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LT230: flange to flange measurement


o_teunico

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Yes, I know it. In fact the idea is to use their remote or "divorced" LT230 kit to join a second LT230 to the original one in a Discovery Tdi. This second divorced LT230 will be rotated clockwise to sit full vertical. That will drop output flanges 230mm and this way an extreme 8/10" suspension lift will be possible (+4" coils located under chassis rails) while maintaining propshaft angles as in a standard car.

Adding a second transfer without moving engine/box/tbox from their original location will need a longer front propshaft and a shorter rear one.

If I can manage to fit a second tbox with it´s output flanges sitting 250mm apart from the original one, props will only need to be swapped front to rear.

Second transfer will be from a Defender (1.41/3.32) will compensate for big tyres in high range and low range will be used as "crawler box". Best of all is that, if it works, will be extremly cheap (just a scrap LT230 and a divorced kit) compared to r&p change + crawler box.

Suspension will be changed to a unilink type, front and rear, attaching unilinks to the second trasnfer´s support.

This is the 70mm shorting kit

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This is the "divorced" kit

wpb03d2af2_05.jpgwp061ac2dc_05.jpg

And finally the unilink+second transfer made in a Samurai (Marks Zuki, "stolen" from pirate4x4)

markszuki328090222.jpg

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For gear ratio, we will call the original 1.22 box the "rabbit/turttle" box and the second divorced one will be the "high/low" box.

Rabbit-High: 1.72

Rabbit-Low: 4.05

Turttle-High: 4.68

Turttle-Low: 11.02

If we use two identical Disco t-boxes (1.22), we will loose one gear, because Rabbit-Low and Turttle-High will be the same.

Rabbit-High: 1.49

Rabbit-Low/Turttle-High: 4.05

Turttle-Low: 11.02

In real world I don´t think that there will be much difference from using 4.05 or 4.68 gear.

Turttle-High should be banned via a link bettwen both gear selectors. Rabbit-Low will have same ratio without stressing the second t-box with too much input torque.

There are quite a lot of LT230 gears avalible, so multiple conbinations could be possible.

Of course in this setup the original the original LT230 will be modified to just 2WD. Front wheel drive housing could be used for PTO arrangement in the second box, in the VikingWinch way.

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Have been thinking about gearing...If we use the most different ratios avalible, 1:1 from early autobox rangies and 1.67:1 from N/A 90/110, we will have a rabbit/low and turttle/high different enough to be usable.

Rabbit-High: 1.67

Rabbit-Low: 3.32

Turttle-High: 5.54

Turttle-Low: 11.02

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  • 4 weeks later...

Unless you swap the differential offsets to the left hand side,or mount the first transfercase upside down or back to front, I can't see how you can connect 2 LT230's together to get crawler gears, because you would need to couple the output shaft of the first 230 to the input shaft of the second one.

The reason that double transfercases are possible on mainly US built 4x4's is that most have centred rear diffs,and the transfercases give low and high range at the rear output shaft behind and inline with the gearbox mainshaft.This allows the offset (for front wheel drive) to be on the same side as original.They also usually cut the housing of the first transfercase to remove the front wheel drive output so that it doesn't get in the way of the front output of the second t/case.

LT230's aren't made that way, because the PTO aperture only gives gearbox mainshaft speed which is neither the same as high or low range. You would be best adapting a Toyota Hilux or GQ Nissan reduction box between the LandRovers gearbox and transfercase.

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As you said, a second LT230 will be difficult to adapt.

I have been searching and Mitsubishi L200 and Ford Ranger/Mazda B-50 have rear centered diff and left hand front output. Using one of those will leave the rigth hand clear for a divorced LT230.

Aussie designed and ZA built 2012 Ford Ranger are using the same six speed Getrag MT82 as used in ´07 Defender. Not now, but in a few years they will be avalible at cheap prices at scrapyards and with a 5.4 1st gear + Ford 2.7 low ratio + LT230 3.32 will make an excellent crawling combo, along with Y61 4.1 axles.

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