Thread: LT 95 low range gears.

I recall phoning Mal Story ( Maxi Drive owner) when I had a stage 1 about 12 years ago & asking that question & he said "you already have them"
I can't find the catalogue now- sorry.

The drive line on a 101 shows you how to do it.
You cannot get lower low range gears and the answer is you all ready have them.
A 101 landrover has something like 76 to 1 low low on 35/36 tyres using early range rover transmission.
the 101 diff ratios are 5.56 to one and that gives you the effect of crawler type transfer case.
There are plenty of options to gear up high range, like overdrives and higher ratio high range gears.

Thanks Ron & Deejay. Its in a perentie 6x6 built into a camper. The auto box is a bit high in first though top good for cruising. Low range runs out of grunt in sand. 4.7 diffs and I dont want to change them and lose my top end. Looks like i,ll have to live with it.
Cheers.

Originally Posted by 123rover50

Thanks Ron & Deejay. Its in a perentie 6x6 built into a camper. The auto box is a bit high in first though top good for cruising. Low range runs out of grunt in sand. 4.7 diffs and I dont want to change them and lose my top end. Looks like i,ll have to live with it.
Cheers.

Which Auto do you have??? There LT95 is a 1-piece box and t-case - there are a few rangie auto conversions I am aware of, but none that would stand up to a 4BD1T...

you have 4.7:1 diffs and 3.32:1 t-case - what is the first gear of your auto?

Its a long story, I built it about 12 yrs ago . It had no donk so I put a 6.5 chev diesel with a turbo 700 auto with the lt 95 trb transfer in it. The 700 ratios were good but the box let me down , so put in a 4L80E manualised. They told me the high was lower and the low higher but I hadnt realised how much difference it would make. I dont know the ratios off hand but I probably would have been better off with a 4BD1t and a remote change Isuzu box with the Lt95 transfer behind.

Originally Posted by 123rover50

Its a long story, I built it about 12 yrs ago . It had no donk so I put a 6.5 chev diesel with a turbo 700 auto with the lt 95 trb transfer in it. The 700 ratios were good but the box let me down , so put in a 4L80E manualised. They told me the high was lower and the low higher but I hadnt realised how much difference it would make. I dont know the ratios off hand but I probably would have been better off with a 4BD1t and a remote change Isuzu box with the Lt95 transfer behind.

123rover50, how did you manage to lay your hands on a perentie, or is it the one that was damaged and sold off as mentioned around here somewhere?

Have you posted any pics of it I can have a look at, as I'm sure I'm not the only one who would be very interested in this vehicle. I have a civvy 6x6 and would like to see the differences beyond the obvious.

As for the gearing issue, I have seen this done but don't recommend it unless its done well.

The LT95 transfer box, has equal spacing between input / intermediate / output shafts (115mm), so all gear sets in there will work in any position. The unit in question had the normal constant mesh set replaced with another set of low range gears, machined to fit onto the existing hub and shaft with adaptors and a lot of cap screws, pins and locktite. The centre diff housing had been machined slightly to clear the larger gear.

I calculated the ratios as: High 1.1128 (0.9962 gears) and Low 3.8518, giving a 16% reduction in low range.

Given the cost of getting it all machined its probably not worth it, I'd say this one was done as an experiment, but it was really well done.

Given the LT95 transfer box has 230mm spacing, same as LT230, means it may be possible to use these gears as well, opens up a real "can of worms"

If I still have the gears and I can find them in my shed I'll post up some pics.

Lyle.

Originally Posted by 123rover50

Its a long story, I built it about 12 yrs ago . It had no donk so I put a 6.5 chev diesel with a turbo 700 auto with the lt 95 trb transfer in it. The 700 ratios were good but the box let me down , so put in a 4L80E manualised. They told me the high was lower and the low higher but I hadnt realised how much difference it would make. I dont know the ratios off hand but I probably would have been better off with a 4BD1t and a remote change Isuzu box with the Lt95 transfer behind.

The 4L80E should have 2.48:1. Which gives you ~38:1. I would have thought that would be just sufficient, but I suppose you have a VERY heavy beast!

I think your easiest options would be:
(1) tweak the engine to compensate (or fit a 4BD1T )
(2) fit a front salisbury, and swap to 4.88:1 / 5.13 / 5.38 / 5.86 ratios.

Thanks Isuzurover and Sparkie.
I bought the chassis and axles and cab off a bloke in Sydney who bought them new at a JRA auction and didnt finish his project.
The axles I have posted on here before trying to determine what they are.
The forum decided they are Borg Warner diffs and we are not sure on the difflocks as they have the same actuator as the centre diff.
I tried to put a photo of the truck on ,but as it is already on under "The grey box of evil." it would not upload again.
Its a Forward Control and weighs around 4 tonnes, we get about 4 to 4.5 K,s per litre.