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william8

Member Since: 03 Apr 2013
Location: Motherwell
Posts: 259

2008 Defender 90 Puma 2.4 XS CSW Zambezi Silver

Transfer box ratio change in a puma

I'm aware this is done regularly for the TD5's and TD's but in the puma i fell as though 1st is useless and it revs awfully high on the motorway. So why not make use of 1st and raise the gearing on the gearbox overall to increase fuel economy while on the motorway. Most of our engines are tuned so can handle the higher load and i think it would generally be a better ride.

So to that end, has anyone ever fitted this ,
http://www.ashcroft-transmissions.co.uk/lt...r-set.html

The standard ratio on a defender tdci is 1.22 but this is 1.003. Ill do the maths later but for £200 its worth it if it saves fuel on the motorway.

Any input appreciated

William

6th Mar 2014 9:01am

Co1

Member Since: 19 Aug 2018
Location: North Yorkshire
Posts: 3681

Hell of a thread resurrection, but has anyone actually done this?

17th May 2021 5:25pm

ickle

Member Since: 22 Jul 2010
Location: South Vendee
Posts: 1786

2008 Defender 110 Puma 2.4 CSW Alpine White

No - but I found running higher profile 285's did the trick nicely, 1st better, still tows well, more relaxed at speed etc.

Not sure how the increase in gearing relates to the ratio change but for me its 100% spot on.

HTH Keith

18th May 2021 3:41pm

MatLandy

Member Since: 11 Sep 2020
Location: Paris
Posts: 184

2008 Defender 110 Puma 2.4 CSW Zermatt Silver

I have the 1.1 ratio in my 2.4 Puma. This is roughly corresponding to a 10% decrease of engine rpm for the same vehicle speed. It just feels right on my tuned 2.4 Puma, for my usage. Pulling nice and strong.
https://www.defender2.net/forum/topic75116.html

Wondering if the 1.003 ratio that you are looking at may be pushing it a bit and possibly resulting in a sluggish truck when in 6th gear?
Alternatively you may just change the tyres size (diameter) to the same effect, except also affecting low range.

/Mat

Last edited by MatLandy on 19th May 2021 7:15am. Edited 1 time in total

18th May 2021 3:51pm

ashtrans
Site Sponsor

Member Since: 08 Nov 2008
Location: Harpenden
Posts: 258

Hi,

vehicles are different, engine tunes are different and driver perception is different, we have had a couple of customers do this but I suspect in most instances the 1.003 would be too high, Dave

19th May 2021 7:13am

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