R380 and 300TDI Compatibility - Defender Source
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  #1  
Old February 25th, 2009, 03:53 PM
Paul Grant
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R380 and 300TDI Compatibility

Can someone tell me whether or not an NAS R380 will fit a 300TDI? Naturally, the TDI bellhousing is available. Am I correct in assuming that will bolt up to the NAS R380?
TIA,
Paul
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  #2  
Old February 25th, 2009, 04:17 PM
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No, the input shafts for the V8 and diesels are different. Plus the gearing is wrong.
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Old February 25th, 2009, 04:18 PM
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Nope.
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Old February 25th, 2009, 04:57 PM
Paul Grant
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In between posting I learned that the shafts were different but neither Eric from AB or Arthur from RN mentioned the gearing. If the gearing is wrong that takes this box out of consideration. I thoughtsince the box was getting rebuilt that changing the input shaft might still keep this as a relatively inexpensive conversion.
Thanks for the responses,
Paul
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Old February 25th, 2009, 05:00 PM
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Gearing is not that different.

I have a 300Tdi R380.

Ron
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Old February 25th, 2009, 05:08 PM
Paul Grant
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so what is you feeling about using the correct input shaft during the rebuild? Worthwhile or not?
Thanks,
Paul
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Old February 25th, 2009, 05:16 PM
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1st and 5th are different.

http://members.shaw.ca/red90/gears.html#r380
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  #8  
Old February 25th, 2009, 07:16 PM
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Quote:
Originally Posted by Paul Grant
so what is you feeling about using the correct input shaft during the rebuild? Worthwhile or not?
Thanks,
Paul
You really should, and really can. The shaft will engage the clutch disc, but not fully and the pilot bush is different so it will work for a while before flying apart. Seen this first hand in an install by one of "those other shops".


The gearing will work fine.......give it some extra fuel and surprise your friends with the holeshot
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Old February 26th, 2009, 01:48 PM
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Paul,
the Defender V8 R380 and both Discovery and Defender 300Tdi R380 are geared the same. 1st and 5th are different on Discovery V8 R380s. If you put a 300 Tdi input shaft into your Defender V8 R380, you will have converted it. It is the only change necessary. I would not recommend running the V8 input shaft behind a 300Tdi. The input shaft is about 0.25" shorter and the pilot size on the V8 is 0.750" while the pilot on the Tdi shaft is 0.875". It would physically bolt up, but the input shaft would be unsupported in the back of the crankshaft and the clutch splines would also not be fully supported. It will not live long this way. If you're converting to a 300Tdi, it is money well spent to convert the transmission, too.
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