Mitsubishi 4-cylinder models nor V6 models of the passenger Caravan, but were an option on the Mini Ram Van and Caravan C/V's long wheelbase models with a 3.0 L V6. V6 engines were only offered with the fully hydraulically operated TorqueFlite until the computer controlled Ultradrive 4-speed automatic became available in 1989. The Ultradrive offered much better fuel economy and responsiveness, particularly when paired with the inline-4 engine. However, it suffered from reliability problems, usually stemming from what is known as "gear hunt" or "shift busyness", resulting in premature wear of the internal clutches. It also required an uncommon type of automatic transmission fluid and is not clearly labeled as such, leading many owners to use the more common Dexron II rather than the specified "Mopar ATF+3", resulting in transmission damage and eventual failure. The Ultradrive received numerous design changes in subsequent model years to improve reliability, and many early model transmissions would eventually be retrofitted or replaced with the updated versions by dealers, under warranty. These efforts were mostly successful, and most first-generation Caravans eventually got an updated transmission. Trim The S-platform Dodge Caravan and Plymouth Voyager were both offered in three trim levels, an unnamed base trim level, mid-range SE, and top-range LE; LE-trim minivans were marketed with the option of simulated woodgrain paneling. In 1989, as part of a minor exterior update, Dodge and Plymouth each gained an additional trim level for the top of the model range, the Dodge Caravan ES and Plymouth Voyager LX, available only in standard-wheelbase configuration. The Chrysler Town & Country was only offered in a single unnamed trim level. Variants Cargo van Chrysler produced two cargo van variants of the S platform, both based upon the Dodge Caravan. From 1984 to 1988, Dodge marketed the Mini Ram Van. Distinguished by a "Ram" nameplate under the side-view mirror, the Mini Ram Van was renamed the Caravan C/V (Cargo Van) for 1989. In contrast to passenger vans, the Caravan C/V was fitted with model-specific headlight clusters, using dual sealed-beam headlamps (shared with the export Chrysler Voyager). Several window configurations were available, ranging from either no windows to a full set of windows. Coinciding with the 1987 introduction of the Grand Caravan, cargo van production expanded to both wheelbases. On the Caravan C/V, in addition to the liftgate rear door, Chrysler offered 50/50 split rear doors (similar to the Chevrolet Astro and traditional cargo