Turning a manual-steer classic or workhorse into something you can guide with two fingers feels like a small miracle. It can also stir up a hornets’ nest of half-truths and garage folklore. I have handled conversions on trucks with farm scars, muscle cars with drag-race pedigrees, and daily drivers that saw three winters’ worth of rust before anyone touched a wrench. Patterns emerge. The same myths repeat, and they cost owners time, money, and confidence. Let’s clear the fog with straight talk and practical detail.
Myth one - Power steering kills road feel
The root of this myth is a bad sample set. Many folks first experience power assist in a worn-out sedan with a leaking pump and a soft-valved box. That soup can steering is not what a healthy power steering setup feels like, especially after a thoughtful manual to power steering conversion.
On a good conversion, road feel depends on three things. Valve calibration inside the steering gear or rack, the ratio of the box, and the stiffness and geometry of the linkage between the wheel and the box. Put a fast 12.7:1 box in a lightweight car, and you get crisp response without a dead zone. Choose a lazy 16:1 truck box with soft torsion-bar valving, and you feel a little float at center, but you also get less kickback on potholes. There is no single power steering feel. There are hundreds, defined by engineering choices.
I keep a simple rule. Get the box or rack right first, then protect feel with rigid connections. An aftermarket steering shaft with quality needle-bearing U-joints maintains a solid mechanical link. A sloppy rag joint, even on manual systems, is the big thief of feedback. When people test drive my conversions with proper universal joint steering couplers, they come back surprised that feel improved rather than dulled. If your converted car feels numb, you can usually trace it to a mismatched box, flexy lower column, deteriorated couplers, or tires set to the wrong pressure.
Myth two - Conversions always require welding and fabrication
Sometimes, yes. Often, no. This myth dates back to the era before well-developed steering box conversion kits existed. Today, for many popular platforms, a power steering conversion kit is designed to bolt into factory holes, line up with factory column dimensions, and clear OEM or common aftermarket exhaust manifolds. Early Mustangs, A-body Mopars, and square-body Chevy trucks have off-the-shelf solutions with brackets, hoses, and the correct pitman arms.
The outliers still keep us honest. Headers on small-block swaps can crowd the box. Long-tube designs, in particular, can clash with the sector housing or the pump brackets. Four-wheel-drive trucks bring front driveshaft and crossmember geometry into the conversation. On those, I measure twice and mock up with the engine loaded on its mounts, not hanging on a hoist. If minimal fabrication is needed, it is often a simple notch on a heat shield, a relocated return line, or a steering shaft length tweak. With a collapsible aftermarket steering shaft that uses DD or splined sections and a steering universal joint at each end, you gain routing flexibility without compromising safety.
Bottom line, the need for fabrication depends more on the car’s current modifications than on the conversion itself. Stock-ish cars often bolt up. Heavily modified cars sometimes need an hour with a die grinder or a welder. That is not a deal breaker, just a planning item.
Myth three - Power steering always leaks and leaves you stranded
Bad hoses and ancient boxes leak. Clean assemblies using modern seals and proper hose routing generally do not. The old Saginaw pumps had a reputation for weeping if the cap O-ring hardened or the return line kinked. That history approaches myth when people apply it to new parts installed correctly.
The failure pattern I see most after manual to power steering conversion projects is not leaks. It is aeration. People route the return line into the reservoir above the fluid line or they use too-tight bends that choke flow. Air gets whipped into the fluid, the pump groans, and the oil foams out of the cap. It looks like a leak, but the root cause is plumbing or improper bleeding.
Bleeding is boring, but it is the fix. With the front wheels off the ground and the engine off, cycle lock to lock fifteen or twenty times to purge air in the gear and the lines. Top up as bubbles disappear. Only then do you start the engine for a few seconds, top up again, and repeat until the foam is gone. A clear return hose temporarily plumbed to a catch bottle lets you see air leaving the system. After this ritual, a sound pump stays quiet and dry. If it still weeps at the shaft, you either have a defective unit or the pulley is misaligned and loading the front seal.
As for being stranded, a power steering system that loses assist still steers. It gets heavier, especially at parking speeds, but it will get you home. If the belt breaks on an older combined pump and water pump drive, that is a different issue. Keep spare belts and inspect tensioners.
