R380 Vs LT77 - Real World Differences? - Defender Source
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  #1  
Old May 14th, 2008, 03:03 PM
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Dave C
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R380 Vs LT77 - Real World Differences?

I understand the R380 was an 'updated' LT77, but what exactly is the difference? Is it a significantly stronger trans (from experience, rather than quated torque figures), or are the improvements more noise/NVH and shift-comfort (synchro) related?

Next - What is needed to convert a discovery LT77/R380 to work in a Defender? Is it new housings / selectors, or a dis-assembly and rebuild of the selectors with the old housing?

How does parts availability between the two trans compare?
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  #2  
Old May 14th, 2008, 03:23 PM
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Jim Cheney
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As it was explained to me, I believe the composition/design of the synchros is different at the very least, but I'm far from the best person to comment.
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  #3  
Old May 14th, 2008, 03:51 PM
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I believe the LT77 is slightly stronger, however, it does not shift as fast or smoothly as the R380, which I think was the big complaint about it from the NA market.

Having two Defenders currently, one with the R380, and the other with an LT77, I prefer the LT77 hands down, especially for off-road driving. It is nice to have Reverse right there with 1st and 2nd gear, where a quick shift can be made as opposed to the R380 where it is at the far opposite end of the shift pattern.
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  #4  
Old May 14th, 2008, 04:26 PM
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LT77 is made up of three pieces the R380 is one piece. Don't think there is a difference between one for a disco and a 90.
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  #5  
Old September 6th, 2011, 05:31 PM
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yes, hi. i'm the thread resurrector. =D

anywho - shifting "comfort" and construction... is that really about it to differentiate these two?
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  #6  
Old September 6th, 2011, 06:37 PM
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This is what I Know:

LT 77 stands for Leyland Transmission and was designed for 4 cyl gas and diesel motors

R380 stands for Rover Transmission and was the update designed to handle the high torque for a V8


they are both two piece. gearbox and T-case

The large one piece unit someone mentioned was a LT 95 gearbox and T-case in one big case.

The LT 77 does not deal well with a V8 motor. They tend to strip out the 2-3 syncro and gears. This was the reason Land Rover replaces them under warranty in the all 1994 NAS D90.

LT 77 is great with a 2.25, 2.5 gas or the 2.5NA 200tdi or even 300 Tdi

If you have a V8 you should really upgrade.

As for the snd question. If I remember correctly it's a different bell housing and different shifter. The output shaft is different from a V8 to diesel. (V8 is longer) so you need a to swap same to same to make it work w/o a big headache.

Good luck
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  #7  
Old September 6th, 2011, 07:37 PM
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Strengthwise the later LT77 (suffix G and H) seems to be close to the same strength. The synchros are not as good, but personally I don't find much difference. You need to be careful with reviews as the earlier suffix LT77 boxes are weaker and don't shift as well. The later R380 suffixes do have improvements, but you need to make sure you have the later version.

IMO....the LT77 synchro problems are due to people that do not know how to feel a shift or using the wrong fluid...... I personallt had an LT77 (behind a V8) with 300000 km and the shifting was the same as new.
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  #8  
Old September 6th, 2011, 09:50 PM
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The "G" and "H" have all the gear teeth 20% larger to increase strength for 200TDI, and V8 more powerful motors. The oil pump capacity was also increased to better handle heat issues associated with the more powerful motors. I am installing an LT77 "G" box behind my ACR2.8 now, and do not anticipate any trouble, or a need to upgrade to an R380.
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  #9  
Old September 7th, 2011, 12:23 AM
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Peter Stolz
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So one of the POs of my D90 (w/ an R380) must have had poor shifting form, because it is crunchy going into 2nd and 3rd gears. We've nursed it for about 20,000 miles like that, but now it's time to fix it. From what I've been hearing from repair guys is that replacing it with a rebuilt might be the way to go rather than rebuilding it or with another used one. Anybody have a good source for a rebuilt R380? I'm probably going to do the tfer case right away too because of a lot of slop in the driveline.
Thanks,
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  #10  
Old September 7th, 2011, 07:39 AM
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They seem to be stupid expensive, probably cheaper to cobble an auto swap together. Maybe they are getting cheaper since so many ROW trucks are coming ashore.. I would like to know also, its the only thing I dont have a spare of.
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  #11  
Old September 7th, 2011, 07:48 AM
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http://www.ashcroft-transmissions.co...iewCat&catId=4

ask for Dave
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  #12  
Old September 7th, 2011, 07:54 AM
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Speaking of Dave, he considers the L suffix R380 to be the strongest gearbox of them all, including the LT85. Or at least he says so on his website.
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  #13  
Old September 7th, 2011, 08:34 AM
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Pete,

Rebuilding an R380 is pretty straight froward and the cheapest option. I was a bit nervous until I did it. RN will have the parts. The trick is to stand it in a 5 gal bucket while dissembling it. Placing all the parts in order neatly in a tray/box on a work bench. It only fit back together one way. Sounds like you have a bad syncro for 2nd and 3 rd gear which is pretty common. If you double clutch I bet it doesn't grind.

If you want new, Doug is correct http://www.ashcroft-transmissions.co.uk/ is the way to go.

You may also want to check out George at RDS.


Good luck
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Old September 7th, 2011, 08:40 AM
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I bought a new one from Dave and including air freight and core charge it cost less than $1600 shipped to an airport 20 mins away where I picked it up from dhl.
Just saying.... its not hard doing business with the Uk.
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Old September 7th, 2011, 09:16 AM
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I order from the uk occasionally its sometimes cheaper and faster than ordering from some vendors here. I have never been a fan of rebuilt transmissions
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  #16  
Old September 7th, 2011, 11:06 AM
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this is what we have been working on for the last 2 weeks,

putting the 6 speed MT82 into the TD5 Defender :





Dave
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  #17  
Old September 7th, 2011, 11:08 AM
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Send it to Rob at Southwest Rovers. You wont be disappointed. I shipped it Fedex ground and it was 100 bucks each way. I had it back in a week. It was MUCH cheaper than just buying a rebuild.
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Old September 7th, 2011, 05:20 PM
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...best thread resurrect ever.
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  #19  
Old September 7th, 2011, 07:01 PM
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Quote:
Originally Posted by peachyracer View Post
So one of the POs of my D90 (w/ an R380) must have had poor shifting form, because it is crunchy going into 2nd and 3rd gears. We've nursed it for about 20,000 miles like that, but now it's time to fix it. From what I've been hearing from repair guys is that replacing it with a rebuilt might be the way to go rather than rebuilding it or with another used one. Anybody have a good source for a rebuilt R380? I'm probably going to do the tfer case right away too because of a lot of slop in the driveline.
Thanks,
Pete
www.lucky8llc.com ask Justin, I've just found out this weekend, he sells them and the price it is ridiculously good compared to AB , RN and the likes
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  #20  
Old September 7th, 2011, 07:04 PM
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I have a '94 d-90 how do i tell which transmission I have in there and if I have the lt77 will the rover dealer still swap it out for the recall someone mentioned earlier in this post? thanks
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