The torque wrench is a good thing to have around the shop. Many times, fasteners in sensitive areas will need to be tightened to a specific figure. The only way to do it, is to use a torque wrench. I'd suggest starting with a 3/8" model, and adding the 1/2" and 1/4" as necessary. Good torque wrenches are expensive. They are also somewhat delicate, and they need calibration periodically. If you are unwilling to deal with this, take your truck to a qualified mechanic when precise torquing adjustments are a required part of a repair.