1965 Mustang Steering Linkage Diagram: Layout, Parts and Checks

The 1965 Mustang steering linkage layout

The factory linkage on a 1965 Mustang is a parallelogram design. On the driver side, a recirculating-ball steering gear bolts to the left frame rail, and a pitman arm is attached to its output shaft. The pitman arm connects to one end of a long center link, sometimes called a drag link or relay rod. The opposite end of the center link is supported by the idler arm, which pivots on a bracket bolted to the right frame rail. Two tie rod assemblies run outward from the center link to the steering arms bolted to each front spindle. Each tie rod is made of an inner end, an outer end and a threaded adjusting sleeve held by clamps.

Reproduction shop manuals and parts catalogs show these same basic components, but a car with factory power steering adds a hydraulic control valve and a power cylinder to the linkage, and several parts are not the same as on a manual steering car. Treat any diagram as a map of how parts connect and in what order, not as a source of dimensions or tightening values.

How the linkage steers the wheels

When the steering wheel turns, the steering gear converts that rotation into a swinging motion of the pitman arm. The pitman arm pushes or pulls the center link sideways. Because the idler arm is the same effective length and swings parallel to the pitman arm, the center link moves across the car while staying roughly parallel to its original position. The tie rods carry that sideways movement to the steering arms, which pivot each spindle on its upper and lower ball joints so both front wheels turn together.

Every connection in this chain must allow movement while still transmitting steering force without slack. The tie rod ends and the pitman-to-center-link joint use ball-and-socket designs, and the idler arm pivots on its bracket. Wear in any of these joints shows up as lost motion between the steering wheel and the tires. The adjusting sleeves serve a different purpose: turning a sleeve lengthens or shortens a tie rod, which is how toe is set during a wheel alignment.

What changes the diagram for your car

The biggest difference is manual versus power steering. Factory power steering on these cars is a linkage-type system: a control valve sits at the pitman arm end of the center link, and a hydraulic power cylinder connects between the center link and a bracket on the frame, with hoses running to the pump. A power steering diagram therefore looks busier, and the center link and related pieces are specific to that system. Ordering manual steering parts for a power car, or the reverse, is a common mistake.

Other variables include the engine fitted at the factory, early versus later production, and anything a previous owner has changed. Many Mustangs have been converted to rack-and-pinion steering, fitted with aftermarket power steering kits, or lowered, and a car with a rack conversion will not match the factory drawing at all. Altered ride height also changes linkage angles, which can affect toe change over bumps. Related Ford compact cars of the period used similar designs, but do not assume parts interchange without confirming them against the actual parts on your car.

Inspecting the linkage safely

Start with proper vehicle support. Park on level, solid ground, chock the rear wheels, lift with a suitable jack at a recommended point and place jack stands under the frame or other locations specified in the service manual. Never work under a car held only by a jack. For checking joint play, it often helps to leave the wheels on the ground or the suspension loaded, because some looseness can hide when the front end hangs freely.

With the engine off, have a helper rock the steering wheel back and forth in small movements while you watch each joint in turn: pitman arm to center link, the idler arm pivot, and the inner and outer tie rod ends. Any joint where one side moves before the other has play. Also look for torn dust boots, dry or rusty joints, bent tie rods, loose adjusting sleeve clamps, a loose idler arm bracket, loose steering box bolts and cracks around the mounting points on the frame rails. On power steering cars, check the control valve and power cylinder for fluid leaks and damaged hoses. If the joints have grease fittings, lubricate them at the intervals the manual recommends.

When replacing parts, confirm whether the car has manual or power steering and compare each new part with the old one before installation. Measuring the overall length of the old tie rod assembly, or counting exposed threads on the sleeve, helps the new one start close to the previous setting. Keep tapered studs and their holes clean and dry, use the correct fastener specification from the factory manual, and install new cotter pins as the manual directs. After any tie rod or center link replacement, have a proper wheel alignment performed rather than relying on the rough setting.

Limitations and when to get help

A written description and a general diagram cannot confirm what is actually installed on a particular car, especially one that has been restored or modified. This guide deliberately gives no torque values, alignment settings or wear limits; take those from the factory shop manual for your model year and steering type, or from the instructions supplied with the replacement parts.

Get a qualified suspension and steering shop involved if the steering box itself is loose or worn, the power steering binds, leaks or feels uneven, any frame mounting area is cracked, parts appear bent after an impact, or the car cannot be brought into a normal wheel alignment. Noticeable free play, wandering or clunks over bumps are reasons to have the linkage inspected before the car is driven further.