What motor will fit in a 1998 ford f150 truck?

Many different motors could fit in a 1998 Ford F-150, depending on the original engine and the modifications you're willing to undertake. There's no single answer. To give you a helpful answer, I need more information:

* What engine did your truck originally have? (e.g., 4.2L V6, 4.6L V8, 5.4L V8) This is crucial because it dictates the available mounting points, wiring harnesses, and transmission compatibility.

* What are your goals? Are you looking for a direct replacement (same size and power), something more powerful, or a smaller, more fuel-efficient engine? This influences the engine options.

* What's your budget? A simple replacement will be significantly cheaper than a more powerful or fuel-efficient swap.

* What level of mechanical expertise do you have? A simple drop-in replacement is far easier than a significant engine swap requiring extensive modifications.

Once you provide this information, I can offer more specific and useful recommendations. For example, a direct replacement would simply be another engine of the same type as the original. But swapping in a completely different engine size or type is a much more complex project.