Parts for your 1999 Daihatsu Gran move-Gas struts

1999 Daihatsu Gran Move gas struts – what they do and when to replace them

Gas struts are indeed fitted to the 1999 Daihatsu Gran Move (also known as the Pyzar) for the rear tailgate. This is confirmed in the Daihatsu Electronic Parts Catalogue for the G3‑series Pyzar/Gran Move (1996–2002), which lists “Stay, Back Door” gas‑charged supports, left and right, in Body group 68. The factory Workshop Manual (Body section: Back Door—Stay) also details removal and installation of these tailgate struts. The bonnet on this model is supported by a manual prop rod rather than gas struts, which is typical for small Daihatsus of the era.

On this five‑door, the tailgate gas struts take the weight of the hatch, lift it smoothly, and hold it safely open. When they lose pressure with age, the hatch can become heavy, rise slowly, or drop unexpectedly—annoying on a good day and dangerous on a windy one. Because they work as a pair, it’s best practice to replace both at the same time so the load is balanced and the hinge geometry isn’t stressed.

Servicing is straightforward. Support the open tailgate securely with a prop or a mate’s help. Pop off the retaining clips at each end of the old strut, ease it off the ball studs, then clip the new unit on—rod end down on most designs. Check the ball studs and brackets for play or cracks and replace if worn. Don’t grease the shiny piston rod, just keep it clean. A tiny dab of light oil on the ball joints is fine, but avoid anything that attracts grit.

Owners should keep an eye out for common signs that the Gran Move’s gas struts are due:

• Tailgate sags, won’t stay up, or drops in cold weather
• Struts feel weak, lift is slow or uneven, or there’s a hiss with oil mist
• Visible scoring, rust, or bent rods

Quality aftermarket replacements matched to the original length, end fittings, and force rating will bring the hatch back to easy, one‑handed operation. Replacing in pairs every decade or so—or sooner if symptoms show—keeps the tailgate safe and the interior trim, hinges and latch happier in the long run.

Popular questions about 1999 Daihatsu Gran Move gas struts

How long do the tailgate gas struts usually last?
In local conditions, many Gran Move tailgate struts last 8–12 years. Heat, constant sun, and dust can shorten that. If the hatch doesn’t hold up confidently—especially when it’s cold—it’s time to replace both.

Can just one gas strut be replaced?
It’s technically possible, but not recommended. Uneven force can twist the hinges and make the hatch open or close awkwardly. Replacing both together keeps things balanced and protects the tailgate hardware.

What specs should be matched when buying replacements?
Match three things: extended/compressed length, end fittings (ball socket size/angle), and force rating. The correct force ensures the hatch lifts crisply without slamming shut or springing up too hard.