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Thats a matter of opinion and everyone seems to have a different one. Some say you should use what New Holland now recommends for the 9N/2N/8N, which is their 134 spec fluid. Its thinnner, the lift probably won't work as good unless you have converted it to a NAA piston and seals, and it doesn't have as good of a lubrication qualities for the gears in the gearbox and differental as the heavier gear oil would. Some others say you should use 90wt GL-1, that Ford speced for the tractors when new. Remember, the engineer who decided that 134 was OK probably wasn't born when your 9N was built. Ford used something that worked and designed the tractor with the intention of the 90 wt being used. The EP gear lubes like the GL-5 you bought, (thats Extreme Pressure, not as in psi or hydraulic pressure but as in the loads imposed on lubricant trying to keep two gears lubed as they mesh together under loads) are made EP using Sulfur based additives, thats why the stuff stinks so much. Some say the sulfur attacks the bronze used in the bushings of the early Ford tractors. What is different about the bronze in those bushings and the bronze in later transmissions is a mystery to me, but that is the message being passed around. How long it takes to damage the bronze is, to me at least, unknown. I suspect it takes years to do any damage, but I really don't know. Some will tell you the stuff you bought is OK, and that the EP additives really don't do damage to the bushings. Those are the three trains of thought you will receive if anyone choses to answer this. My two cents worth. Charles
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