It's the season of the Peterbilt 359 here in Spring ... Well, the 3406 mechanicals do a good bit better. Troy Bolin: When that B model Caterpillar come out, it did so much better, run better ...

Jason Williams has owned this 1983 Peterbilt 359 for nine years ... The only things he's left unchanged are the engine block of the 400-hp Cat 3406B, the cab and the steer axle.

Caterpillar's ACERT-technology engines -- the company's solution for complying with stricter Environmental Protection Agency emission regulations -- are now available for order in Peterbilt trucks ...