I looked at a 2wd 1990 suburban today with a tbi454. It ran very nicely with 178,000 miles. He said it has an "RV package" Anyone know about this? It's supposedly sporting heavier duty brakes. Interesting of note, it does have a th400 which the brochure lists that year as an "optional" 4speed auto. I think I'm going to buy it. Comments anyone? The rear axle is 10.5"