I installed a Flex a lite 180 that I bought from Summit. It is rated at 3300cfm and I love it.

On the last summer with the A/C on and while driving up steep hills at highway speeds the temp gauge barely went over half (pretty close to where it is on cold days.

The engine warms up a lot faster on sub freezing mornings and I have extra power.

To install this larger fan I had to take a hole saw and cut a half circle for the driver side radiator hose and pasenger side petcock valve.

I LOVE IT!

89 Ext cab 22RE 5 speed
84 Ext cab 22R 5 speed
88 Mitsubishi Macro Cab 2.6 5 speed