Thread: 200Tdi - Rebuilt - Where to source

A local engineering shop should be able to do the work.

It would still be cheaper than an overdrive.

LRT

The low range is unchanged/stock.
It only modifies high range gearing.

Originally Posted by ashhhhh

The low range is unchanged/stock.
It only modifies high range gearing.

That is physically impossible as you need to move the intermediate shaft on a series to change the high ratio. Therefore the low range intermediate gear is changed, as are the high range intermediate gear and the t-case inpt gear (and high range gear).

So my question was - what is the ratio??? It cannot be exactly the same as original as the gears are changed. Even if it is 0.1 out, as I doubt they could get iit exactly the same.

To say "low range is unchanged" may be accurate if the gear ratio is almost the same, however all the gears in the box are changed apart from one of the low range gears.

Regardless of the ratio, the same applies. You can no longer swap to suffix B gears to get 49:1.

This is the page on the Ashcroft web site - Ashcroft Transmissions - High Ratio Transfer Case Kit.

No mention of any change to the low range gears, in fact it specifically says it stays the same. Can only be done with the larger intermediate shaft though which was 2a and 3.

Cheers,

TimJ.

The 4 Wheel Drives catalogue lists the high ratio transfer case but the catalogue is a bit out of date now. They claimed 1st gear low range STD was 40:1 and after fitting high ratio transfer case 39.5:1 but 31% 'overdrive' in high range.

I got an Ashcroft replacement gear from them for my early small intermediate shaft HRTC last year.


Here is another link to a 200TDi conversion.
Land Rover SIII 200 tdi conversion



Colin

Originally Posted by gromit

The 4 Wheel Drives catalogue lists the high ratio transfer case but the catalogue is a bit out of date now. They claimed 1st gear low range STD was 40:1 and after fitting high ratio transfer case 39.5:1 but 31% 'overdrive' in high range.

I got an Ashcroft replacement gear from them for my early small intermediate shaft HRTC last year.


Here is another link to a 200TDi conversion.
Land Rover SIII 200 tdi conversion




Colin

I am trying to count teeth on the ashcroft kit to work it out. The pics are small which makes it hard.

So far I have:

Ashcroft T-case
T-case input: 31 teeth
High Range: 27 teeth
Intermediate High: 50 teeth (???)
Intermediate Low: 22 Teeth

Does anyone have the tooth counts from a stock series t-case?

Standard series suffix C-on is
1.148:1 High
2.35:1 Low (40.65:1)

Suffix B is 2.89:1 low (48.9:1)

Ashcroft is 0.87:1 high ???
Your numbers above suggests low is ~2.28

EDIT: Looks like my 31:50:27 teeth above is correct as it gives 0.87:1
So low range in an ashcroft box is:
31:50 x 22:[how many teeth on stock low range gear?]

As Tim said, it specifically states that the low ratio is unchanged...I didn't just pull it out of my arse.

Well their product description sounds pretty simple, and it's gonna be a heap better outcome than changing the diffs...


That's what I'm doing anyway!

My C240 powered SIII has a high ratio transfer box. The previous owner didn't have any problems but he did warn me it was a bit slow accelerating at times (mind you the Isuzu motor is more suited to a stationary application!).
If I was doing it myself now, I would weigh up the cost of the HRTC vs a couple of s/h Rangie diffs (in fact the previous owner supplied one with the SIII). You would of course also have to weigh up the increase in the low range gear ratio if you change the diffs.

Mostly on-road probably the diff option, intending to use it a lot off-road then the HRTC option would be a better option.

Best of luck with the 200TDi conversion. The previous owner of mine keeps phoning me up trying to get me to buy a Disco motor he got to fit into the SIII. I want to get it on-the-road first and then consider the issues relating to getting the motor change signed off.



Colin