My daughter has a '90 4Runner with the 22RE and 5 speed, great truck. She put 31" tires on it against my instruction and that kind of killed the power and mileage but it's still a great truck. It has 4.11's, they really need 4.56's for 31" tires and 4.88's for 33" tires.
In Toyota Land the 3.0 or "3.Slow" is a known turd. Toyota did head gasket replacement under recall/warranty but that's probably ended. Lots have wiring issues too I seem to recall, but can't quote specifics.
3.4 is way better, but watch for cracks around the balancer keyway, that part is expensive. 3.4 started in '96 in the Runner I believe.
Buy your parts from Rock auto, they're quite often the best price, sometimes by a lot.
