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Sandbox

Member Since: 19 Mar 2014
Location: Abu Dhabi
Posts: 19

1997 Defender 90 V8 Petrol 50th Auto Atlantis Blue

Upgrading NAS ZF gearbox

I spoke to RPi Engineering yesterday and one of the topics we covered was the fact that the 90 i'm going to look at has a ZF gearbox... but my model adopted it from the RRC so it's purely mechanical and not controlled by the ecu.

Chris mentioned it was a worth-while upgrade moving to the electronically controlled shift option, can anyone elaborate as to what is needed?

I will call him back regarding this but I was hoping someone could tell me a little more.

19th Mar 2014 10:07am

Sandbox

Member Since: 19 Mar 2014
Location: Abu Dhabi
Posts: 19

I thought this might be a bit of a long shot

19th Mar 2014 6:21pm

RustyM

Member Since: 28 Oct 2013
Location: Africa/The Med
Posts: 222

2016 Defender 110 Puma 2.2 XS CSW Corris Grey

Hi,

Not sure which box you are referring to as DAF use ZF gearboxes also.…..... I know the ICON Defender uses the ZF HP 22 & 24 auto box options is this what you are referring to?

M 90 & Wolf
110 XS
Previously owned SI SII SIIa SIII & Light weight (air portable)

19th Mar 2014 6:59pm

Grey110

Member Since: 20 Jun 2012
Location: Delft
Posts: 35

Have a look at the ashcroft site.

http://www.ashcroft-transmissions.co.uk/automatic-gearboxes.html
And
http://www.ashcroft-transmissions.co.uk/de...-kits.html

Looks like you need a ZF4HP22EH and you have a ZF4HP22? Martin

Previous 2003 Defender 110 Hardtop TD5
2004 Defender 110 Station Wagon TD5 - Libyan Sand
2005 Discovery 3 - V8 - Black

19th Mar 2014 11:41pm

tazmarkuk

Member Since: 24 Jan 2012
Location: Birmingham
Posts: 134

Hi Sandbox, this will be the same set up a Discovery 2 auto, personaly I would stick with the non electrical version as it would be more reliable, Disco 2 have a switch on the side of the gearbox called xyz switch, then an ECU which would also need programming, very expensive , however the xyz switch are prone to playing up, very easy to repair, so no need to buy a replacement, but are a pain to re-place in the exact same spot as they need to work correctly with the positioning of gear selection. Hope this helps

20th Mar 2014 7:15am

diesel_jim

Member Since: 13 Oct 2008
Location: hiding
Posts: 6037

if you could mate the engine & box together, then the Mercedes E class gearbox (the 722.6 version) is a lovely unit.

5 speed (forwards) 2x reverse too. has summer/winter settings (makes it pull away in 2nd and doesn't rev as high).

There's a chap in Germany who makes a compushift type thing for this box so it works as stand alone (but this box can also have engine sensors on it to make the gearchanges more smooth), you can plug a laptop in and change the settings, or use the little dash joystick and toggle through the menu on a small LED screen.

you can also fit flappy paddle switches too!

20th Mar 2014 8:43am

Sandbox

Member Since: 19 Mar 2014
Location: Abu Dhabi
Posts: 19

I definitely don't want to be putting a mercedes gearbox in the defender.

Thanks for the info Grey110 and everyone else.

20th Mar 2014 11:50am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7688

2011 Defender 110 Puma 2.4 USW Stornoway Grey

it will he an HP 22.

you can upgrade it - different TC or get Dave A to fit the larger P38 oil pump etc with an HP22/24 amalgamation.

personally i would stick with the non ecu one you have. compushift is excellent, we had it on Philons TD5 Croatia vehicle, you can change just about everything. we had no issues with it but personally i prefer the std boxes.

i run two hp22/24 amalgamations, one with 4.6TC the other the 4.0TC. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

20th Mar 2014 9:01pm

100inch

Member Since: 15 May 2012
Location: Brunswick
Posts: 407

2010 Defender 110 Puma 2.4 CSW Santorini Black

I just getting my 90 50th V8 upgraded with a 5.2 engine and will replace the automatic gearbox as well. Ashcroft got an upgraded version of the ZF with bigger convertor available without the need for Compushift. m

24th Mar 2014 9:40am

Sandbox

Member Since: 19 Mar 2014
Location: Abu Dhabi
Posts: 19

Have you got a link to their website/gearbox?

24th Mar 2014 9:57am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7688

in addition to my above post, forgot to say that both the boxes i run are non electronic boxes. known as ashcorft Monster box HP22/24 amalgamation. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

24th Mar 2014 11:15am

100inch

Member Since: 15 May 2012
Location: Brunswick
Posts: 407

There:
http://www.ashcroft-transmissions.co.uk/au...4hp22.html

Saying that you better be not in a rush. They are very slow to deal with......
But I am sure this will sort your car the easiest way.m

24th Mar 2014 10:26pm

-[Allan]-

Member Since: 22 Mar 2014
Location: West Yorkshire
Posts: 44

2013 Defender 90 Puma 2.2 CSW Cairns Blue

I would keep the standard mechanical ZFHP22 that is in the 50th. It works very well with the Rover V8.

Why do you want to change the gearbox anyway?

If you are upgrading the power on your V8 then the Ashcroft ZF4HP22EH heavy duty conversion is all you will need and even then is not absolutely necessary.

26th Mar 2014 3:18pm

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