 | Home > Technical > Td5 gearbox ratios |
 
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| TR51 Member Since: 17 Apr 2012 Location: Dorset UK Posts: 333   
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I believe 1.410 are usually standard on all Defenders, but can be replaced by the 1.222 gear ratios as came fitted to Disco's.
I had a similar issue (in that my TD5 felt limited to 60-65), and it turned out to be a stuck wastgate. I didnt notice any difference in the low gears, but on the dual carrigeway/any hills it was definately down on power. Easy to check and usually to rectify (with a lot of patience and WD40  ).
Thanks to IRBdevelopments for the video |
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22nd Jun 2013 4:32pm |
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| JimboD3 Member Since: 09 Apr 2013 Location: Ware, Herts Posts: 55  
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Checked the wastegate a couple of weeks ago after seeing that thread !
It really feels like a gear ratio 'issue', almost like a 6th gear is needed......which is why I'm wondering what the 'gearbox ratio group No.2' on the build sheet refers to. Td5 110 HD Hardtop.......not quite standard  |
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22nd Jun 2013 5:05pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5815 
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Some were fitted with 1.6 trans boxes, so have no top end speed at all. Do you have a rev counter? Could mop are revs per speed
Andy |
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22nd Jun 2013 5:40pm |
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| JimboD3 Member Since: 09 Apr 2013 Location: Ware, Herts Posts: 55
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No rev counter, but I do have a Mk1 Nanocom (which I think shows the RPM ?)
Oh, and the transfer box is stamped 1.411 Td5 110 HD Hardtop.......not quite standard |
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22nd Jun 2013 5:43pm |
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| Sphere Member Since: 26 Apr 2013 Location: Midlands Posts: 725 
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1.4 is a standard ratio. I don't think the gearbox ever changed on the td5 ratios. I hav just changed mine to a 1.2 from a disco and can now cruise at 70 however lost some of the pulling capacity. I would recommend this mod especially if your not towing heavy
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22nd Jun 2013 7:03pm |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6141 
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The things that seem strange about your build sheet, are:
All Td5's have a 120amp alternator as standard and they have 1.4:1 t/box (defenders, that is) and I didn't think there was a HD clutch for Td5... certainly not shown in microCAT Uprated transmission could well be 4pin front diff to suit the "HD axles" (which also had vented discs, but I think most 110's had that anyway on the front) |
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22nd Jun 2013 8:13pm |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443  
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I must admit to taking the original build specs with a pinch of salt, there is a web page that you can source your original build specs if you put in your VIN number, I can't remember where but I put mine in and it told me that mine has air con, not a chance. It is not supposed to have abs or traction control but it does, the one thing it does get right is the colour so all that I got from my looking at it was the build date which was about three months before its registration date which are on the V5 anyway
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22nd Jun 2013 9:13pm |
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| adseybear Member Since: 08 Oct 2009 Location: Vancouver, Canada Posts: 262 
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Floor it in a lower gear and see what you get, you should be able to do 55ish before hitting the limiter in 3rd with standard gearing. 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 |
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2nd Jul 2013 5:46pm |
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