I drove my swap for a few miles without power steering. Tooling around daily whatever stuff you probably wouldn't miss it much, but offroad or backing up a trailer? You'll want PS.

I cut the steel ends off my power steering lines on the Yota side and brazed JIC fittings on them. The MBZ power steering pump actually worked just fine with a standard JIC fitting, which was seriously convenient. Then had a local hydraulic shop fab up some hoses with JIC fittings.

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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap