Crunchy Box

[350matt]

Now I know the Rover LT77 Box isn't the best in the world, but does anyone have any reccommendations for oil type? I'm currently runnning 2/3rds ATF and a 1/3rd Engine oil as reccommended by the chaps who rebuilt my box about 4K miles ago. It's got better with use but it's still sometimes reluctant to go into 1st and 3rd is now becoming reluctant. I changed the oil (rebuilt box an all that) about 2K miles ago. I have heard rumour of some wizard zippy oil which made these boxes a lot slicker shifting. Any ideas? Matt