The 3680, equipped with a Valmet engine, was replaced in 1990 by the 3690, which had 10 horsepower more than its predecessor, and at the same time, the 3670, equipped with a 6.6-liter Valmet engine (170 hp), was introduced alongside it. In 1992, the transmission was changed, like in the smaller models, to a four-speed Dynashift quick-shift type. In 1994, the engine of the 3690 was updated to the newer 634DS model.

Models based on the 3670 and 3690 included the Steyr 9155-9190, Valmet 8600/8800, and Landini 17500/19500.

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