i wanna learn how to madify a cummins and other diesels

My D350 was 2K
I had a 92 D250 I got for 3K, nice truck, auto tho, that sucked.
I also got a 95 2500 Cummins 4x4, for 2K, had a hole in the converter........

They are easy to find, you just have to act fast.