I posed this same question a year or 2 ago on this forum. Mine is an 89' F-150 with the Mazda 5 speed stick. I got enough opinions to make me call Lucas and ask them. They (Lucas engineering) said to drain the gearbox and refill with Lucas synthetic or any other GOOD quality synthetic automatic transmission fluid and add 1 quart of Lucas automatic transmission conditioner. Do Not use heavier gear oil. Mine has 214,000 miles on it and so far so good. The yoke on my rear differential came loose on mine. Replaced the nut with lock tight and torqued to spec, so far so good also.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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