427.100 U 1000 was the only non-turbocharged 427 model. All wheel steering (Code C54) was only offered on the standard models of U1600 / U1650. Not on high output, or increased GVW versions.

The "L" in the model number in all Unimogs stands for longer frame. The additional length is all behind the rear axle. In the case of the two 1650's it's a 376mm difference. The "standard" or short frame models are designed to be used with a full range of rear implements and such as PTO's and three point hitches, backhoes, etc. The longer frame models are designed for installation of fixed bodies and are not available with Rear PTO's, three point hitches, nor suitable for heavy rear mounted implements. A lot of people assume the "L" is an abbreviation for LKW or Lorry? Nope, it simply is the first letter of "lang", the German word for long.

There is some variation in how MB used the designation. For instance instead of the model U1700 L/38, they had, for a time, a model called "U 1700 LL" meaning long frame and longer wheelbase. They finally standardized on the current convention of all "L" models are wheelbase of 3250mm except when designated with "/37, /38, etc.." (Of course they had to violate their own system when they built a few long wheelbase models with short frames.) Thus you have such as a "U2150 /38". Look Ma. No "L"

The 431 was based on the 421 series, and was produced in Argentina.

* The models marked with an asterisk are all "special project" vehicles and were never series production.

Notes: All engines are the Euro I, standard versions. Euro II engines were options after 1992. Engine numbers will be different.

Starting with the U1800 the engines were all turbocharged and charge air cooled (intercooler) . OM 366 LA engines start with the desigination 35X rather than 366. The 356.9XX is an engine meeting Euro I emissions standards. The 357.9XX model number designates and engine that complies with Euro II emissions