Short rundown of the NADM Diesel Truck Puling Classes as found here on their site.

National Association of Diesel Motorsports


NADM presents a wide range of classes in Diesel Sled Pulling, with a rule set permitting every level of Diesel truck, 2 and 4wheel drive, from stock street trucks to full blown tube-frame Modified pulling trucks. NADM is also offering a points class for Hot Street Semis for 2010.

See class overviews below:

Work Stock: Stock appearing turbochargers, 1" minimum compression travel on rear suspension, water injection prohibited,, hanging weights prohibited.

2.6 Street Diesel: Single turbo, 2.6 inch maximum inducer bore, turbocharger bushings prohibited, water injection prohibited, bolt in, removable solid rear suspension bars permitted, receiver style hitch required, hanging weights permitted.

2.8 Street Diesel: Single turbo, 2.8 inch maximum inducer bore, turbocharger bushings permitted, water injection prohibited, bolt in, removable solid rear suspension bars permitted, receiver style hitch required, drive shaft u-joint shields required, hanging weights permitted.

Super Street Diesel: Unlimitied Single Turbos, 3.2-inch max turbo in twin configuration permitted, open driveline permitted, DOT tires required.

Modified Diesel: Unlimited turbocharger, open driveline, open tire, 7600 pound maximum weight.

Street Legal Semis: Road ready, street licensed semis.

See NADM rulebook for specific class guidelines.