Best tranny for a 300tdi? - Defender Source
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  #1  
Old September 27th, 2011, 10:11 AM
bjlover
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Andy
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Best tranny for a 300tdi?

What is the best combo to go with a 300tdi? Would it matter on 90 or 110? I am obviously talking 5speed here not auto... Thanks
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  #2  
Old September 27th, 2011, 10:24 AM
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Bill Adams
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suffix j R380
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  #3  
Old September 27th, 2011, 12:04 PM
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suffix L r380

http://www.ashcroft-transmissions.co...od&productId=6

"
This suffix J did unfortunately have a couple of design flaws which gave the R 380 some bad press, they were prone to the mainshaft shearing across the oil feed holes, the layshaft also sheared at a stress concentration behind the sandwich plate causing loss of 5th and reverse also early ones still suffered from mainshaft wear until the cross drilled transfer case gears became fitted as standard on the suffix G transfer cases.
In 1999 the suffix K was used very briefly for a few months then came the suffix L. The K and L are virtually identical, the only difference I have found is the L outer main casing has an additional strengthening rib, internals are the same. The J and K/L are very different, 2 of the bearings were substantially uprated and pinion and layshaft teeth were widened again, this results in a much stronger unit.


"
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  #4  
Old September 27th, 2011, 12:33 PM
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Interesting handle there Anthony...
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  #5  
Old September 27th, 2011, 12:43 PM
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You can make the LT77 fit the 300 if needed, handy if a) your existing 'box is good/new/shifts well, or b) you've got the 56A suffix LT77 military box, with the lowered 1st & 2nd gears

But overall, as said up there ^^^^ late R380 (or even a Td5 spec R380 with the bellhousing and input shaft swapped over)
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  #6  
Old September 27th, 2011, 01:12 PM
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mark kellgren
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Quote:
Originally Posted by SMac View Post
Interesting handle there Anthony...
X2. I think Neil has an East Coast twin brother.
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  #7  
Old September 27th, 2011, 01:15 PM
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I have a suffix L from Ashcrofts-think thats about as good as it gets.
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  #8  
Old September 27th, 2011, 01:21 PM
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barry f
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I think this tranny will work well with your application. Just grab the stick and shift.
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  #9  
Old September 27th, 2011, 01:26 PM
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Are the gear ratio's different between the TDI and V8 boxes?
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  #10  
Old September 27th, 2011, 02:20 PM
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@Smac... I used to have a Toyota Land Cruiser BJ40... I was trying for something that I would not forget b/c I am constantly forgeting login's and passwords. I think that I am going to change it. Is there anyway I can change my name but keep my thread history, etc.?
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  #11  
Old September 27th, 2011, 02:32 PM
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This is it

http://www.ebay.co.uk/itm/6-SPEED-GE...#ht_500wt_1046
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  #12  
Old September 27th, 2011, 02:40 PM
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Ashcrofts were also talking about making an adaptor for the 6 speed to Td5 engine... that's something i'd be intersted in! very much!
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Old September 27th, 2011, 02:46 PM
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this is it

Ya me to, I had the latest greatest r380 specially built for my 2.8 last fall. even checked with all the usual suspects about this precise set up... and a month later after the install... what do you know here it is!

-Gustaf

ps Let me know if you pull the trigger, interested to see how it turns out.
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  #14  
Old September 28th, 2011, 12:44 AM
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Andy
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Pardon me being a newbie but is there anything different about the R380 transmissions you guys are talking about and the standard R380? Is the disco one different than the defender model? Also is there anything that should be noted that should be used to mate the 300tdi and the r380? I am basically sourcing a donor truck and know that I want to go 300tdi but want to make sure that I get the right tranny, etc...

Thanks!
Anthony
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  #15  
Old September 28th, 2011, 03:02 AM
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The "latest" R380 just has slightly different (improved) internals.... different synchros, different bearings etc, as technology moves on, LR eventually catch up and change their stuff. plus the Td5 engine is more powerful than the older Tdi, so it makes sense that they have to make the gearboxes suitable to tolerate the extra ooomph.

The disco and defender box are the same internally, although the V8 vs Tdi/Td5 have slightly different ratios, not enough, i don't think, that you'd notice it much.

There is a major external difference between disco and defender boxes though... the shifters are in a different position.

on defenders, the main 1-5 & reverse is towards the front of the vehicle, with the smaller transfer lever towards the back.

on discos, it's the other way round, transfer is towards the front, main stick towards the back.

To swap them over you need a box strip down (apparently, never done it myself) to swap internal slector forks around.

However, i know a few people who have fitted the disco box into a defender, and had the gearstick coming up (more or less) through the middle of the seatbox, where the cubby box would be, towards the front edge, and it's a very comfy driving position.
so horses for courses, take your choice. keep it "factory" or modify the internal bodywork a little.
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Old September 28th, 2011, 08:10 AM
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Did it have the diesel or gas B engine? Sweet truck. One of the few Japanese rigs that I have an eye for. As far as changing your handle, you'd have to refer to the admins; I haven't a clue. Thanks for bringing up this topic...I'm a year or so out from a 300tdi I hope.

Quote:
Originally Posted by bjlover View Post
@Smac... I used to have a Toyota Land Cruiser BJ40... I was trying for something that I would not forget b/c I am constantly forgeting login's and passwords. I think that I am going to change it. Is there anyway I can change my name but keep my thread history, etc.?
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  #17  
Old September 28th, 2011, 08:54 AM
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Quote:
Originally Posted by jamespierce View Post
Are the gear ratio's different between the TDI and V8 boxes?
yep-input shaft is totally different but a swap can be done with the right parts.
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