John, I had an 02 avalanche 3/4 ton with an 8.1 and a allison. I loved that truck. The only reason I sold it was because I got into a 5th wheel trailer. I drive a ram/cummins now and I love it! Here's my questions for you.....1. I would assume that your truck is payed for or almost paid for? 2 If your happy with how your truck tows, why get out of it? 3. Why don't you tell your friends if they want you to have a new diesel, have them buy it for you. I hate to agree with Cole but if it ain't broke, don't fix it!!!!