A 4BT is huge and expensive and seriously powerful. It's also an expensive pain in the ass to install, what with needing a springover for a good ride, adapter plates, NV4500 tranny, and on and on. On top of the expense, I wouldn't be able to register my truck -- installing that engine is against federal EPA emissions regulations, since it never came in a 1/2-ton pickup or smaller.
Here's the deal on emissions. When you do an engine swap, you must use an engine from a vehicle [highlight]your year or newer[/highlight], in [highlight]your weight class or lower[/highlight]. The FJ60 (and presumably FJ40) is in the 1/2-ton pickup weight class, so we can only use a motor that came in a 1/2-ton pickup, compact pickup, or passenger car.
The other important EPA rule to note is that you have to use [highlight]all the pollution-control and engine-control equipment[/highlight] that came on the donor vehicle. Catalytic converter, speed sensors, EGR, the whole shooting match.
If you don't follow the EPA rules, you can't get the official certificate from the smog police that lets you get your emissions test. No emissions test, no license plates. In my county (Larimer, Colorado) all diesel vehicles must be emissions tested once a year. Gasoline vehicles get tested every two years.
Fun stuff, huh?
Alex
