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Thread: Series 2A drivetrain upgrade

  1. #11
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    Quote Originally Posted by JDNSW View Post
    Both, actually. The standard tyres are 6.00x16, or about 155mm width and 180mm height for a 0.85 height radial (or original may have been 6.50x16 making the radial figures about 165mm and 195mm)- these look wider than that in the picture. They also look higher. Increased height means the steering angle is limited because the tyre hits the chassis sooner, and increased width has the same effect, so you get a double whammy effect. The increased width effect can be mitigated by changing the offset, but the amount this can change is limited, and moving the centre of the tyre out can have an adverse effect on steering.

    OK Ill check them out

  2. #12
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    Quote Originally Posted by JDNSW View Post
    Both, actually. The standard tyres are 6.00x16, or about 155mm width and 180mm height for a 0.85 height radial (or original may have been 6.50x16 making the radial figures about 165mm and 195mm)- these look wider than that in the picture. They also look higher. Increased height means the steering angle is limited because the tyre hits the chassis sooner, and increased width has the same effect, so you get a double whammy effect. The increased width effect can be mitigated by changing the offset, but the amount this can change is limited, and moving the centre of the tyre out can have an adverse effect on steering.
    I had a look at them and thay are LT235/85R16 as stamped on sidewall, are those numberrs in mm?

  3. #13
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    Iv done a bit of searching, and someone has put an isuzu box in one with minor mods, but i have also heard that a late model V8 defender box will go is easy but the front diff will need to be modded so it isnt full time 4WD, i have diff lockers on the front of mine, that i always have locked but have the yellow 4WD knob thingy up in the cabin so it isnt 4WD so the front end is always turning, will i need the mod?

    Get the idea?
    wonder how well a 10 bolt will go in it...

  4. #14
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    Quote Originally Posted by Unleashed V12s View Post
    I had a look at them and thay are LT235/85R16 as stamped on sidewall, are those numberrs in mm?
    The 235 is the width in mm. This compares with the standard tyres of about 155mm width. i.e. about 80mm wider. Assuming the offset is the same as the standard rim, this would mean the inside front wheel has to stop turning 40mm further from the chassis. The height of the tyre is 235 x 0.85mm or about 200mm, about 50mm more than the standard tyre, adding about 25mm to the limit on turning. This is a reduction of nearly ten degrees in the maximum steering angle.
    John

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    1986 110 County 3.9 diesel
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  5. #15
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    Quote Originally Posted by Unleashed V12s View Post
    Iv done a bit of searching, and someone has put an isuzu box in one with minor mods, but i have also heard that a late model V8 defender box will go is easy but the front diff will need to be modded so it isnt full time 4WD, i have diff lockers on the front of mine, that i always have locked but have the yellow 4WD knob thingy up in the cabin so it isnt 4WD so the front end is always turning, will i need the mod?

    Get the idea?
    wonder how well a 10 bolt will go in it...
    The Series Landrover is part time four wheel drive (except Stage 1), and the Defender is full time four wheel drive. The issue is that the Series front axle does not have CV joints,but has cross and bearing universals. These will cause kickback in the steering twice for every revolution of each wheel when driven on hard surfaces with full time four wheel drive. To use the Defender gearbox and transfer case in a Series vehicle you need to fit CV joints to the front axle or convert the transfer case to part time four wheel drive.

    Converting the front axle is not really feasible but the axle from a Series 3 Stage 1 bolts in and it does have CV joints. But the diff ratio is different, although the diffs are interchangeable.

    Someone in the UK does a conversion kit for the transfer case. It is possible to fit other gearboxes and retain the Series transfer case, but it will involve a lot of work, including fabrication and machining - as far as I know there are no off the shelf conversions.

    Hope this helps

    John
    John

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    1986 110 County 3.9 diesel
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    Quote Originally Posted by JDNSW View Post
    The 235 is the width in mm. This compares with the standard tyres of about 155mm width. i.e. about 80mm wider. Assuming the offset is the same as the standard rim, this would mean the inside front wheel has to stop turning 40mm further from the chassis. The height of the tyre is 235 x 0.85mm or about 200mm, about 50mm more than the standard tyre, adding about 25mm to the limit on turning. This is a reduction of nearly ten degrees in the maximum steering angle.
    Hmm ok, I thought these were skinny, the origionala must be real cheese cutters :'D


    Quote Originally Posted by JDNSW View Post
    The Series Landrover is part time four wheel drive (except Stage 1), and the Defender is full time four wheel drive. The issue is that the Series front axle does not have CV joints,but has cross and bearing universals. These will cause kickback in the steering twice for every revolution of each wheel when driven on hard surfaces with full time four wheel drive. To use the Defender gearbox and transfer case in a Series vehicle you need to fit CV joints to the front axle or convert the transfer case to part time four wheel drive.