Myth four - It ruins originality and tank the car’s value
Collectors debate originality like philosophers argue over language. The real market is more practical. On driver-grade classics, especially trucks and muscle cars with factory drum brakes and manual steering, upgrades that make the car safer and more usable often lift value. A reversible conversion with a steering box conversion kit that retains factory mounting points and a steering column that can be returned to stock rarely hurts long-term value.
For concours-level restorations, the bar is different. If you own an investment-grade survivor, keep it as built. If you want assist without visible changes, there are electric hydraulic pumps you can hide, or electric columns that preserve the engine bay. Those require careful selection and often cost more than a traditional hydro pump and box, but they maintain an original look for most engine compartments. Again, the market segment matters. A working restomod fetches a different buyer than a museum piece.
I keep pictures and a documentation folder for every conversion. Part numbers, torque values, alignment specs, hose routing photos. When it comes time to sell, the next owner sees professionalism, not hacks. That paperwork matters almost as much as the parts.
Myth five - A rack is always better than a box
Rack and pinion is not magic. It can sharpen response because there are fewer joints and less compliance, but the steering geometry and chassis flex set the ceiling on precision. Many classic frames were never built for a rack crossmember, and some aftermarket rack kits bolt to thin sheet-metal or use long tie-rod adapters that introduce extra leverage and bump steer. I have driven box-equipped cars that feel tighter than rack conversions done on flimsy brackets.
The rational approach is to choose the system that integrates cleanly with your suspension design. A well-matched steering box conversion kit with the correct pitman and idler geometry often preserves camber gain and Ackermann better than an add-on rack. On coil-spring subframe cars, a properly rebuilt Saginaw or Delphi box with higher effort valving and a modern variable ratio can feel superb. Trucks that regularly see potholes and loads do better with a stout box that survives hits, not a rack with delicate inner joints.
If your platform has a proven rack solution with a real crossmember and tie-rod geometry engineered for your spindle height, go for it. If not, a strong box with crisp valving is the reliable path.
Myth six - Steering shafts and joints are an afterthought
People will spend a month debating gear ratios and then reuse a forty-year-old rag joint. That is like bolting racing pads onto rusty rotors. The shaft and joints are the fidelity link between your hands and the road. Play or binding here ruins everything else.
I recommend purpose-built aftermarket steering components in this area, especially a collapsible shaft with internal slip and double-D or splined ends for serviceability. Use a quality steering universal joint at each change in angle. Aim for joint angles under about 35 degrees, less if you can, and split the angle across two joints when the header or mount forces a bend. If a single U-joint is maxed out, the wheel will stiffen or snap back through part of its travel. Test this with the front end off the ground, engine off, cycling lock to lock. Feel for tight spots. If it binds, the fix might be as simple as clocking the joints to get phasing right or adding a support bearing to shorten the free span of the shaft.
I also treat fasteners here like critical hardware, because they are. Grade 8 or better, heads accessible for inspection, and witness marks on the bolt head and yoke to catch loosening at a glance. A drop of medium threadlocker is good insurance where the manufacturer permits it.
Myth seven - Fluid is fluid and hose is hose
Hydraulic systems live or die on correct fluid and plumbing. Steering pumps and boxes were designed around specific viscosity and additive packages. Some older units want Type F or Dexron variants. Many modern pumps prefer specialty power steering fluid. If you use fluid that is too thin, the pump cavitates when hot. If the wrong additives attack seals, your “leak” shows up in a month. Read the spec sheet that comes with the gear or pump and stick to it. If you bought a used pump, check the donor application.
Hose matters just as much. A high-pressure line carries well over a thousand psi at peak. The return line sees far less but still needs to handle heat and oil. I replace both during a manual to power steering conversion even if they look decent. Old hoses shed rubber inside, sending grit into the valves. I route with gentle bends, no tighter than a radius equal to six times the hose diameter. I keep the return submerged in the reservoir to avoid aeration, and I mount the cooler, if used, where it gets airflow without inviting road debris.
If you plan long highway miles or mountain descents, a small power steering cooler is cheap insurance, especially on heavy trucks and cars with big tires. Heat is the enemy of pump bearings and seals.
