 | Home > Technical > Diff Ratio's |
 
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3616   
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if that is just 1 wheel rotating as the other is still on the ground then double it i.e. 2 and a bit X 2 = (4 and 2 bits / 1). Need to be more accurate with the "bit" to get an accurate figure. Also you are much better to have the same ratios front and rear or the transfer box diff is working all the time and diff lock will result in rapid wind up, expect you already know this but just in case. DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
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16th Oct 2014 6:13am |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6041 
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All 90/110s have the same ratio (3.54:1), unless of course, someone had changed the ratio in your new axle.
However I think that after a tank full of fuel, by now your center diff would have siezed up. Was the old drum brake axle mis-adjusted and the brakes binding? |
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16th Oct 2014 7:49am |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558 
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if you have got a different diff back to front it will cause trouble soon
one way to tell would be park up on tarmac on a long straight bit of road ( car park at night etc ) don't drive it with centre diff locked until you are certain all is ok lock centre diff AND PUSH defender BY HAND get your boy to help if you can push it a desent distance without the transmission to winding up ( if its winding its self up it will become harder and harder to push and feel like your trying to push a big spring , if you can push it ok you should have the same diffs , must be pushed in a straight line as any turning bends will cause wind up anyway not sure if diffs are marked on outside only 100% way is to remove and count the teeth or numbers on the diff |
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16th Oct 2014 8:54am |
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| cornish rattler Member Since: 31 Aug 2013 Location: Manchester Posts: 642 
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LR90 and diesel jim yeah the axle is my old axle i have just recently taken off, the axle is on the garage floor on a jack and block of wood and pretty certain both brake drums were turning but only consentrated on one drum driver's side one so with 1 full rotation of the drum the diff drive flange turned 2.1/4 turns
it is just my 90 2.5td ( 200tdi ) is very heavy on juice giving 20 mpg and as far as i can tell everything is right the engine has good performance not smokey or any funny noises, serviced, brakes ( drums ) wasn't binding, H/B off and not binding, nothing bolted to the landy , no roof rack but do have 265 special tracks fitted and a tweaked pump but everyone is saying that i should still be getting over 20 mpg. so just trying to work out if someone has fitted series diffs to my landy when it was still a 2.5td for some reason  Graham
1988 Defender 90 county 200tdi ( Beast ) Paul Walker 1973-2013 ( I Almost Had You ) Last edited by cornish rattler on 16th Oct 2014 11:00am. Edited 1 time in total |
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16th Oct 2014 10:34am |
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| cornish rattler Member Since: 31 Aug 2013 Location: Manchester Posts: 642
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I will give that a try as soon as i can  Graham
1988 Defender 90 county 200tdi ( Beast ) Paul Walker 1973-2013 ( I Almost Had You ) |
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16th Oct 2014 10:36am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16920 
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Alternatively lock the centre diff, chock the wheels on one side of the vehicle, and jack both wheels on the unchocked side off the ground.
Then turn one raised wheel and see if the other rotates at the same rate (or turn one say ten full revolutions and check the other has turned exactly ten full revolutions). (Editted for spelling). |
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16th Oct 2014 11:42am |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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or find somewhere quiet with a gentle slope and let it roll slowly as before with diff locked etc ,just don't drive it - push or roll gently only |
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16th Oct 2014 12:02pm |
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| cornish rattler Member Since: 31 Aug 2013 Location: Manchester Posts: 642
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That's an idea my drive is on a slight slope i will give it ago tomorrow if the weather is ok
Graham
1988 Defender 90 county 200tdi ( Beast ) Paul Walker 1973-2013 ( I Almost Had You ) |
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17th Oct 2014 12:51am |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3616
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that is a good idea, a bit of masking tape at the top of each raised wheel before you start would make it obvious pretty quickly if different ratios were fitted. However to work the ratios out do the same and then turn the prop shaft watching the tape and counting the number of prop revolutions, do this so that one of the wheel rotates twice and the tape is back at the top, this is your ratio. If both wheels have bits of tape that are back at the top the ratios are the same. (if you do this for say 10 wheel revolutions as suggested by blackwolf and divide the prop turns by 5 it will be more accurate and highlight any small difference in ratio) If the second wheel has tape at a different point other than the top it has a different ratio to the first wheel you did, repeat the process for this wheel to determine the ratio and then you will know the ratio of each axle, allowing you to decide which one to replace and the ratio you need to replace it with. (good luck) DEFENDER 90 TDCI XS, I hope everyone is well and your land rovers make you happy |
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17th Oct 2014 6:38am |
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| cornish rattler Member Since: 31 Aug 2013 Location: Manchester Posts: 642
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I havn't got round to doing this yet but as i am off this week i want to spend a day on the landy tomorrow weather permitting ( sons car is in the garage and is too awkward to get out ) so will have ago then once i have sorted out a snapped exhaust bracket and grease upafter off roading at the weekend
Graham
1988 Defender 90 county 200tdi ( Beast ) Paul Walker 1973-2013 ( I Almost Had You ) |
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21st Oct 2014 2:55pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7706 
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its highly unlikely the diff ratios between your old and new axle are different.
both diffs you describe are 3.54s if one was different you would issues by now as it would be different to the front diff. Cheers James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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21st Oct 2014 7:36pm |
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| cornish rattler Member Since: 31 Aug 2013 Location: Manchester Posts: 642
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Are right ok Graham
1988 Defender 90 county 200tdi ( Beast ) Paul Walker 1973-2013 ( I Almost Had You ) |
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21st Oct 2014 7:56pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7706
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? totally lost by last post. Cheers
James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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21st Oct 2014 8:13pm |
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