Quote Originally Posted by BushMasterBoy View Post
If you buy a Colorado, PUT A GIANT TRANSMISSION COOLER ON IT. Always a weak weak point for GM transmissions. I also added a deep ventilated transmission fluid pan. Pan comes with a drain plug. Don't buy the owners manual saying the fluid is good @ 100,000 change interval. Change it at 30,000...

PS I have a Colorado.
What year, engine and current mileage?