Editing Unimog (section)

=== 1970s ===
==== 1972 – MB Trac ====
{{Main|MB Trac}}
[[File:MB-trac 443.166 JM 2023 08 12 5D410155.jpg|thumb|The [[MB-trac]] range of [[agricultural tractor]]s produced from 1973 until 1991 by Daimler-Benz is based on the trac design principle and shares the Unimog's drivetrain. Pictured, 1600 turbo.]]

Despite originally being designed as an agricultural vehicle, the Unimog had more success as a multi-purpose tool carrier. To actually serve the agricultural market, Daimler-Benz designed a completely new agricultural tractor in 1972, the [[MB Trac]]. It is a body-on-frame design ''trac''-tractor, has four big wheels of the same size, and all-wheel-drive, a slim bonnet, and an angular driver cab. In contrast to conventional tractors the cab is situated between the axles, similar to comparable four-wheel-drive tractors. There is no articulation between the front and rear sections, instead, the MB Trac has conventional steering.

A wide range of MB Trac tractors were offered, ranging from the entry model MB-trac 65 to the top model MB Trac 1800 intercooler. Daimler-Benz later merged the MB-trac with the agricultural machinery activities of [[Deutz AG]]. The manufacturing of the MB Trac series ceased in 1991.

==== 1974 – Heavy series ====
{{Main article|Unimog 425}}
In 1974, Mercedes-Benz presented the new Unimog U 120. It was the first model of the "heavy duty" Unimog series 425. The heavy duty series, or simply "heavy" series, extended the Unimog model lineup. The characteristic "edgy" bonnet introduced with the heavy Unimog series remains a Unimog style element to this day.

The series 425 have a {{Convert|2810|mm|in|abbr=on}} wheelbase, 9&nbsp;t permissible maximum mass and an OM 352 Diesel engine producing {{Convert|120|PS|kW hp|abbr=on}} (shortly thereafter {{Convert|125|PS|kW hp|abbr=on}} as U 125).

==== 1975 – Series 435 ====
{{Main|Unimog 435}}
Manufacture of the series 435 for the [[Bundeswehr]] began in 1975, as a successor of the Unimog S&nbsp;404. The 435 was characterized by a long wheelbase of {{Convert|3250|mm|in|0|abbr=on}}, {{Convert|3700|mm|in|0|abbr=on}} or {{Convert|3850|mm|in|0|abbr=on}} and shares its cab with the series 425.

==== 1976 – Unimog models renamed ====
[[File:Unimog U1300.jpg|thumb|right|Unimog U 1300 municipal truck in [[Rēzekne]], [[Latvia]]]]
The new 424 "middle" series of Unimogs was produced starting from 1976. They share the cab with the series-425 and are designated U 1000, U 1300/L, U 1500, and U 1700/L with {{Convert|124|kW|hp PS|0|abbr=on}} engine performance.

In the same period Daimler-Benz re-ordered the type designations for the older series. The classical round form series of the Unimog were now designated U 600/L, U 800/L, U 900 and U 1100/L. (The letter L stands for a long wheelbase, because most models were available in two wheelbase variants.)

The Unimog with the rounded driving cab became known as the ''light'' series. The new series with angular cab was divided by payload into a ''middle'' and ''heavy'' series. Some engines overlap – the Unimog nomenclature is not simple to understand (see below for notes on series names).

The long-proven Unimog-S (404), although with clearly decreasing production figures, was the only Unimog with an Otto cycle engine in the lineup.

With the exception of the entry-level model, all Unimogs for 1976 were equipped with four wheel [[disc brakes]].

==== 1977 – 200,000th Unimog ====
The 200,000th Unimog, a 424.121, was produced in 1977.<ref name="Unimog 1976 bis 1985" />