Myth eight - The steering box ratio decides everything
Ratio sets how much wheel input you need for a given tire angle, but the overall steering behavior is a triangle. Ratio, caster, and tire construction share the workload. For example, people install a quick box to feel sporty, then set caster low to keep steering light, and they end up with twitchy high-speed manners. Instead, I start with a moderate variable ratio box around 12.7 to 14:1 on most cars, then dial in caster between 3 and 5 degrees depending on the platform and tire. More caster adds self-centering and straight-line stability at the cost of heavier parking effort. On trucks with big all-terrains, too much caster makes parking unpleasant, so I stay conservative and lean on tire pressure and pump valving to get the effort right.
Tires themselves are a huge lever. A stiff sidewall performance tire on a lightweight wheel reacts instantly. A tall truck tire with deep tread blocks deflects, adds delay, and can generate a squirmy feel at lane-change speeds. If your converted steering feels inconsistent, look first at alignment and tires before blaming the box.
Myth nine - You can reuse all the old manual parts
Sometimes you can. Often you should not. The pitman arm spline count might match, but the drop and length can be different between manual and power gears. Using the manual arm on a power box can alter steering geometry and reduce turning radius. Linkage that just barely cleared with a skinny manual box might now touch a larger power housing at full lock. Old idler arms and center links with worn bushings bring play that the added assist only masks, until you wonder why it wanders on the freeway.
During a conversion, I inspect every steering and front suspension joint and replace anything with measurable play. On many platforms, the correct path is to use the pitman arm specified for the power gear, not the manual unit. A complete steering box conversion kit usually includes the right arm or notes the correct part number. Trust those notes. Shortcuts here cost more later.
Myth ten - Electric power steering is always the smarter modern choice
Column-assist or EPAS units are attractive. No pump, no hoses, and you can tune assist with a knob on some systems. They shine in small engine bays or when you want a clean engine-driven accessories layout. But EPAS has trade-offs. Column units assist above the universal joint, so you still feel slop or deflection downstream. If your steering box, linkage, or intermediate shaft has play, EPAS will assist that play. On heavier vehicles, thermal limits can reduce assist during long parking maneuvers. And some universal EPAS kits transmit a faint vibration or cogging feel through the wheel that sensitive drivers notice.
Hydraulic assist still dominates when you need durability under heat, rock-solid feel through a robust box, or easy service with widely available parts. I choose EPAS for light coupes with tight engine bays, for restomods where the owner values a tidy look, or when noise from a pump would spoil the character of the build. I choose hydraulic for trucks, factory-style restorations, and anything that will tow or see long hot drives.
How to think through a conversion like a pro
- Start with the end use. Daily driver, autocross toy, tow rig, or long-distance cruiser. Define effort and feel targets before shopping. Select the gear with proven fitment. A steering box conversion kit built for your chassis beats improvising brackets. Plan the connection. Use an aftermarket steering shaft with proper collapsibility, a support bearing if the shaft spans more than about 18 inches, and a steering universal joint at every angle change. Align the whole system. Set caster, camber, and toe to values that match your tire and speed profile, then road test and fine tune. Treat plumbing like a system. Correct fluid, hose quality, return submergence, and careful bleeding keep it quiet and reliable.
Notice that none of this is exotic. It is about respecting the chain from your hands to the contact patch and making each link solid.
Real-world snapshots from the shop floor
A 1969 Camaro arrived with manual steering and long-tube headers. The owner wanted power assist without cutting the car. We used a modern quick-ratio Saginaw-based box, pump brackets that pulled the pump inboard for belt alignment, and a compact double U-joint arrangement to sneak past the header primary. A steering universal joint at the column plus another at the box, with a support bearing on the frame, eliminated bind. We set 4 degrees of caster, 0.5 degrees of negative camber, and a hair of toe-in. The owner expected a luxury-car feel. What he got was fluent feedback and one-finger parking. No leaks, no drama. The key was the shaft phasing and the support bearing location, not a fancy box.
