bluesj
Member Since: 26 Dec 2023
Location: East Sussex
Posts: 9
  
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Can one of you fine fellows tell me what if anything is different between the controller part no NNW51207 and 7H42 - 7H417- AC. Is it just the 7H42 supersedes the NNW.
More importantly should the NNW51207 work in my 08 D3 that has a kaput 7H42 fitted .
Many Thanks
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 28th Jul 2024 7:10 am |
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bluesj
Member Since: 26 Dec 2023
Location: East Sussex
Posts: 9
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Thanks very much, very useful site!
Don't know what the 7H42 number is all about because I found a TCCM with that number on it in a land rover box maked with the NNW512070 number.
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| 28th Jul 2024 8:35 am |
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kajtzu
Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6766
 
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I think you mean NNW512070 (you were missing the last digit). This is a regular Land Rover part number for us mortals. 
The other one should really be grouped into three character groups:
[four characters]-[five characters]-[two characters]
First group: The first character indicates the model year, 7 means MY07 (5 = MY05, etc.), the three following characters indicate department (and something else, IDK)
Second group: this is the engineering callout number which can be seen on some drawings
Third group: version or revision (AA, AB, AC, BC, etc.)
The NNW part can be found here https://parts.jaguarlandroverclassic.com/n...ntrol.html, note the text “This is part 7E453 on the illustration.”, this is the callout you can see on the image above. On the other hand there isn’t a mention of the part having been superseded which tends to show up if it had been.
I don’t have access to microcat or similar that (I guess) would allow to lookup parts based on callout and then compare it to other parts. For example, I can’t explain why you have another callout for the same part. Perhaps it is for a different model or type of vehicle.
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| 28th Jul 2024 9:12 am |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10732
 
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if you goto the link in the above post.
scroll down the page to the bottom and click disco3
click transfer case
click transfer case again
click some + on the right, next to module
NNW512070 is a later part, suitable for cars upto VIN6A999999
and as you go down and click more ++
is also suitablefor VIN8A469275 FROM VIN7A000001
and infact all VINs  
It was only factory fitted from VIN8A469276
So yes, it should work. It may however need calibration and or programming.
I think you need to drive forwards and backwards at a lowish speed to calibrate it or something.
Search for transfer box calibration on here
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| 28th Jul 2024 9:50 am |
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kajtzu
Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6766
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Yeah one has to be quite the part archeologist to figure these out sometimes……
I think backwards compatibility is for JLR’s benefit, they do not need to keep a million variants around but can fit the newest part to the oldest vehicle for quite some time.
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| 28th Jul 2024 10:03 am |
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