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For my SAS I decided to add hydraulic steering assist as it comes in real handy for rock crawling. I got the Redneck Ram setup from the folks at West Texas Off-road that includes rebuilding an earlier IFS steering box along with drilling and tapping the box for the included ram. One of the down sides of adding a ram is that it slows the steering down because the stock steering pump has to supply the added volume for the hydraulic ram. Another is that it creates a fluid volume change in the system reservoir that needs to be compensated for in some way. After doing some reading on the West Texas site about how to go about modifying a Saginaw pump and reading up on earlier Toyota pump mods for steering assist setups on the Pirate board, I decided to give it whirl and see what I could do about the Tacoma pump. Chuck Gardella was kind enough to supply me with a blown pump that I could rebuild and submit to my endless fiddling and tinkering. I plan to give him my pump in return when I get this one done and installed. You need to do something to allow for more room in the reservoir for the standard hydraulic ram assist setup so I decided to tackle the reservoir first. The reason you need the extra space is because the ram is unbalanced. That is there is a rod on one side of the cylinder and not on the other side so the volume of the fluid has to change in the system to account for the volume of the rod as it travels back and forth. I calculated the volume of the rod that I have at full stroke to be about 2 oz or so. This would equate to plus or minus up to 2 oz. in the pump reservoir. Well first off, it’s no wonder why so many folks boil their steering pumps over with heavy wheeling and have so many other steering problems. The stock power steering reservoir doesn’t even rate pint sized
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