'M'ore tranny help

glennster's post above has got the proportions and the process pretty well covered. Stick with that, and you'll accomplish what you want to do.

As a sidenote to what glennster said about making a wire loop to dig out sludge -- I dug more than a quart of hard dry sludge out through the drain of my BN tranny (five QUART capacity, thank you very much!), before it ever started to drain and and got another quart of lumpy stuff while it was draining. It was low from leaking anyway, so it was probably 50% sludge in there. It got opened up and a good cleaning, but I tell the story just to reinforce the point that you can't always gauge how much oil is left by how much you drain out in a case like that.

What I'd say is that there isn't much advantage to running kerosene with your new oil. That would be a waste. IH used to recommend thinning the gear oil with kerosene in cold weather, so you're not going to hurt anything. I always feared, though, that running straight kerosene for any length of time would just open up new leaks. Perhaps an unfounded fear.

Were it mine . . . I'd drain about three/three-and-a-half gallons of the old out, and replace it with kerosene. Run it around for a while, long enough for it to warm up some, making sure to use each of your gears, and have your PTO running for at least part of the time.

Drain while warm, then refill with your new.