Parts for your 1999 Toyota Crown-Gas struts

1999 Toyota Crown gas struts — what’s used and how to look after them

Based on technical references, gas struts are relevant to the 1999 Toyota Crown range, but fitment depends on body style. The Toyota Electronic Parts Catalogue (EPC) for the 170-series Crown identifies gas-charged damper stays on the Crown Estate (wagon) tailgate, while listing torsion bars for the sedan’s boot lid and a prop rod for the bonnet on many trims. Toyota Repair Manual sections for Body/Back Door procedures cover the Estate’s lift supports, and aftermarket catalogues such as Stabilus Lift-O-MAT and Monroe Max-Lift list tailgate gas springs for Crown Estate (1999–2003). Some higher-grade variants (including certain Majesta and Estate configurations) are noted with bonnet gas struts in parts listings, but the mainstream sedan typically does not use gas struts on the boot or bonnet.

For vehicles fitted with gas struts (notably the 1999 Crown Estate tailgate and any bonnet-equipped variants), these little nitrogen-charged rams do the heavy lifting. They keep the tailgate or bonnet gliding up smoothly and staying put overhead, which is all about safety and ease of use. Over time, seals harden and gas pressure tails off, so lift slows, the panel sags, and there’s more to wrestle with on a cold morning. As part of regular servicing, a quick check each service or yearly is smart: open the tailgate/bonnet and confirm it reaches full height without help and stays there solidly, with no creaks or shudders.

• Tell-tales of tired struts: slow lift, needing a hand to start moving, dropping in cold weather, or any oily film on the rod.
• Replace in pairs so opening forces stay balanced and latches align properly.
• Match length, end fittings, and force rating to the specific Crown variant, the Estate tailgate uses a different spec to any bonnet strut.
• Support the panel with a prop before removal, these are pressurised—don’t heat, puncture, or crush them.
• Lightly clean rods with a soft cloth, avoid grease on the rod itself (it attracts grit), but a touch of suitable lube on ball joints is fine.

With the right parts, swapping them out is typically a 15–30 minute job per pair using basic hand tools. Genuine or quality aftermarket replacements from reputable suppliers will restore proper lift and hold, save the hinges and latches from extra stress, and make day-to-day use feel new again. If the car is a 170-series sedan whose boot uses torsion bars, strut replacement won’t apply—any boot-lid issues there call for torsion bar adjustment or replacement instead.

Technical sources referenced: Toyota Electronic Parts Catalogue (170-series Crown, model codes including JZS171W/UZS171W) – Body/Back Door sections, Toyota Repair Manual – Body Mechanical, Back Door and Hood procedures for Crown (1999–2003), Stabilus Lift-O-MAT and Monroe Max-Lift application catalogues for Crown Estate tailgate gas springs.

Popular questions

How can someone tell their 1999 Crown’s gas struts are failing?
Common signs include a tailgate or bonnet that won’t reach full height without a shove, sags back down slowly, or drops faster in colder weather. Any oily mist on the strut body or rod is a giveaway that the internal seal is leaking. Noises like clicking or binding at mid-stroke also suggest wear in the joints or rod.

A quick test is to open the panel and leave it up for a minute. If it creeps down or feels “light” to hold up, it’s time to replace the pair.

Should gas struts be replaced in pairs on a Crown Estate?
Yes. Replacing in pairs keeps lift force and geometry balanced, preventing one side from overloading hinges or twisting the tailgate. It also helps the latch meet the striker squarely, reducing slam force and avoiding early wear.

What gas struts fit the 1999 Crown—are sedan and Estate the same?
No. The 170-series Crown Estate tailgate uses dedicated lift supports with specific length, end fittings, and force, while the sedan typically runs a torsion-bar boot and often a prop-rod bonnet. Some higher trims may have bonnet struts, but they’re different to the Estate’s tailgate units. Checking the EPC by VIN or matching the markings on the old struts is the safest way to get the right parts.