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MJN110

Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380

2016 Defender 90 Puma 2.2 Landmark LE Montalcino Red

Ashcroft higher 5th gear option on R380

Hi
I am planning on installing a replacement R380 gearbox to my 1997 Defender 90 300 tdi.
Should I go for the higher 5th gear option?
I was planning on running the car with 235/85 R16 tyres as it feels to low geared on the standard tyre sizes.
The only engine upgrade I have is a double core intercooler.
Any input would be much appreciated.
Thanks

12th Feb 2017 7:43am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4786

I have the taller 5th on my Td5, with the disco/puma transfer box it makes high speed cruising effortless. I believe that the taller 5th is 5% taller than standard so with a defender transfer box it would make a 150rpm difference at 3000 rpm.

Every little helps

2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
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12th Feb 2017 8:19am

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2173

Yes. Depending on how much power you bav available you may have to shift down on motorway hills. Otherwise excellent.

12th Feb 2017 8:45am

MJN110

Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380

Hi
I would have no hesitation if I had a TD5 as it has more power and torque.

12th Feb 2017 9:07am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4786

I would have thought a standard Tdi could cope with a 5% top gear increase. After all the Tdi is fitted to the disco which is much heavier and has 18% or so taller gearing

12th Feb 2017 9:27am

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

And smaller tyres. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

12th Feb 2017 9:59am

MJN110

Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380

Are the tyres smaller than 235/85 R16?

12th Feb 2017 11:11am

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

I almost did go for the taller fifth gear option, however was advised not to by Ashcrofts as I already had a disco transfer box. Even with a remapped ECU.

I did however opt for the updated bearings though

12th Feb 2017 11:12am

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

MJN110 wrote:
Are the tyres smaller than 235/85 R16?

Yes 235/70/16

12th Feb 2017 11:12am

Harry.O

Member Since: 25 Jul 2014
Location: Warwickshire
Posts: 716

I've recently fitted an Ashcroft box with a v8 5th gear ratio and am very pleased with the difference. In conjunction with 285/75 tyres it makes motorway speeds significantly quieter although that is in a TD5.

If you have an uprated I/C already then why not turn the boost and fuelling up a touch? That would help pull the gearing increase on motorway hills.

12th Feb 2017 1:17pm

MJN110

Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380

Yes i was planning on adjusting the pump and boost.

12th Feb 2017 8:57pm

MJN110

Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380

I was hoping that somebody with a 300tdi with the higher 5th gear option would have responded.
Maybe nobody has opted for it?

22nd Feb 2017 10:49am

miker

Member Since: 13 Sep 2015
Location: Surrey
Posts: 1763

I have a TD5 with the higher 5th and very happy with it.

A friend has a 300tdi with a 1.2 Tbox and is very happy with it, thought it is slower off the line.

Based on that, I'd say you'd have no issues with the v8 5th in a 300tdi!

22nd Feb 2017 11:32am

jeffersj

Member Since: 23 Jan 2015
Location: Near Preston
Posts: 431

1996 Defender 90 300 Tdi HT Bronze Green

I have a 300Tdi with R380 box with 5th gear, Td5 transfer box. Great on motorways but need to be over 35-40 before changing up otherwise it labours. A Slickshift makes gear changing much easier. Jeff
Ex 1968 Series 2A
Ex 90 TD5
Ex D3
Ex D4

22nd Feb 2017 5:54pm

MJN110

Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380

When you say you have a td5 transfer box are they not the same as a 300tdi? Or do you mean you have a 1.2 ratio transfer box like a disco combined with the higher 5th gear option from ashcroft?

22nd Feb 2017 9:35pm

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