My truck is a 2005 ecsb LLY with the ZF6 manual transmission. The truck has 170k miles and was grandpa owned and very well maintained. I just recently noticed today a humming that only comes about in 4th gear it seems to be only for a portion of the rpm’s that I can make the noise stay. Say...
2005 GMC Sierra 2500hd diesel Duramax Engine with a 6 speed Manual transmission
Location: Northern California
One owner vehicle ( recently bought from original owner but I need an automatic, I am second owner)
Zero blowby no leaks
so i hopped in my truck and guess what, it wouldn't start. GrrRRrr batterys are good and fusses are good. i believe the starter is still good in the fact that it started 20 min earlier with no problems at all. i have narrowed it down to the clutch petal safety switch but i dont have anyway to...