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  1. W

    Hard / Delayed shift issues

    Josh pulled the transmission and rebuilt the C3 clutch assembly. He said the C3 piston seal were hard and not sealing properly and allowing the fluid to go between the piston and bore. All other clutches were in good shape. I also opted for the Mike L spring upgrade and a Trans-go shift kit...
  2. W

    Hard / Delayed shift issues

    Big shout out and Thank You to Mike L for taking the time to talk to me about my transmission issues and for the recommendation of Josh H at Top Notch Garage. Josh/Top Notch Garage, thank you for listening to me about the transmission issues and for giving me options for repair that met my...
  3. W

    Hard / Delayed shift issues

    Thanks for the suggestions. I'm going to see Josh
  4. W

    Hard / Delayed shift issues

    About 2 weeks ago I did routine maintenance to my 2002 Duramax (100% original stock, no upgrades or controllers ever) including drain & fill transmission fluid and changed spin-on filter. About a day and a half later I started getting delayed & hard upshifts. I drove for another day until the...