'66 Barracuda Leaking Power Steering Fluid

The exhaust manifold can stay on. A 1966 should have the TRW power steering pump. It looks almost identical to the later Federal pump (sometimes called "Chrysler). The difference is that the TRW has a longer finger on the rear bracket w/ 2 aft bolts into the pump. For photos, see the Bouchillon Performance website's brackets. You can buy a rebuild kit. I paid <$20 for an Edelmann kit at rockauto ~10 yrs ago. The most common leak is the large circumferential O-ring which seals the sheet-metal round reservoir to the pump body. Easy fix once off the car. That holds no pressure, just gravity and leaks because it gets old hard & cracked. You might buy just an O-ring at McMaster-Carr. If you make one from a kit from straight O-ring stock, install with the glued seam at the top and shouldn't leak if you don't fill the reservoir that high. If you rebuild, my trick to hold the blades in while assembling was to wrap them tight with steel wire to compress the springs, which then slid off as I pushed the rotor into the housing.

The gearbox usually leaks from its lower shaft seal. One trick to pop it out (a former mechanic related) is to remove the snap ring (after removing Pitman Arm using the proper puller, inexpensive at Harbor Freight). Then run the engine and turn the steering which should build pressure to blow the shaft seal out into a bucket you smartly placed below. Secondary benefit is that should flush out any crud which collected in the bottom. If that works, it is easier pulling the gearbox out of the car. You can buy a re-seal kit for it too, and I rebuilt one. The trick is to turn the input shaft ccw (recall) and hold that to keep all the plates tight and in place as you slide the innards back in. If not, the plates can shift off-center and the box won't work right. The little O-rings at the top spool valve housing can also leak, and those are easy to change in the car. I used better Viton O-rings there (HF kit).