Parts for your 1999 Toyota Hiace-Gas struts

1999 Toyota HiAce Gas Struts

Based on technical sources, gas struts are used on the 1999 Toyota HiAce when the vehicle is fitted with the lift-up tailgate (back door). Toyota’s Electronic Parts Catalogue for the H100 HiAce (circa 1998–2004) lists “Stay, Back Door (RH/LH)” for tailgate-equipped variants, and the Toyota HiAce Body repair/service literature includes removal and installation steps for the back door stay. Models built with rear barn doors (swing-out double doors) are shown in the same catalogues without a back-door stay listing, confirming those variants do not use gas struts.

On a 1999 HiAce with a lift-up tailgate, the gas struts (back door stays) do the heavy lifting. They counterbalance the weight of the tailgate so it opens smoothly and stays put, even on a windy day at the beach or on the jobsite. That steady, controlled motion also saves the hinges and latch from a hammering, helping the back door last longer and feel easier to use day to day.

When the struts get tired, the van starts telling a story: the tailgate feels heavy, won’t stay up on cooler mornings, or drops suddenly in a gust — none of which is fun, and all of which is unsafe. Because both struts share the load, they’re best replaced as a pair. Using quality, HiAce-specific units with the correct Newton rating keeps the opening height and closing effort just right.

Servicing is straightforward. During routine maintenance, a quick check is worth it: open the tailgate fully, listen for creaks, and watch for any sag. Inspect the ball-stud mounts and brackets for play or corrosion. Keep the chrome rods clean — just a wipe with a dry cloth — and avoid silicone sprays, oil, or grease on the shafts, as that can damage the seals. If a strut shows oil misting, pitting on the rod, or reduced force, it’s time to swap them out.

Replacement is typically a 10–20 minute job with basic hand tools. Support the tailgate safely with a prop or a mate, pop the spring clips, and transfer the new struts on one side at a time. For roadworthy/WOF peace of mind in Australia and New Zealand, making sure the tailgate stays up securely is a simple win — and kinder on shoulders and backs, too.

• Signs they’re due: tailgate sags, uneven lift, clunks at full open, visible oil seepage.
• Best practice: replace in pairs, match OE length/force, check mounts, and torque fixings.

Does every 1999 Toyota HiAce have gas struts?

No — only those with the lift-up tailgate use gas struts. Vans built with rear barn doors (swing-out double doors) don’t need them, so they won’t be fitted.

How long should HiAce tailgate struts last?

Usage and climate matter, but many last 5–10 years. Frequent use, heat, or salt air can shorten that. If the tailgate won’t hold up reliably, replace them rather than waiting.

Can gas struts be re-gassed, or should they be replaced?

While some services offer re-gassing, replacement with new, correctly rated struts is the most reliable and time-efficient option for a HiAce. It’s inexpensive, quick, and restores full function.