Don't think there is much you can do to a 450 pump except replace seals.
The aftermarket pump is probably a M&W or Hydreco. Don't know what they are rated for. Hydreco probably made the M&W unit. I have several of those pumps but have never installed them and don't know how they perform.
I doubt if you will find a stronger gear than the IH cam gear. I am not saying it is strong. Just doubting whether an aftermarket supplier offered an alternate. That gear was beefed up with the advent of the IH live hydraulic system as found on the SM.
If you have a need for more pressure than 1200 psi, you should go with slightly larger hydraulic cylinders for more lift or do something like what is pictured below. Northern Tool has them for around $520 or they can be found in truck salvage yards.
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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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