got shifted one gear, two became the old one, three became the old two etc. Most importantly 1 became a lower and much more useful gear.

A whine comes with the gearing upgrade but that's normal and only really noticeable in low four / five.

Hope that makes sense.

[matfew]

not sure what % benne got but he couldn't use 4th or 5th when he was with us in high country as in those gears the whole gearset is spinning to fast and makes a horrid noise. pretty sure he's got the 80% though.

[Drewboyaus]

not sure what % benne got but he couldn't use 4th or 5th when he was with us in high country as in those gears the whole gearset is spinning to fast and makes a horrid noise. pretty sure he's got the 80% though.

Yes, Ben has 85% which is almost too much for high country....someone around here added the custom 65% ones from a group buy and is loving them.
Just thinking, he might have done diff ratios too but can't remember.

Sent from my iPhone using Forum Runner

[MudRunnerTD]

Hi Kat,

Yes as Matt states when Bene was down it was quite apparent that his 85% reduction gears were a real problem for him in our type of terrain. He struuggled with the touring type speed of the high country in Vic. His gears were a little under. Crawling up the hard stuff though was rediculous!!

43% could be a better option and there has recently been a group buy for some custom 63% gears but I think that's done.

I assume you are chasing a little most reduction from your TD42 which is surprising to be honest as in a manual they are pretty good. I would be more inclined to consider a Diff Gear change.

From factory you will have either a 3.9 or 4.1 gear set. Mine is 3.9. I would love to swap out to a set of 4.3s for a great touring and climbing set. This will raise your revs slightly in hi and low but will really make a big difference if your running 33s or 35s. That's where my money will go.

What are you after. Just decent control?

Good luck mate.

[macca]

I assume you are chasing a little most reduction from your TD42 which is surprising to be honest as in a manual they are pretty good.

Certainly not my experience, but with the pod etc mine is heavier than a wagon and 33" tyres are fitted so that could be the reason for our different points of view.

[MudRunnerTD]

Certainly not my experience, but with the pod etc mine is heavier than a wagon and 33" tyres are fitted so that could be the reason for our different points of view.

I am running 35s and have 3.9 gears in the GUIV. It ain't great. My GQ running 35s and 4.6s holds first with no brakes down all but the steepest of steep. Then the odd tap of the brakes gets it done. Running 33s on the GUIV and it's pretty good, 4.3s would be awesome though. I have even thought about going to 4.1s but if I am going to spend the cash the 4.3s would get my money.

Reduction gears will make a dramatic different right through your low range. Changing diff gears make a subtle to big increase in hi and low range. I think swapping diff gears would be better value.

[macca]

There were some 4.3 centres on eBay recently, I will try and find them for you

[macca]

There they are, Sorry about the hijack Kat.

Front diff
http://www.ebay.com.au/itm/111504221...84.m1423.l2649

Big diff??? like mine???
http://www.ebay.com.au/itm/221603178...84.m1423.l2661

A pair
http://www.ebay.com.au/itm/Diff-Cent...3D221603178021