Member Since: 03 May 2024
Location: East Sussex
Posts: 2
Transmission swap
Hi all,
I have a Discovery 3 6 speed auto,
While i'm more than happy with it, i've had it 10 years and has never let me down.
I am often asked why don't i get a newer car as i've had it so long ?
Honestly there's nothing i'd want to change it for except possibly and 8sp D4.
So my question is has anyone been silly enough to swap out the 6 speed for an 8HP one ?
3rd May 2024 1:09 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10652
Why?
I got an 8 spd jag and as you pull away slowly, it spends most of its time shifting up the gears until it gets to 4th at 30 mph
Well seams like it anyway.
3rd May 2024 1:56 pm
DIY Ace
Member Since: 06 Feb 2019
Location: Hampshire
Posts: 971
There are a lot of us silly people on this forum, but I doubt any so silly as to try that
..!
That said, someone always needs to go first, so do let us know how you get on 2022 BMW i4 M50. Bought Oct 2022. 10,200 miles and counting...
2014 BMW 435d convertible. Bought July 2021. 58,000 miles and counting...
2005 Discovery 3 HSE Auto. Bought Feb 2019. 169,000 miles and counting...
2009 Freelander 2 XS Manual. Bought Sep 2013. SOLD Aug 2021 (already regretted!)
Member Since: 03 May 2024
Location: East Sussex
Posts: 2
If no-one has done it before, for the sake of some labour I may have to be the first.
I can't see any mechanical issue with why it wouldn't work but possibly a programming one where the car can't see 7th & 8th and won't show on the dash when in manual mode.
My car is a late D3 so it may have the necessary software to cope with it.
I'll leave it a while to see if anyone is as warped as I am and commented on their experience and if not may just give it a go, i've got a spare 8HP to try.
3rd May 2024 2:14 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10652
I think the CANBUS speeds is the biggest worry.
And maybe the 8 spd had the round gear selector knob
3rd May 2024 5:38 pm
loanrangie
Member Since: 18 Jun 2017
Location: Melbourne
Posts: 693
Christophe2009 wrote:
If no-one has done it before, for the sake of some labour I may have to be the first.
I can't see any mechanical issue with why it wouldn't work but possibly a programming one where the car can't see 7th & 8th and won't show on the dash when in manual mode.
My car is a late D3 so it may have the necessary software to cope with it.
I'll leave it a while to see if anyone is as warped as I am and commented on their experience and if not may just give it a go, i've got a spare 8HP to try.
Its not the labour thats the problem, getting the trans to talk to the different CANBUS speeds, swapping into a D4 is possible and is being done here in AUS.
Physically it will bolt in but everything else is where the work including adapting a suitable shifter.
I would do it myself if it could be done easily.
5th May 2024 12:13 am
Scuverly three
Member Since: 23 Jun 2023
Location: Cornwall
Posts: 8
Maybe possible with Cantcu 8HP is being fitted to everything these days and is a much nicer and stronger box than the 6HP.
10th May 2024 8:35 am
Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
"stronger" ? well, the 6speeds are doing their jobs fine in the heavyD3/4 really i see no reason regarding durability tbh...
let not create a hoaxBest regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
10th May 2024 9:32 am
loanrangie
Member Since: 18 Jun 2017
Location: Melbourne
Posts: 693
It can handle up to 1000nm of torque so i'd take that as being stronger than ZF6.
10th May 2024 10:50 am
Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
suc6 creating that with a discovery D3/D4
really i don't see the point regarding "need" vs "strong " for a Discovery D3/4
only "in te pub" maybe... "i have the strongest"! whoah.. a "mine is bigger" league
but he, i am dutch.. quite direct sometimes.. don't take it personally Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
10th May 2024 11:13 am
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5018
Welcome back Harold! yµ (idµ - eAµ) ψ=mψ
10th May 2024 12:01 pm
Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
Thnx Profsr! Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
10th May 2024 11:17 pm
Scuverly three
Member Since: 23 Jun 2023
Location: Cornwall
Posts: 8
[quote="Motolab"]"stronger" ? well, the 6speeds are doing their jobs fine in the heavyD3/4 really i see no reason regarding durability tbh...
So I guess you have never heard of the ZF6 with the juddering convertor or losing gears and worn input shafts and casings????
11th May 2024 9:54 am
Nc1989
Member Since: 28 Apr 2015
Location: Doncaster
Posts: 212
3 Discos and an L322 Range Rover here with a combined mileage of over 700k on their original 6hp’s, one common denominator - they’ve all been well serviced. No shudder, no worn casings etc etc. No doubt I’ll be in a minority of 1 but always found the 8 speed to be a fussy pain in the box in any application I’ve driven it in.
11th May 2024 4:30 pm
Scuverly three
Member Since: 23 Jun 2023
Location: Cornwall
Posts: 8
Yes you are bang on .... dead right you are in a minority of one! You are the first person I know of who have prefered the ZF6 to the ZF8. The 8HP as the smoothest of changes usually only noticed by watching the tacho and makes a much better job of keeping any engine in its most effecient torque band. The 8HP is one of the reasons late D4's are quicker and more economical.
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box in any application I’ve driven it in.
