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Over 100k Mile Maintenance

cntry_boy77

Full Member
Joined
Jan 20, 2015
Messages
21
Location
MI
2003 Avy 2500, I've had it almost 2 yrs. It has just under 140k miles on it. Not sure if the PO did any maintenance to the truck. I'm thinking plugs and wires, trans fluid change (should I have it flushed as well?). Anything else I should look at, diff oil changes, transfer case, etc? I want to ready it for the towing season which brings a few more ?s, it seems to struggle with freeway driving and pulling decent hills. Anything I should look into for helping it perform better in these areas?
 
Owners Manual has lots of good maintenance scheduling info.
We have PDF copies in our Resource section

Good Luck and Welcome
 
Change tranny fluid and filter but don't flush.

I'd replace the front O2 sensors and the air filter.
 
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