Auto conversion

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Originally Posted by Slunnie

Good question. Here are the ratios. I also run these on 34"35" Simex. I've not ever had a gearing problem with these ratios or needed lower than L1, but thats not to say that there isn't better ratios out there. For engine braking the ZF4HP22EH locks up in all gears in low range in overrun, so this definately helps, and then I just supplement with the brake as needed. The 4HP22 does not do that.

ZF
1 2.48 (12.33/33.84)
2 1.48 (7.36/20.19)
3 1.00 (4.97/13.65)
4 0.73 (3.63/9.96)
R 2.09 (10.39/28.51)

LT230
H 1.21
L 3.32

Diffs
4.11

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Does the ECU tell it to lock the gears up - or something along them lines?

Do you find that you need to use the brake much, or only on some areas - eg Lithgow?

Thanks mate

Chris

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Originally Posted by cewilson

Does the ECU tell it to lock the gears up - or something along them lines?

Do you find that you need to use the brake much, or only on some areas - eg Lithgow?

Thanks mate

Chris

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There is an EAT ECU (auto computer) on the 4HP22EH which tells it when to lockup, you can buy these as standalone units from Dave Ashcroft (as you keep throwing more money at the conversion) and it will tell it when to lock up. AFAIK it would need a TPS also.
Ashcroft Transmissions

In terms of using the brakes... I don't pull it back down through the gears very often at all, only when there is a lot of braking to do when on or off road. I do pull it back coming down off Scenic hill and only need to use the brakes lightly twice which is coming into the sharper RH about 1/3rd of the way down and again about 2/3 of the way down coming onto the sweeping LH just after the memorial. This said, I'm not on the road to stuff around and the Disco does have ACE. :D The auto will never match the manual for engine braking, but they're not that bad... you still need to supplement the engine braking with foot braking, you cant purely rely on it like you might with a manual. I also run 33's on road.

With my low range I find I often have to accelerate down hill as I am going half the speed of everyone also or slower:twisted:.
Been told my low range is 72-1
Over all engine breaking is great with the TD5.
Please note my gearbox is nothing like a standard box these days.

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Originally Posted by George130

With my low range I find I often have to accelerate down hill as I am going half the speed of everyone also or slower:twisted:.
Been told my low range is 72-1
Over all engine breaking is great with the TD5.
Please note my gearbox is nothing like a standard box these days.

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Did you regear the ZF or do you have 49% gears and 4.11's or something??

Quote:

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Originally Posted by Slunnie

Did you regear the ZF or do you have 49% gears and 4.11's or something??

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The reduction is in the transfer low range. It was done by Bruce Davis using Maxi drive gear. I believe the diffs are standard ratio.
Auto is normal gears but the clutch packs extra clutches and are extra thick. Valves have been upped. Oil pick up is now a custom jobbie. Torque converter was 3000 stallie but when I had it rebuilt we had then dial it back down to 2400 lock up with again as much beefing up as they could.
I have been told there is nothing more that can be done the box so the list above is what I know and have had dealings with.