Step-by-Step Guide to Handbook to Power Steering Conversion

Power steering changes the character of a car. On a tight switchback, throughout a three-point turn with a trailer, or pushing a parallel parking spot into submission, assist turns effort into precision. If your vehicle or truck rolled off the line with a handbook box, converting to power help can seem like a discovery. It can also fail if you approach it as a quick bolt-on. Steering is a system, not a single part, and little decisions cascade into huge repercussions. This guide strolls through the conversion with the same care you must bring to the task, mixing mechanical information with the judgment that just shows up after a few knuckle-busting installs.

Clarify your goal and your baseline

Start with your goal for the lorry. A vintage half-ton pickup that spends weekends at the lumber backyard, a pro-touring 60s muscle automobile, and a rock-crawling trail rig ask different things from a power steering system. Help level, guiding ratio, packaging, heat management, and reliability all track back to utilize case.

Your standard matters just as much. Manual systems normally fall under 2 classifications. One, a recirculating-ball steering box with a pitman arm, drag link, idler, and center link. Two, a rack-and-pinion layout, more typical on lighter, later vehicles. Most manual boxes can be swapped for a power box in the same chassis family, often using a steering box conversion package created for that platform. Manual racks are generally changed with an assisted rack that bolts into the initial subframe, however those swaps often entail pump and hose pipe routing constraints that vary from box-type conversions.

Measure what you have. Note the guiding column shaft size and spline count, the input angle relative to the firewall program, and the distance from the column exit to package input. Take photos of linkage geometry at trip height. Count your existing ratio by turning the wheel lock-to-lock and comparing to pitman arm travel. Record those details now, and you prevent the most typical mistakes later: mismatched input splines, universal joint bind, and geometry that eats idler bushings for breakfast.

Choosing the path power box, power rack, or electric assist

Most store conversions fall under among 3 classifications, each with its own trade-offs.

A box-to-box swap suits traditional body-on-frame cars and trucks and trucks with factory-style linkages. A steering box conversion package for a given chassis usually consists of the power box, appropriate pitman arm, frame adapters or plates, and often hose pipes and a rag joint or a compact steering universal joint. The benefit is durability and predictability. Parts are simple to service, and you keep the initial linkage architecture. The drawback is packaging weight and some on-center feel that can be less crisp than a terrific rack-and-pinion.

A rack swap makes sense when a subframe is compatible with an assisted rack from the same platform family. Steering action improves, and effort feels more direct. You will need to control bump guide. With a manual rack, somebody probably shimmed tie rod ends to calm toe modification. A power rack that sits a few millimeters higher or lower can reverse that work. Intend on determining and shimming to get tie rod and lower control arm arcs aligned.

Electric column help is the third path, significantly popular on classics where space is tight or the engine has no accessory drive for a pump. An electrical unit sits in-line with the column and includes torque straight to the shaft. It avoids hoses and pump brackets. It does not repair sloppy linkage, and on heavier trucks the assist can feel wooden if the linkage is used. For sturdy or high-heat use, hydraulic power still wins for resilience, particularly off-road.

Parts planning without the surprises

A neat swap is won or lost in the parts prepare. Before a single fastener relocations, lay out whatever and test-fit on the bench.

The pump should match your box or rack. Saginaw pumps are common and tolerant, but flow and pressure matter. A common recirculating-ball box wants approximately 2.5 to 3.0 gallons per minute and 1,100 to 1,300 psi. Lots of pro-touring builds choose slightly lower flow for better feel. Inline restrictors and various valve springs in the pump can tune assist. Order the appropriate bracketry so belt positioning is right, and make certain pulley diameter fits crank and accessory ratios. A small-pulley, high-rev setup will heat up fluid and whistle the pump.

A power steering conversion package generally covers the big products. In a lot of cases, you will still need an aftermarket steering shaft or a pair of compact steering universal joints to bridge from your existing column to the brand-new box or rack input. Space shrinks quick around headers, brake boosters, and downpipes. A double-D shaft with two joints, or a joint and a carrier bearing, can snake around obstacles without bind. Universal joint guiding joints should run at practical angles. Keep each joint below about 35 degrees and go for symmetry. Unequal angles develop cyclic velocity changes that you feel as a pulse at the wheel.

Hoses and fittings choose the job's tidiness and reliability. Pressure is generally a crimped hose pipe with suitable flare, O-ring, or banjo ends. The return line can be push-lock on low-pressure systems, but consider a barrier hose if temperatures run high. If you path lines near exhaust, include heat sleeve. A power steering cooler is cheap insurance coverage in trucks that tow or automobiles with long, sluggish climbs. Lots of factory setups hide a small loop cooler in front of the radiator. Include one if your set does not have it.

