Lt77 to R380 Stumpy - Defender Source
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  #1  
Old February 20th, 2014, 10:54 AM
edh
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Ed
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Lt77 to R380 Stumpy

Ok so I should have listened and swapped out the lt77 in my ex-mod 90 last year when my throw out bearing went, it was occassionally jumping out of reverse. Now it won't stay engaged for almost any duration.

So I am thinking that the easiest fix would be to use a R380 stumpy, but I am not sure what is needed besides the transmission. I am assuming that I could reuse the xmember and tunnel, what else is compatable? It is my DD so I would like to have everything set for a weekend swap. Not this weekend of course but some weekend when I am allowed to crawl around in my driveway under " that piece of shit that was already finished"

Ed
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  #2  
Old February 20th, 2014, 11:15 AM
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John B.
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The "kit" from ashcroft comes with everything you need: http://www.ashcroft-transmissions.co...sing-r380.html

You probably want a new shift knob... Call Ashcroft direct and they can answer any of your questions.
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Old February 20th, 2014, 11:48 AM
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In truth, a shop did all of the work for me. Big things you need aside from the transmission, though, are:

- the right shift knob (the pattern changes)
- a new gasket kit (might as well since you are in there)
- I went ahead and got a clutch kit (again, since I was in there)
- I also went ahead and resurfaced the flywheel (ditto again)
- the right transmission fluid (apparently this was difficult to turn up?)

Nothing had to change on the transmission tunnel, crossmembers, or anything else. From what I understand, it is pretty much a drop-and-replace procedure, but it took the shop a bit of time to complete (in fairness, they were a Volvo shop, not a Rover one, but Knoxville does not have any of the latter).

All that said, I do have a shorty R380 for sale...
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  #4  
Old February 20th, 2014, 12:03 PM
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John B.
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There should not be any gaskets used when changing a gearbox.

In addition to a new clutch, I would also change the clutch slave and flexible hose. There are various options for clutches.

Use Redline MTL for the fluid and that is what you should be using in the LT77 as well.
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  #5  
Old February 20th, 2014, 12:40 PM
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*shrug* Gasket, seal, whatever the appropriate term is for the not-metal material that makes two metal surfaces seal together nicely.

Specifically, the shop I used put in MTL 75W80 GL-4, but apparently just had a hard time procuring it.
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Old February 20th, 2014, 12:58 PM
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One thing to look for is the transfer case linkage. Land Rover changed the designed and you may need to buy new linkage depending on your transfer case age. The old design has the linkage held by a bracket mounted flat to the LT77 with a "U" shaped link at the transfer case, while the new design has the linkage held off the transmission with a bolt (going from memory) and a twisted "S" shaped link at the transfer case.

I think I have a parts diagram buried somewhere if you need it.
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  #7  
Old February 20th, 2014, 01:35 PM
edh
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Thanks, just did the clutch and had the flywheel resurfaced when I replaced the throw out bearing. Also did the slave and lines, have the master sitting in a box somewhere. I will check into the t/case linkage mounting. Jonathan we may be able to strike a deal, will you take a kidney, or a liver or anything else in trade?

Ed
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Old February 21st, 2014, 10:57 AM
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PM sent .
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Old February 21st, 2014, 12:36 PM
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So question, if a guy changes from an LT77 to a stumpy, is there a change in the transmission cover? Since the stumpy mounts in the same place, would the lt77 cover still work or is an R380 cover needed?
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Old February 21st, 2014, 12:39 PM
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The LT77 cover works. It was designed by Land Rover to be a direct fit replacement.
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  #11  
Old February 21st, 2014, 12:44 PM
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As a bit of a fill in on information. Land Rover built the stumpy R380s when the LT77 went out of production to be a retrofit option. The UK army used a lot of them as they continued buying trucks with NA engines.
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  #12  
Old February 21st, 2014, 12:53 PM
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Quote:
Originally Posted by Red90 View Post
The LT77 cover works. It was designed by Land Rover to be a direct fit replacement.
Thanks, John
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