low range gears

Transmissions, Transfer Boxes, Axles, Drive Shafts
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hugejp
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low range gears

Post by hugejp » 19 Apr 2017 23:06

Is there anyone locally who could make this line of gears for us???

http://www.marks4wd.com/partfinder/prod ... egory=1128

I would love some of these, but the Rand & shipping are just a bit wild for me to buy with confidence...

Any wise words out there??
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Re: low range gears

Post by Alex Roux » 20 Apr 2017 06:20

Hi JP

The only people I know of in SA that can supply is Marks4wd.
I was thinking of this some years back, but decided against it after seeing a prop-shaft on a Hardbody snap while driving up an obstacle.
My understanding is that an extra set of lower range gears means that the prop-shaft has to be shortened.
The strain is much more than on the factory spec prop-shaft. And on top of that the prop-shaft being shortened may not be as strong as the original.
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Re: low range gears

Post by SJC » 20 Apr 2017 07:58

Maybe also speak to Ronald at 4x4traction. They import quite a bit of "stuff"....

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Re: low range gears

Post by gupster » 20 Apr 2017 08:21

Hi JP, met a guy a few years ago in Moz who is from Zim and he changed his transfer box to a lower range, something I would love to do. Its Michael and Pat gill from Old Man Emu in Harare. Perhaps email him for more info. gill@zol.co.zw
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Re: low range gears

Post by Dustin » 20 Apr 2017 08:39

Reduction gears replace the gears in the transfer case.
No extra bolt on boxes needed, so the propshaft stays the same length.
It's only if you bolt on a crawler box that the geometry changes.
The torque increases on the drive line, so maybe have the universal joints checked or up-rated to avoid heartache.

I had a set in LR Defender 90 the previous owner had brought in from the UK. Best piece of kit, but very expensive ! :surprised:
You can pretty much idle up and over anything in your way.

I'd love to add at least a 40% reduction set to my Patrol, but the bank says no :lol:
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Re: low range gears

Post by Alex Roux » 20 Apr 2017 08:56

Dustin wrote:Reduction gears replace the gears in the transfer case.
No extra bolt on boxes needed, so the propshaft stays the same length.
It's only if you bolt on a crawler box that the geometry changes.
Personally I would not want to lose the current ratios, but add a lower range box, if it was practical to do, and the drive-train remains equally durable.
The car was designed with an intent - probably with different terrains and applications in mind.
The Rubicon for example generally does not do that well on dunes, because the gear ratios are not suitable. It does extremely well on rocks though.
Skilpad & Shortie

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Re: low range gears

Post by Dustin » 20 Apr 2017 09:45

True.
You have the option to only change the low range gear to a reduction gear and leave the high range gearing stock.

I know a guy who bolted a second transfer case to the back of the existing one on his old Hilux SFA.
A bit too complicated for my liking, but he can alter the gearing considerably to suite any terrain.
He can set it to "Low Low" and jump out of the bakkie and let is walk itself or on the other end of the scale he can set it to "High High" and it runs faster than 2H for sand, and a bunch of combinations in between.
He does run 40" tires, so that was the reasoning for the gearing to turn those huge chunks of rubber.
Mad guy with way too much time and money. Needless to say he's still single :rolling:
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Re: low range gears

Post by Wilkie » 20 Apr 2017 09:59

for the more elderly Patrol fanatics I had a 1968 Ford F150 fitted with a Ford 302 V8 and 4speed +overdrive jaguar gearbox....so I basically had an 8 speed gearbox and could change from 1st low to 1st high by simply pressing the clutch
and then to 2nd low and then to high...
And that was either in High Range or Low range ..That was an amazing combination
Could park it against a tree in Low range 1st gear low and leave the clutch and I will stand outside and look at it eating the folks lawn up :oldtimer: :oldtimer:

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Re: low range gears

Post by davidvdm » 20 Apr 2017 10:40

My setup I am aiming for on the Sani will give me 4.1:1 final low range through two TC's. I am keeping the hardbody box and TC and adding a MQ/Safari TC behind it. In my case the propshaft ends up the same as the the original Safari as my donor vehicle was the LWB and the entire Safari drive train fits in behind my existing TC/gearbox with only the coupling propshaft between the two TC's needing to be modified.

Where you can start breaking stuff, is the additional torque you are now "creating". When I did the gear ratio spreadsheet, I popped in a torque of a mere 200Nm from my little 2.7td, and with both boxes set to LR, I can produce 13000Nm on the side shafts. I get a wopping 26.5 meters per minute crawl speed at idle.

That is one of the reasons I am happy to have the H260 rear end for the Sani. Hardbody and Safari has same OD and wall thickness propshaft tubes, but the UJ's on the Safari a bit bigger.

Now to just get the darn thing installed and make my rig a 4x4 again.
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Re: low range gears

Post by Marino4x4 » 20 Apr 2017 10:48

Terrain Tamer has a transfer case re-gearing kit available as well. The ratios are 1 and 3.561. You need to be an oil Barron though to get these. They are +-R20 000. This is the same cost as with Marks4wd but with all the import cost and duties. Not a cheap conversion. Then you still need to install it.
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