If you love the truck and it is paid for. You have a new engine, transmission itself should go for another 80,000K miles or more. You are going through the rear axle. About the only driveline parts left are the fuel pump, transfer case and the front axle. If the frame/body and such are holding up okay I would probably clean up the rust, spray all the metal underneath with wax-oyl or fluid film, and run it. I own an 2002 Blazer which is basically the same vehicle with an SUV body and It has over 200,000 miles on it. Other than a fuel pump, injection spider, transmission and front wheel bearings it is original GM. I plan on going over it this summer and running it at least another 100,000 miles. I really wish GM had not dropped them from the US line-up. The replacements just do not match up.
Tuesday, December 13th, 2016 AT 11:43 PM