Parts for your 1990 Mitsubishi Pajero-Bump stops

1990 Mitsubishi Pajero bump-stops: what they do and when to replace them

Bump-stops are absolutely fitted to the 1990 Mitsubishi Pajero. The factory service manual for late Gen 1 Pajero/Montero (circa 1989–1991, Suspension section) details front upper control arm bump-stops and rear axle bump-stops. The Mitsubishi ASA electronic parts catalogue also lists front “bump stopper” and rear “bump stopper” for L040-series Pajero models, and aftermarket catalogues from Haynes/Max Ellery’s/Gregory’s echo the same. So yes—bump-stops are relevant on this model.

On a 1990 Pajero, bump-stops act like compact, progressive cushions that prevent the suspension from smashing metal-on-metal at full compression. Up front, the double-wishbone torsion bar setup uses chassis-mounted rubber bump-stops that the upper arm lands on under hard hits, out back, the axle meets rubber stops on the frame (leaf- or coil-sprung variants both use them). They protect shocks, arms and spring mounts, tame bottom-out harshness on corrugations, and help keep tyres from fouling guards when the Pajero’s working hard off-road or with a load aboard.

As part of routine servicing, it’s smart to inspect all bump-stops. Look for cracks, splits, missing chunks, hardening, or oil swelling. If a stop is perished or missing, the vehicle can bottom out abruptly and chew through shocks or bend brackets. Also check the ride-height-to-bump-stop gap, if the front is sitting on the stops at rest, the torsion bars may be sagged or over-cranked. At the rear, frequent contact under light loads can hint at tired springs.

Replacement is straightforward: support the suspension/axle, unbolt the old rubber, clean the seat, and fit the new part with fresh hardware if required. Many owners replace in axle pairs to keep behaviour even. Rubber keeps NVH low and feels OEM, polyurethane can be tougher for heavy touring but may transmit a touch more harshness—choose based on use. After any lift or tyre size change, consider appropriately sized bump-stops to protect shocks and prevent tyre rub at full stuff.

• Service tip: inspect every 10,000–15,000 km or after harsh off-road trips.
• Red flags: harsh clunks on big hits, scalloped tyre inner guards, dented shock bodies, or visible stop damage.
• Good practice: verify ride height and alignment after front stop or torsion-bar work, follow FSM torque specs.

FAQs

What are the signs the Pajero’s bump-stops need replacing?
Common giveaways include sharp clunks over big bumps, visible cracks or missing chunks in the rubber, and evidence of metal-to-metal contact near the stop mounts. If the front upper arms are resting on the stops at normal ride height, the torsion bars or ride height need attention as well as the stops.

Are polyurethane bump-stops better than rubber on a 1990 Pajero?
Poly can handle repeated heavy compression and oils better, making it popular for touring rigs. Rubber stays quieter and more compliant around town. For heavy loads and rugged tracks, poly can be worthwhile, for mostly road use, quality rubber feels closest to factory.

Do bump-stops matter if the Pajero has a suspension lift?
Yes. With a lift, longer or correctly spaced bump-stops can protect extended-travel shocks from bottoming and stop tyres rubbing the guards at full compression. They’re a key part of setting safe up-travel on lifted Pajeros.