If your 89 is a V6 I would not reccomend using a 4cyl automatic transmission, being that you have to swap bellhousings. That, and my Montero had a 4cyl trans swapped into it and it overheated constantly and eventually burnt the pump up. And if your getting 21mpg I wouldn't dare exchange that transmission since its obviously dipped in gold and lined with diamonds (my modded v6 auto Raider gets 13mpg). <img src="/forums/images/graemlins/lol.gif" alt="" />

Richard E
1989 Montero - Stock-ish
1989 V6 Auto Raider - 5.3 Vortech Swap.
1987 Mitsubishi Starion 2.6t, soon to be 3.5
1983 Honda XL600R