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grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4796

Td5 transmission

Well after about 111,000 miles the gearbox has given up on my td5 defender - the last 45,000 of which it has been fairly heavily tuned. I'm having the gearbox rebuilt with a discovery v8 5th gear (5% taller gearing) having puma spec quiet gears in the transfer box and an ashcroft atb centre diff.

Does anybody have experience of this kind of spec setup? I'm looking forward to the taller 5th as I do a lot of higher speed driving but I'm not sure what to expect from the centre atb? 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
Instagram http://www.instagram.com/george_grafton

17th Dec 2015 6:28pm

adseybear

Member Since: 08 Oct 2009
Location: Vancouver, Canada
Posts: 262

I'm curious, who is doing the transmission work?

I can't see me getting more than a couple of years out of my gbox/tbox. 2003 Defender 90 Td5 CSW Belize Green - "Betty"
1958 Series IIA 109 Station Wagon - "Randolph" - Awaiting Restoration
2019 Jeep Wrangler JL Rubicon - SOLD
2006 Volvo V70 D5 - Ocean Race Edition, SOLD
2003 VW Passat Estate 1.9TDI - SOLD
2008 BMW 320D M Sport Estate - SOLD
2001 Defender 90 Td5 Hard Top - SOLD

18th Dec 2015 10:31am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4796

I've taken it up to IRB developments - Ian is the only person I'd trust to work on my defender other than me.

I'd do it myself but the workshop at home is full of immobile range rover classic at the moment.

I think gearbox life is linked to driving style. Although I drive fairly quickly I am always mechanically sympathetic and try to be as smooth as possible.

My original gearbox lasted 111,000 miles and my dad's 110 csw 300tdi has near enough 100,000 miles on the original gearbox

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
Instagram http://www.instagram.com/george_grafton

18th Dec 2015 11:06am

epictrail

Member Since: 20 Sep 2013
Location: High Wycombe
Posts: 395

When i asked Ashcroft about the V8 gearbox gear (5% taller) they said as I had the disco longer final drive in the transfer box they didn't think it was worth the additional cost as 5% is such a small change for the extra £110

http://www.ashcroft-transmissions.co.uk/in...roductId=6

18th Dec 2015 11:34am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4796

I haven't spoken to ashcroft myself - it's where I saw the option for the taller gearing though.

Being as I'm hoping to get another 100,000 miles from the rebuild I don't mind the £110 cost as I'm sure it will make a slight difference to economy. Even if it doesn't it should be quieter on the autobahn

18th Dec 2015 3:13pm

miker

Member Since: 13 Sep 2015
Location: Surrey
Posts: 1772

Had an ashcroft built R380 fitted to my TD5 on thursday. Only done about 50 miles on it since, but first impressions are quieter on the motorway, now sits at 80 and most of the noise is wind. Previously it would be gearbox scream at 70! Needs a remap to pull the higher 5th comfortably though I'd say, Although I think I might be a little down on power at the minute. And I'm still used to a fast diesel hatchback!

What are these quiet puma transfer case gears you speak of?

19th Dec 2015 1:12am

barbel jim

Member Since: 12 Dec 2012
Location: Northants
Posts: 1434

grafty99 wrote:
Although I drive fairly quickly:

19th Dec 2015 8:45am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4796

Quote:

Although I drive fairly quickly:

Quote:

What are these quiet puma transfer case gears you speak of?

Yes - disco 2's and pumas have "q cut" gears that make less whine at speed. The trade off apparently is that they aren't as strong. That is as far as my knowledge stretches I'm afraid

19th Dec 2015 4:02pm

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