Really depends on how you use the truck. If your a higher RPM, quick shifter type, the tranny will not last very long. If you try to tow things it won't last, & if you start to loose fluid because of the rubber plugs, & don't notice it, or let it go, it will die. Adding more performance parts to increase power , or big tires will also lead to early failure. My truck only had 65K miles before my 5 speed went. But I also towed stuff, including a 2500lbs fishing boat.