    Converting the front axle is not really feasible but the axle from a Series 3 Stage 1 bolts in and it does have CV joints. But the diff ratio is different, although the diffs are interchangeable.

    Someone in the UK does a conversion kit for the transfer case. It is possible to fit other gearboxes and retain the Series transfer case, but it will involve a lot of work, including fabrication and machining - as far as I know there are no off the shelf conversions.

    Hope this helps

    John
    Makes sense
    So the series and defender transfer case/ gearbox can't go together?!

    Thanks for the help

  7. #17
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    Simple way to significantly improve lousy steering lock on Series Land Rovers is to fit Wolf rims instead of the standard ones such as 5'5 inch wide x!6 272309's . Wolfs are steel rims fitted to more recent 130's and military Defenders. More important than the extra total width is that the offset is different and the inside of the rim is about an inch further away from the chassis compared with standard ones and also 7 inch wide Disco 1 steelies. I have fitted them to '61 LWB acquired from a deceased relative's estate. Screwed the steering stops right back. Limiting factor to turning circle is now limited by travel in steering box. Did small adjustment to rods so about equal amount of clearance between tyre and chassis on each side when on full lock. Seems about as far as it is desirable to go before likely to cause problem with swivel housing seals. Tyres fitted are 7'50X16 Michelin XZL's. Have not yet tried other Wolfs I have with 2.35/85 Goodrich Mud Terrains. These probably still would not rub chassis on full lock.

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    Quote Originally Posted by Unleashed V12s View Post
    Iv done a bit of searching, and someone has put an isuzu box in one with minor mods, but i have also heard that a late model V8 defender box will go is easy but the front diff will need to be modded so it isnt full time 4WD, i have diff lockers on the front of mine, that i always have locked but have the yellow 4WD knob thingy up in the cabin so it isnt 4WD so the front end is always turning, will i need the mod?

    Get the idea? Series 2A drivetrain upgrade
    wonder how well a 10 bolt will go in it...
    You don't have "diff lockers" - you have free - wheel hubs (huge difference! )
    I recall back in the mists of time, my brother telling me about a series with a small-block v8 and auto running Rover 90 or 110 diff centres. Reckoned 75mph down the beach was achievable, but scary as hell. Series 2A drivetrain upgrade
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  9. #19
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    Quote Originally Posted by Unleashed V12s View Post
    Hmm ok, I thought these were skinny, the origionala must be real cheese cutters :'D

    Depends what you compare them with! The original Landrover steering, suspension, and gearing were designed around 6" (150mm) tyres, copied direct from the WW2 Jeep. This was, in fact, pretty standard for larger cars at the time, but wider than woould have been ordinary for cars of similar size which would have had tyres a little narrower.

    7" (180mm) was introduced for the lwb Landrover in 1953, going to 7.50" (190mm) with the introduction of Series 2, and remaining at that for the rest of Series production, and, indeed for coil sprung Landrovers into the mid 1990s. The One Ton Series Landrover (none believed to exist in Australia) came with 9" (230mm) tyres, but it also came with a revised and lower geared steering box to avoid the heavy steering resulting from the wider tyres. Lots of people have fitted wider tyres to Series Landrovers, but for most users they make little sense, and involve compromises such as the turning circle discussed here, steering load, worse ride due to increased unsprung weight, weight and size of spare, etc. The best argument for larger tyres (and this applies only to height, not width) is that they give increased ground clearance, better performance in sand, and effectively higher gearing - which is the opposite to what you want!

    As for "cheese cutters" - tyres on most cars (e.g. Ford) up to the late twenties were only 3.5" (90mm), and even up to WW2 were rarely as wide as 6" (150mm) except on very large cars.




    Makes sense
    So the series and defender transfer case/ gearbox can't go together?!

    Thanks for the help
    I would not say "can't" - just that it is not easy, simple, cheap or routine!
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  10. #20
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    Quote Originally Posted by mox View Post
    Simple way to significantly improve lousy steering lock on Series Land Rovers is to fit Wolf rims instead of the standard ones such as 5'5 inch wide x!6 272309's . Wolfs are steel rims fitted to more recent 130's and military Defenders. More important than the extra total width is that the offset is different and the inside of the rim is about an inch further away from the chassis compared with standard ones and also 7 inch wide Disco 1 steelies. I have fitted them to '61 LWB acquired from a deceased relative's estate. Screwed the steering stops right back. Limiting factor to turning circle is now limited by travel in steering box. Did small adjustment to rods so about equal amount of clearance between tyre and chassis on each side when on full lock. Seems about as far as it is desirable to go before likely to cause problem with swivel housing seals. Tyres fitted are 7'50X16 Michelin XZL's. Have not yet tried other Wolfs I have with 2.35/85 Goodrich Mud Terrains. These probably still would not rub chassis on full lock.
    Now that you mention military rims, I am currently running a set of my dad's rims offf a 6x6 army (I think) landrover, they are heavy (armoured) but I think they have that 1" offset

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