89 was the first year of the 5th generation. It would have come with a 2.4 L 22RE I4 or a 3.0 L 3VZ-E V6. At that time the US had outlawed asbestos head gaskets. Toyota did not get the head bolt torque right with the new gasket material on the 3.0 so they had a lot of head gasket failures after 100,000 miles. The exception was 88 and some 89 3.0's that had different head gaskets and did not have the problem. That being said the 3.0 was not a bad engine,It just did not have that much more power and torque than thelighter 22RE. The 3.0 got horrible gas mileage and was slow especially with the automatic transmission. The 3.4 is the popular swap when your 3.0 dies. The 3.4 is a good engine and makes 40 to 50 HP more than the 3.0. In 91 I bought a 4x4 X-Cab with 5spd then in 94 SR5 X-cab with auto. The 94 was slow,thirsty, and It would barely pull my boat out of the water. 12,000 miles later I solved that problem with the new 97 F150. Fortunately I sold both my 3.0's long before they got to 100,000 miles.