Holden Trimatic Identification _top_ Jun 2026

The definitive way to identify a Trimatic is via the red metal identification tag riveted to the side of the transmission case (passenger side, near the pan). This tag contains a two-letter or three-letter code that determines the "calibration" or valve body differences.

The most immediate way to identify a Trimatic is by its physical profile: holden trimatic identification

Place a straight edge across the bellhousing face. Measure the distance between the top two bolt holes. For a red 6, it is approximately 85mm. For a V8, it is approximately 115mm. The definitive way to identify a Trimatic is

For the better part of three decades, the (officially designated the "Tri-Matic") was the workhorse automatic transmission for General Motors’ Holden division in Australia. Found in everything from the humble Torana to the stately Kingswood, the one-tonne Bedford van, and even early Commodores, the Trimatic is a beloved—and sometimes maligned—piece of Australian motoring history. Measure the distance between the top two bolt holes