On a square-body Chevy half-ton that pulled a boat, the myth about racks being better came up. The customer wanted a rack to “feel like a new truck.” We installed a stout remanufactured box with firmer valving, a cooler in front of the radiator, and fresh linkage. Tires were moved from 50 to 44 psi to balance wear and effort. With caster set to 3.5 degrees and a true center on the box adjustment, the truck tracked hands-off. He stopped asking about the rack after the first weekend of towing.
A Fox-body Mustang with EPAS landed for a rattle at the column. The issue was not the electric unit. It was the worn lower shaft Borgeson steering box bearing and a rag joint with missing fabric. EPAS masked the slop by reducing driver effort, but geometry does not lie. We fitted an aftermarket steering shaft with double-D sections and a quality U-joint, re-centered the column, and the strange on-center numbness vanished. Assist stayed, feel returned.
Cost, time, and the parts that are worth the money
Budgeting for a conversion helps prevent compromises in the wrong places. A quality power steering conversion kit for a popular classic can range from 800 to 2,000 dollars depending on whether it includes pump, brackets, hoses, and the correct pitman arm. Add an aftermarket steering shaft with two U-joints and a support bearing for 200 to 500 dollars. Miscellaneous belts, fluid, cooler, and fasteners can add another 100 to 300.
Labor varies wildly. A straightforward bolt-in on a clean car can be a Saturday. Throw in headers, rusted fasteners, and a crowded accessory drive, and you might spend a weekend or two. Shops bill anywhere from 8 to 20 hours depending on the platform and the surprises.
Spend money where it counts. The steering gear itself, the shaft and joints, and the hoses. Do not chase bargain-basement U-joints or reused hoses. Pumps are more forgiving if aligned and not over-tensioned, but I still prefer new or properly remanufactured units with a warranty. If you are forced to compromise, keep your original manual parts on a shelf. Reversibility is a safety net.
Safety margins and small details that matter
Before the first test drive, I do a dry lock-to-lock cycle with the engine off and the car in the air. I am listening for binding and watching clearances. The pitman should not kiss the frame, the shaft should not touch headers at any angle, and the return-to-center should feel smooth. After the first drive, I re-check all fasteners, look for witness marks creeping, and scan for seepage. People forget that steering systems shift slightly as bushings take a set. A quick retorque after 100 miles is cheap peace of mind.
Torque specs matter. Pitman arm nuts are usually in the 170 to 200 ft-lb range, idler arm bolts in the 35 to 55 range depending on size, and steering column pinch bolts in the 25 to 35 range. Always verify for your platform. Over-tightening a U-joint pinch bolt can distort the yoke and bind the joint. Under-tightening invites a slip you will only experience once.
Heat soak shows up on summer days. If the pump sits near headers, a small heat shield between the header and the pump body keeps fluid temperatures in line. Route hoses away from sharp edges with P-clamps and abrasion sleeves where they cross brackets. If your car sees gravel roads, a simple mesh guard in front of a steering cooler prevents rock damage.
When to keep manual steering
If you own a featherweight roadster with skinny tires and you love the purity of manual feedback, your car is a good candidate to stay manual. Autocrossers sometimes prefer manual to keep steering effort consistent across long slaloms where a pump’s valving can vary assist with RPM. Drag cars with big front runners, manual racks, and limited steering angle do fine without assist. A daily-driven half-ton with 275-width tires and parallel parking in its future is a different story. Choose based on use, not on folklore.
The role of matched components
Conversions succeed when parts complement each other. An integrated steering box conversion kit that pairs the right box, pitman arm, and hoses, matched with an aftermarket steering shaft designed to clear your headers, and supported by quality universal joint steering couplers, gives you the platform. Proper alignment, correct fluid, and thoughtful routing add longevity. That is the formula that has kept my customer cars quiet and precise years after the install.
Steering is more than turning the wheel. It is a system that translates intention into a controlled path. When you hear someone dismiss a manual to power steering conversion with a shrug about leaks or lost feel, remember what is really being judged. Usually it is a bad past installation, not the concept. Build the chain strong link by link, and you will not only debunk the myths, you will forget why they ever sounded plausible.
Borgeson Universal Co. Inc.
9 Krieger Dr, Travelers Rest, SC 29690
860-482-8283