Fluid choice is not an afterthought. Some systems call for dedicated power steering fluid, some for ATF. Match the pump and box maker's spec before you buy. Mix-and-match fluids swell seals and welcome leaks. If your package includes a steering box resealed for modern-day fluids, utilize what they specify.

Finally, alignment tools save time. A digital angle finder for the column and shaft, a basic toe bar, and a way to focus the box or rack will keep you out of the weeds.

Safety and preparation that pros follow

Good conversions feel uninteresting to drive in the best way. The steps that get you there beware, systematic, and unglamorous. Raise the lorry onto stands at frame points, not manage arms, so the front suspension droops. Get rid of the battery ground to secure electronics and yourself. Mark steering wheel center and lock it with a strap so it can not spin freely when the shaft detaches. A wheel that whips with force can hurt fingers or snap a clockspring in later-model columns.

Soak old fasteners with penetrant the night before. Manual boxes frequently share corroded frame bolts with engine mount brackets. Backing them out without prepping can twist captive nuts in boxed frames. If you feel resistance that spikes, stop, heat in charge, and work the fastener gently. Split frames happen when someone rushes.

Removing the manual system without damage to geometry

Disassembly has one main rule. Preserve recommendation points. Scribe the pitman arm on package output shaft. Step the drag link length between known points. Examine tie-rod lengths and record them. When you put the power system in, you will begin with these recommendations, then adjust.

Pull the guiding column coupler or rag joint. If it is the initial material joint, expect it to fall apart. That is not a flaw in your method. It is an indication that it was due for replacement no matter what. Break the manual box fasteners last so the assembly stays stable while you work on linkages. Utilize a proper tie-rod end separator or a pickle fork where suitable, and safeguard boots if you plan to reuse ends.

When the handbook box is complimentary, check the frame location where the brand-new box will live. Search for hairline fractures around mounting holes, thin or delaminated layers on riveted brackets, and rust. If the package consists of a support plate, mock it up and inspect bolt positioning before you paint.

Mounting the power unit for strength and alignment

Box-style conversions depend upon bolt pattern, angle, and pitman arm positioning. Dry-fit the power box with the adapter plate if included. Numerous chassis use three bolts that pass through a boxed section. Use the provided grade-8 hardware and torque specification. On older GM frames, I have welded a perimeter stitch around the adapter plate after mock-up on trucks that see snow rakes, simply since repeated side loads fatigue frames. For a street automobile, the plate and hardware are sufficient if the frame is sound.

Center the box before setting up the pitman arm. Turn lock to lock, count the turns, then back to center. Install the arm on the indexed spline if present. If the spline is not keyed, use your scribed marks and the drag link length to set the arm near level at ride height. An arm that starts misaligned shows up as unequal left and right turning radius.

Rack swaps follow comparable reasoning. Bolt in the rack loosely so you can push it for finest tie-rod geometry. Numerous subframes have actually slotted mounts for this factor. At this stage, procedure inner tie-rod pivot points relative to lower control arm pivots. The closer these arcs are, the less bump guide you fight later.

Connecting the column with compact, bind-free joints

This action separates neat conversions from hacked ones. Your column output, firewall angle, engine placement, and header tubes inform you what you can get away with. In a small-block A-body with long-tube headers, I often wind up with two compact steering universal joints and a short intermediate shaft, in some cases with a vibrational coupling if the car will see long highway journeys. An aftermarket guiding shaft lets you cut to fit and secure or pin to the joints. Procedure twice, cut once, and leave enough shaft participated in each joint for complete clamping.

Aim for a straight shot if possible. If not, split the angle in between 2 joints with a brief intermediate shaft supported by a heim-style assistance bearing on a bracket from the frame or a stout crossmember. Keep the bearing near midpoint to manage whip. Tighten joint set screws with thread locker and then dimple the shaft with a drill so the set screw has a pocket. Some builders go even more and cross-pin with a roll pin. I book that for race vehicles or vehicles with extreme vibration.

If you reuse a rag joint for isolation, check that its bolt pattern matches the brand-new box. Numerous power boxes utilize a various input spline and flat. A steering universal joint that adapts from your column's spline count to package's input is a cleaner choice and takes less space.

Pump mounting and belt positioning that stay quiet

Pump brackets are where conversions lose time. A pump that sits a quarter degree out of aircraft will chirp or eat belts. With a straightedge throughout the crank and accessory pulley-blocks, line up the pump pulley-block within a millimeter or two. Shim brackets as needed. If you changed to a serpentine system, use a matched sheave diameter so belt wrap remains sufficient around the pump. On V-belt setups, pick a belt width that matches wheels and do not force a narrower belt into a broader groove.

