Steering & Suspension Inspection

Commercial Van Steering Check – Transit, Sprinter & ProMaster at 100k+

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A Mercedes Sprinter, Ford Transit or Ram ProMaster commercial van racks up 100,000 to 200,000 miles in just 3 to 5 years of delivery work. The steering and suspension components on these vans take a beating from constant stops, potholes and loaded cargo. This inspection guide covers the specific wear points on high-mileage commercial vans.

What the driver feels

  1. The van wanders on the highway, even with an empty cargo bay
  2. A clunk or knock from the front end when hitting potholes
  3. Tire wear on the front inside edges within 15,000 miles
  4. The steering feels heavy or stiff, especially when parking
  5. A groan or whine from the power steering at low speeds
  6. The van pulls to one side, which changes as cargo shifts
  7. Front brake rotors warping or pulsing after 20,000 miles
  8. Squeaks or rattles from the cargo area that turn out to be suspension

On a 2020 Ford Transit with 150,000 fleet miles, the front struts sag under the constant load of delivery work, and the lower control arm bushings crack. The Transit also has a known issue with the steering intermediate shaft U-joint, which binds and causes stiff steering in one direction. On a 2019 Mercedes Sprinter, the front suspension has coil springs that sag over time, and the rear leaf spring bushings squeak.

Commercial vans also spend tens of thousands of miles idling and low-speed driving, which wears the power steering pump and hoses faster than highway miles. The ProMaster uses a hydraulic rack that leaks at the inner boots by 80,000 miles on high-mileage fleet vans. Front tire wear is accelerated because delivery vans stop and start constantly, scrubbing the tires at intersections.

How to inspect it

Safety note: Always set the parking brake and chock the wheels before getting under the vehicle. Use rated jack stands, never rely on a jack alone.

  • With the van empty on a lift, check the front struts for oil seepage around the body tube.
  • Measure the front ride height from the ground to the fender lip. Compare left vs right – more than half an inch difference means sagging springs.
  • Check the lower control arm bushings for cracks and separation, especially on Transit vans.
  • Inspect the steering intermediate shaft U-joint for stiffness by turning the steering wheel by hand while the van is off.
  • Look at the rack boots for swelling or fluid seepage, especially on ProMaster vans.
  • Check the front tire inner-edge wear pattern, which signals worn strut mounts or alignment issues.
  • Inspect the rear leaf spring bushings and shackles for rust and cracking on Sprinter vans.

Repair and replacement advice

  • Replace front struts as a pair on commercial vans; sagging springs on one side accelerate tire wear.
  • Lubricate the Transit intermediate shaft U-joint with white lithium grease to fix binding.
  • Rack leaks on ProMaster vans usually require a rebuilt rack, not a seal kit, because the inner housing is worn.
  • Align the van every 20,000 miles for fleet use; delivery wear burns through alignment in half the normal time.
  • Use heavy-duty sway bar links on vans that carry heavy roof racks or ladder racks.

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