The Mercedes Benz 300e, a model celebrated for its engineering and performance, often sparks questions regarding its automatic transmission systems. Specifically, confusion arises around whether certain models start in first or second gear. This article aims to clarify the variations in transmissions equipped in the 300E, focusing on the 722.320 and 722.358 models.
Understanding Mercedes Benz 300E Transmissions: 722.320 vs. 722.358
During the production run of the Mercedes Benz 300E, two primary transmissions were utilized: the 722.320 and the 722.358. The earlier models of the 300E were typically fitted with the 722.320 transmission. A key characteristic of this transmission is its second gear start. For everyday driving conditions, the vehicle would begin moving in second gear, shifting to higher gears as speed increased.
However, Mercedes Benz introduced the 722.358 transmission in mid-1989 as an upgrade for the 300E. This updated transmission incorporated several improvements over its predecessor, including a significant change: first gear start. Unlike the 722.320, the 722.358 allowed the Mercedes Benz 300E to launch in first gear, providing enhanced acceleration from a standstill.
The Overlap and Confusion: Model Years 1989-1991
The source of confusion for many Mercedes Benz 300E owners and enthusiasts lies in the overlapping period of usage for these two transmissions. From 1989 through 1991, the 300E models could have been equipped with either the 722.320 or the 722.358 transmission. This means that two 1991 Mercedes Benz 300E cars could have different starting gears depending on which transmission was installed at the factory. The 722.320 was eventually phased out in 1991, while the 722.358 continued until early 1993 when the 24-valve engine variant of the 300E was introduced.
Factors Influencing Transmission Choice (Speculation)
While the exact criteria for choosing between the 722.320 and 722.358 transmissions during the overlap years are not definitively known, it’s speculated that rear axle ratios may have played a role. It’s plausible that the 722.358 with first gear start was paired with 300E models that had lower numerical rear axle ratios, while the 722.320 with second gear start might have been matched with cars having higher numerical ratios. This is, however, a hypothesis and requires further investigation to confirm.
Other Transmissions for Mercedes Benz 300E
It’s also important to note that the Mercedes Benz 300E range included other transmission variants depending on the engine type and model year. The 300E 2.6, for instance, was equipped with the 722.4 series transmission, different from both the 722.320 and 722.358. Furthermore, the 1993 Mercedes Benz 300E models featuring the 24-valve engine utilized yet another transmission, the 722.369.
Conclusion
Understanding the transmission variations in the Mercedes Benz 300E, particularly the difference between the 722.320 and 722.358, is crucial for owners and those considering a transmission swap or repair. Recognizing that 1989-1991 models could have either transmission helps explain the differing experiences related to starting gear. While the mystery of the exact selection criteria remains somewhat speculative, this guide offers a clearer picture of the transmission landscape for the iconic Mercedes Benz 300E.