Once the pump sits square, mock the high-pressure line. Avoid tight S-curves that will send noise. Keep at least a finger's width of clearance from exhaust. On a small-block with headers close to the frame, I run the pressure line inside the frame rail and use a heat sleeve where it returns toward the box. Mount the reservoir, whether remote or essential, above pump level so gravity assists prevent aeration. Safe and secure return lines with cushioned clamps. Tough lines are great for long runs in protected locations but leave flexible areas at each end to soak up engine movement.

Plumbing for dependability, not just function

Thread types trigger headaches. Lots of domestic boxes and pumps use SAE inverted flare or O-ring fittings. Racks typically utilize metric O-ring. Confirm before you crank in a fitting that feels close. Aluminum threads in pumps will not forgive a mismatched taper. If your package consists of adapters, tighten up to spec, then mark with paint so you can tell at a glimpse if a joint shifts throughout preliminary running.

A small inline filter on the return line protects a brand-new box or rack from debris. Add one now and change it after the very first thousand miles. If your lorry will tow or sees long low-speed climbs, include a stacked plate cooler in front of the radiator. It is cheap insurance. If the radiator currently fights for air flow, mount the cooler low where it captures inbound air however does not block the core.

Use the fluid the manufacturer calls for. Numerous Saginaw-based setups endure ATF, however boxes developed around particular seal products prefer dedicated power steering fluid. The wrong fluid swells seals, turning your new parts into weepers.

Filling and bleeding so the pump lives a long life

A dry pump dies quick. Pre-fill the tank and some pumps through the return port before the very first start. With wheels off the ground and ignition handicapped if needed, turn the guiding wheel slowly from lock to lock about 15 times. Stop if the fluid foams, let it settle, and top up. Continue till bubbles disappear. View the tank for vortexing at greater rpm later. That indicates bad return routing.

Once initial bleeding surfaces, fire the engine and hold idle. Do not saw the wheel quickly. Alleviate it back and forth and listen. A healthy system makes a soft hiss at full lock as the pressure relief opens, not a squeal. If the pump whines at center, air remains trapped or the return line consumes air at a sharp bend. Close down, let it settle, adjust lines, and try again.

Check every fitting for weeps. A single drop on a paper towel under the box or pump is a sign to retorque. Clean residue so you can spot fresh leakages after a brief drive.

Geometry checks that decide road feel

With the car on the ground at trip height, center the guiding wheel and confirm that package or rack is focused. If the wheel is off however the box is centered, change tie rods similarly left and right to recenter the wheel. Do not move only one side. That shortcuts your toe and Ackermann geometry.

For box systems, validate that the pitman arm is parallel to the idler at ride height. If one sits high, bump steer creeps in as the center link arcs through travel. Adjust by fixing trip height if springs sag, or by replacing used idler bushings. For racks, measure toe modification through 2 inches of bump and droop. An easy bump steer gauge deserves its expense if you do more than one car. Small shim changes can cut in half toe change across travel, which you can feel as stability on rough roads.

Torque every fastener to spec and paint-mark them. I have captured loose column joint set screws that had actually backed off a quarter turn after the first hundred miles. The paint tells the story at a glance.

Test drive procedure that surface areas issues before they injure you

The very first drive is diagnostic. Pick a quiet loop near home, no travelers, no distractions. Feel the on-center. It must be neutral with a light self-center as you loosen up from a corner. If it combats to return, caster is low or the box pre-load is too tight. If it darts or hunts, toe is off or there is compliance in a joint.

A mild slalom at 30 mph exposes universal joint bind. You will feel a rhythmic notch in the wheel if angles are too steep or the joints are misphased. Under braking, note if the wheel pulls. That can be brake imbalance, however newly altered guiding geometry likewise reveals worn lower control arm bushings.

After 10 minutes, pop the hood and check fluid level and temperature level. A reservoir you can not touch for more than a second is too hot. Either the pump is exhausting due to excessive relief operation, or airflow is bad. A cooler and a flow restrictor can change feel here.

Tuning assist and feel for your purpose

Assist is not one-size-fits-all. A grand touring car feels better with moderate assist and a quicker ratio. Aftermarket steering components A heavy trail rig may need complete help however a slower ratio to keep feedback under control on rocks.

