Jasper motor rebuilders supplied me a rebuilt 5.9 Cummins motor for my 2007 Dodge Ram. After installation it lasted less than 4000 miles before it blew up. Fortunately it came with a warranty and they provided another motor, but didn't cover all the cost of labor. I had to pay $1550 out of pocket. That motor lasted about 800 miles and blew up just like the first one. And you guessed it, they only covered half the cost of labor. The next (currently #3) motor has less than 500 miles on it and I'm only going to drive it until I get the oil changed and sell it. My friends are saying my truck is cursed, but we all know where the blame falls. I know what you're thinking, "he must drive it like it's a race car". No, I drove it just like I've driven all my vehicles my entire life. I have another truck with an identical engine that has almost 300,000 miles on it and it's as strong as ever. You normally can't kill 5.9 Cummins.
Jasper motors is a crappy engine rebuilder! They have no quality control or integrity. I wonder if they just pulled a bunch of near broken parts out of a dumpster and threw together a runner and shipped it. They had a good reputation 3 or 4 years ago, but if you look online now all you find is how everything they rebuild is garbage. I was hoping to win the lottery during this last go around so I could buy the company, fire everyone, and sell off all the assets just out of spite.
DON'T buy anything from Jasper! DON'T buy anything from Jasper! Don't buy anything from Jasper!