Suspension & Air Springs | A-One Truck Auto

Parts in this category

Firestone

Ride hardware focus

Air bellows and heavy-duty dampers for Class 8 air-ride — not cabin HVAC filters parked in the wrong category.

Four suspension parts are listed above; each card shows its price in U.S. dollars.

Shop notes

Air springs and shocks keep the frame off the stops and the cab from beating the driver. This department lists Firestone W01-358-9781 and Goodyear-style 1R14 air bags plus Monroe Magnum and Gabriel Fleetline shocks for Class 8 air-ride tractors and vocational chassis.

Read the bellow for dry rot, check the air stud thread, and compare the piston diameter before you order. Bags sold as 9781 or 1R14 still vary by bead plate and bracket. Shocks that drip or that no longer resist hand compression belong in pairs on an axle when the mate is equally tired.

Install with the axle supported, inflate slowly, and torque clamps to the suspension maker chart — not to “good and tight.” After install, watch ride height valves so the bag does not overstroke. Search W01-358-9781 from the hero field when that stamp is on the old bag.

Bags versus dampers

Air springs are selected by bellows style, bead plate, and air-port location; shocks are selected by compressed length, extended length, and mount type.

A bag with correct diameter but wrong port clocking will rub a bracket even if it looks fine from ten feet away.

Cab and tractor ride shocks are not interchangeable with trailer dampers — read the fitment rows on the linked product page.

Inspect bellows for cracks, dry rot, and rub marks; check shocks for oil wetness along the body.
Verify ride height and linkage before condemning a new bag that will not settle.
After install, soap-check fittings and watch clearance through full dump and lift.
Need a second opinion on plate bolt pattern? Email support@aonetruckauto.com with photos of the removed bag or shock.

Removed-part checklist

Measure plate bolt circle and port thread on the old bellow before trusting a cross number alone.

Pair shock replacement on an axle when both units show equal fade — one new damper on a tired mate skews tire wear.

Keep the old bag or shock body until the truck completes a loaded test loop.

Where these ride parts land

Firestone and Goodyear-style bags here serve common Class 8 air-ride tractor and trailer positions; Monroe and Gabriel shocks cover Magnum and Fleetline-style vocational and highway mounts.

Published make chips are starting hints; SKU pages list the concrete make, model, year, and engine rows we maintain for each part.

PM walk and torque discipline

Walk the suspension at each PM and after dock impacts. Air leaks and dead shocks appear as tire wear and driver complaints before they strand the truck.

Technical articles on this site explain common air-ride vocabulary; suspension OEM charts govern clamp torque and ride height setup. See shipping policy and returns and refunds for order handling.

Crosses and catalog operator

Bag crosses abound; measure plate bolts and port thread before you trust a catalog line alone.

HEAVY TRUCK PARTS, INC. operates A-One Truck Auto. Names on this page describe compatibility, not factory affiliation.

Suspension SKU notes

Per-part pointers below; pricing remains on the product cards only.

Firestone W01-358-9781 is a rolling-lobe air spring for tractor and trailer air-ride positions — fitment and PayPal checkout on Firestone Air Spring W01-358-9781.

Goodyear-style 1R14-039 covers another common Class 8 air bag footprint; confirm bead plate on Goodyear Air Spring 1R14-039.

Monroe 65116 is a Magnum heavy-duty shock for cab and chassis damping — see stroke and mounts at Monroe Magnum HD Shock Absorber 65116.

Gabriel 85006 is a Fleetline HD shock for tractor suspensions when Gabriel is on the shop standard — order from Gabriel Fleetline HD Shock Absorber 85006.

These four SKUs are the published Suspension and Air Springs assortment for this catalog.

Air-ride comfort protects cargo and driver retention. A bag that leans the tractor or a shock that has lost its oil shows up as feathered tires and write-ups long before a roadside event.

Aftermarket bags must clear heat shields and brackets through the full dump cycle. If the bellow kisses a clamp at dump, relocate hardware or choose a different plate style.

Torque corroded hanger bolts with care — rounded heads turn a one-hour bag job into a torch project.

Height control linkage

Ride height valves translate frame position into air pressure at the bellows. A bag that looks soft may be a linkage rod knocked out of adjustment after a dock hit — replace the bag only after the valve follows the arm through its full travel.

Trailer bags and tractor bags share part number families but not always the same bead height. Photograph the old unit on the ground with a tape measure across the plate bolts before ordering from memory.

Shock pairing logic

Monroe 65116 and Gabriel 85006 compete for similar mount categories; choose the brand your fleet already stocks to keep warranty paperwork simple.

Heat from exhaust wraps can cook shock oil on some vocational routes. If one side of an axle shows blistered paint on the shock body, inspect routing before installing identical part numbers again.

Firestone W01-358-9781 and Goodyear 1R14-039 both appear on PM spreadsheets — standardize on one manufacturer per fleet when possible so height valves stay tuned to consistent spring rate.