You can tune with a few simple tools. Circulation restrictors at the pump outlet calm overboosted boxes. Valve sets inside some pumps let you step pressure down in 50 to 100 psi increments. Attempt little changes, then drive. A steering universal joint with a small vibration isolator puck can alleviate a chassis that transmits too much through a welded column and strong motor mounts. Tires matter more than owners admit. A 275-width performance tire at 38 psi will make any system feel nervous. Drop to 32 psi and the steering mellows in a way no box swap can replicate.

If you began with an aftermarket guiding shaft and two compact joints to clear headers, double-check phasing. The fork ears on each joint ought to be parallel when the shaft is straight. Misphasing creates a velocity variation that seems like play then stiffness as you turn the wheel.

Common pitfalls worth avoiding

Every installer has a list of regrets. Here are the ones that show up consistently in the bay.

• Forgetting to center package or rack before setting the wheel, which leaves unequal turning radius and rub at one lock.
• Mismatched fittings that chew aluminum pump threads, solved by determining thread types and using correct adapters.
• Over-tight belt stress that saves a screech but cooks pump bearings in a season.
• Ignoring frame cracks or thin locations near box mounts, then blaming the box for wander.
• Treating the steering as separated from suspension. Worn control arm bushings and bad positioning will mess up the best conversion.

Anecdotes from the shop floor

A 1971 Chevelle can be found in with a handbook box, 15-inch steering wheel, and a motorist who liked the car but hated city traffic. The owner brought a generic power steering conversion package and desired it installed before a road trip. During mock-up, the package's rag joint would have placed the column at a bad angle around a new header main. Rather of flexing the column bracket, we used a compact steering universal joint and a brief aftermarket guiding shaft cut to fit. The initial fit cleared with a paper's density at the header, which would have become contact once the engine torqued. A small assistance bearing on a frame tab pulled the shaft away another 5 millimeters. 2 hundred miles later he called to state the cars and truck tracked like a contemporary sedan, and, more significantly, absolutely nothing rubbed. That additional hour of shaft work conserved him a melted boot and a sour roadway trip.

On a square-body Chevy truck utilized for raking, the owner wanted help tuned heavy. A stock Saginaw pump ran hot and whined after long pushes. We added a stacked plate cooler, switched to a somewhat bigger pump wheel to cut pump rpm at idle, and stepped pressure down by about 100 psi with a valve kit, which lowered relief biking at full lock with the blade angled. The wheel effort rose a hair, however pump noise disappeared and the truck made it through an entire winter season without a single bleed.

When the aftermarket helps and when it complicates

Aftermarket steering elements exist for a reason. Automobiles seldom leave enough space for perfect shaft paths, and OE parts presume stock exhaust and accessory designs. An aftermarket guiding shaft with double-D areas and compact joints earns its keep in tight bays. The other side is that more joints indicate more places to misalign or loosen. Paint-mark whatever and recheck after a few drives.

A steering box conversion package can save hours if it is engineered for your specific chassis. The best sets include brackets that correct box angle, a pitman arm with the right drop to protect center link geometry, and hoses with the right ends. Be careful of universal sets that declare to fit numerous designs. They frequently leave crucial measurements to you. If you are comfy welding and fabricating, that is great. If not, spend for a platform-specific kit and prevent a winter season of chasing shim stacks.

Universal joint steering hardware is robust if bought from trustworthy providers. Low-cost joints develop play quickly. Prevent mounting a joint right at the firewall software where it will transfer buzzing to the cabin. A small length of shaft in between the column and first joint smooths feel.

Final checks and long-term care

After a couple of hundred miles, flush the fluid if it darkens and replace the return-line filter if you added one. Re-torque frame and box bolts. Glance at your paint marks on the column joints. Inspect belt stress cold and hot, because brackets can settle a little as they discover their place. If you hear brand-new noises at full lock, resist the routine of holding the wheel against the stop. That hammers the pump's relief and constructs heat without any benefit.

Down the line, deal with the steering like brakes, a safety-critical system that deserves attention. If you include a quicker ratio box later or step up to larger tires, revisit alignment. A touch more caster and a hair of toe-in can change straight-line stability with sticky rubber.

A good handbook to power steering conversion does more than lighten effort. It maintains road feel, respects geometry, and withstands heat and time. The parts list does not need to be exotic. Thoughtful options do the heavy lifting. Whether you lean on a power steering conversion set or piece together your own service with aftermarket steering components, invest your effort on fit, positioning, and clean pipes. Get those best and the first parking maneuver after the swap will tell you everything you need to know.

Borgeson Universal Co. Inc.
9 Krieger Dr, Travelers Rest, SC 29690
860-482-8283