I have an LT77 in my truck and used Mobil One ATF for years. Whenever I got the least bit aggressive with shifting I always heard the synchros grind. I searched a number of British sites and learned that Land Rover apparently recommended ATF for my transmission to make shifting easier in cold climates. Further investigation revealed that Red Line MTL was the fluid of choice. It's all I've used since. Now, should I get carried away pulling away from a stop light I don''t have to worry about the synchros!
The LT77 is close enought to the R380 that I would recommend you give it a try. If you don't like it, change it. It's not so great an investment that a little experiment is going to break the bank.
Of, and as Terry said, I do have a couple of LT230's should you need one!
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