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If I'm understanding you correctly, that's basically how a Sweet servo works. Spliced into the steering shaft and opens/closes hydraulic ports. Cheap/easy way to add hydro-assist to a vehicle with a manual steering box, and there are lots of other uses for them too.

Oh, well yeah, I'd use that in conjunction with hydro-assist. In my case, I'd still use that 3" double-ended steering cylinder I got from PSC. Think we've figured out a pretty slick way to do this, but the guy I've been talking to about it is building a new Ultra4 racecar and has asked me not to...

Hydraulic assist with mechanical linkage is great if that meets your needs, but the stock steering linkage doesn't work for me, for reasons that I explained earlier in this thread (and others). Oh, but there are potential benefits! By maintaining something like mechanical linkage, but using...

There might be another option. Over on pirate we've been discussing the possibility of using something like a traditional power-steering box to operate a hydraulic cylinder (master) that would be connected with hydraulic 'steering linkage' to another hydraulic cylinder (slave) mounted on the...

When the engine is off, a full-hydro system is going to function just like any other power-steering system with mechanical linkage. You can still steer, you're just pushing fluid through the lines manually. So I don't think any of the performance-based requirements would be a problem. I'm...

I was talking about full-hydro steering, and was only making a comparison to lift kits in order to illustrate a point. I was hoping that you'd be able to point me to something specific. I haven't read those DOT standards, but I know that many people have - and to-date, nobody has found anything...

Can you please cite something specific? I'd just like to know if indeed I am wrong, and I'd like to be able to share any reference you provide with other people I know that would be equally interested. Yeah, there are some specific rules related to lift kits and bumpers and other modifications...

...and I've gotta dispute the likelihood of failure in a mechanical vs. hydraulic system. What makes hydraulic hoses any more prone to failure? It's all about proper engineering. A good system isn't going to put those hoses in harm's way, and those hoses are TOUGH. What else is there to worry...

More importantly, nobody has ever been able to cite a specific rule that makes full-hydro steering illegal (somebody posted a $ bounty on pirate years ago that has never been claimed). Full-hydro steering isn't any more or less illegal than any other modification that could be deemed unsafe...

I don't mean to be argumentative, but I want to clarify something about full-hydro systems. If the engine dies, you're not going to loose all ability to steer the vehicle. You're just going to lose the power generated by the hydraulic pump, much like any other power-steering system. The only...