[71K20chevy]

I keep hearing these LS motors are good for 300k (give or take)

My dad's got a 99 Silverado (5.3) with 250k, still original plugs and gets 19 mpg!


If you've got a 4L60E tranny, I can't see it living at much more than stock HP. My dad's truck I was talking about, has had the tranny rebuilt twice. First time was the sun shell (very common problem with 4L60's--beefed up replacements can be easily found), and the second time, the planetary was cracked.


That's the problem, the motors will handle anything you throw at them, but the transmissions in stock form are kind of weak!