Selectable 4WD in LT95

**Lotz-A-Landies** · 18th October 2007, 04:13 PM

Hi guys

I just thought I would post an interesting thread. A little bit third hand as it came from the S2C UK via the Land Rover 900 Club (1-Tons, Forward Controls & 101s) Forum. but here is the transcript.

http://900club.19.forumer.com/viewtopic.php?p=2441#2441
This is a basic rundown of the selectabel 4wd conversion for the LT95 which I was given by a series 2 club member who uses this arrangement on his IIA FC.

I did this conversion a couple of years ago when fitting a Perkins 4236 and an LT95 gearbox to my 2A forward control.
First you need to dismantle the centre diff.
Discard the 4 bevel pinion gears.Place the rear side gear and cross shafts back into the rear diff casing(with some sort of spacer to fill the gap between them )and weld all 3 bits together in situ (so you can still remove them of course).This then forms your drive and support for the rear output shaft.
The front output shaft needs supporting with a bearing so it can rotate independently to the diff casing.You need a bearing of the following sizes 72mm OD 35mm ID 17mm wide.The front side gear then needs machining to fit inside the bearing and the front diff casing need a small ammount machining out for the bearing to be a press fit into place.All held with Loctite.
Reassemble it all and you have Part time 4 wheel drive!
To engage 4wd you just operate the vacuum diff lock knob.
Also you can now have hi or low ratio in 2wd or 4wd.
I know this all sound really complicated so I will email you some pics that will really help to explain it all.
Good luck if you go for it.It has given me a really strong gearbox
in my Forward Control that is well up to the job.
regards
Richard

These pictures were also included;

[/quote]

**scrambler** · 18th October 2007, 04:43 PM

Why would you do this? Additional strain on the rear drive members, and as for "also you can now have high or low ration in 2wd or 4wd"

you could always have high or low ratio, centre diff locked or unlocked which is functionally the same.

I know we've had the discussion re LT230 conversions (where it's possible there is a reason for the conversion to exist in the first place) but LT95 is a dedicated 4wd gearbox and this amounts to throwing welds in places where they never should have been, additional bearing etc for the dubious "benefit" of transferring all the drive to one axle when the gearbox and drivetrain are designed to take it through 2.

IMHO the engineers, and the MOD for that matter, knew what they were about when designing the LT95 for the 101FC and if putting one in a 2aFC I'd be sticking with the FT4WD

**Lotz-A-Landies** · 18th October 2007, 05:01 PM

Originally Posted by scrambler

Why would you do this? Additional strain on the rear drive members, and as for "also you can now have high or low ration in 2wd or 4wd"

you could always have high or low ratio, centre diff locked or unlocked which is functionally the same.

I know we've had the discussion re LT230 conversions (where it's possible there is a reason for the conversion to exist in the first place) but LT95 is a dedicated 4wd gearbox and this amounts to throwing welds in places where they never should have been, additional bearing etc for the dubious "benefit" of transferring all the drive to one axle when the gearbox and drivetrain are designed to take it through 2.

IMHO the engineers, and the MOD for that matter, knew what they were about when designing the LT95 for the 101FC and if putting one in a 2aFC I'd be sticking with the FT4WD

I only posted the info, because it is interesting.

Regarding the engineering the 101 F/C has CV joints in the front end where the big issue for the Series LR 1 Ton and the Series LR Civilian 109/110 F/C is that have Spicer uni joints not designed for constant 4WD and their weakest point.

The LT 95 can not be any weaker than the original Series gearbox.

Diana

**andrew e** · 18th October 2007, 06:16 PM

Can this also be done to the LT230? Would it be possible to have front wheel drive only instead of rear only? In 4wd competition this is a major advantage decreasing the turning circle.

Andy

**Blknight.aus** · 18th October 2007, 06:24 PM

as lotza suggested...

If you were putting the lt95 into the series (exluding stage 1) type rovers you would want to do this mod IF you were too cheap to put in toughened CVs axles and diffs up the front.

If you had the 8HA at the rear youd be laughing however with a stock rover diff at the back welll you can imagine the carnage given the types of donks that usually sit in front of the lt95's

**rovercare** · 18th October 2007, 06:30 PM

Originally Posted by andrew e

Can this also be done to the LT230? Would it be possible to have front wheel drive only instead of rear only? In 4wd competition this is a major advantage decreasing the turning circle.

Andy

1. Yes and 2. No

**Lotz-A-Landies** · 18th October 2007, 06:31 PM

Originally Posted by andrew e

Can this also be done to the LT230? Would it be possible to have front wheel drive only instead of rear only? In 4wd competition this is a major advantage decreasing the turning circle. Andy

Andy

It can be rear wheel drive and costs $495.00 for the kit from 4WD Systems in South Australia. tom@4wdsystems.com.au

The following was the response to an inquiry to 4WD Systems:

"The conversion kit is a bolt in kit that changes the 'centre diff' to a rear drive only - until you engage the normal lock-up mechanism in the transfer case.
In your vehicle I am not sure if this is but lever or pull knob or ??.
But whatever it is it becomes the 4wd engagement mechanism.
Free wheel hubs come in the kit - what front axle system do you have. These fit defender."

You would need to talk to them whether it can be reversed for front wheel drive, although you would want some pretty tough diffs up front for competition.

Diana

**Bush65** · 18th October 2007, 07:15 PM

Originally Posted by andrew e

Can this also be done to the LT230? Would it be possible to have front wheel drive only instead of rear only? In 4wd competition this is a major advantage decreasing the turning circle.

Andy

I have an LT230 apart at the moment and just had a quick look. It appears possible to make it so you can select front wheel drive or 4 wheel drive.

Edit. Sorry my bad. This can't be done because the diff lock locks the front output shaft to the centre diff housing.

**rovercare** · 18th October 2007, 07:21 PM

Originally Posted by Bush65

I have an LT230 apart at the moment and just had a quick look. It appears possible to make it so you can select front wheel drive or 4 wheel drive.

How do you propose it??, I've mainly repaired LT95s and the locking dog makes it so its either rear wheel or 4 wheel, front digs can be done with constant but the centre diff wouldn't last long

**Bush65** · 18th October 2007, 08:05 PM

Originally Posted by rovercare

How do you propose it??, I've mainly repaired LT95s and the locking dog makes it so its either rear wheel or 4 wheel, front digs can be done with constant but the centre diff wouldn't last long

I have just edited my earlier post to say that it is not possible. Sorry I was too hasty.

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