In the 1998 model update, the Fastrac 155 and 185 were renumbered as the 3155 and 3185. The bodywork was more rounded than before, the cab was improved, and the drive axles were strengthened. The fuel tank was also enlarged. New to the transmission was a three-speed quick-shift range, whose Autoshift function could be programmed with five different modes. A direction shuttle became standard equipment, although it still required confirmation via the clutch pedal (or later by a button at the end of the stalk). The larger models had a top speed of 65 / 80 km/h. The tire sizes given apply to the 65 km/h variant.

The engines remained unchanged: a Perkins unit in the 3155 and a Cummins in the 3185. Power outputs were still offered in two ratings: 150 / 168 hp and 170 / 188 hp.

For 2003, JCB introduced the new, futuristically styled Fastrac 3190 and 3220, both powered by Cummins 24-valve engines.

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