Having what I believe to be Transmission problems. I have a 2005 QC with 48RE Transmission. No major mods just a CAI and Borla Catback. Noticed an issue driving it a day after washing it. Not sure if washing it has anything to do with the cause just thought I would mention it. I did use a pressure washer to spray off the hood scoop screen. I was driving it and the transmission would randomly down shift and shift back. Got it home, didn't think anything of it then went on vacation. Came back drove it again and with light throttle application it would down shift seek the next gear and not shift out of gear until I let off the gas. I had to baby it all the way home. Under 2500 RPMs. I did a little research and think I might have it narrowed down to the transmission pressure governor and pressure sensor transducer. I did a little research and it seems that this is a common problem. There's even a TSB for the 48RE to replace the transmission pressure governor. I plan on replacing those parts but I figured I'd throw a line out and see what comes back before I spend money.
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