I also just added Dr Tranny Shudder Fix AND a bottle of Lubegard and the shudder is completely gone. I'm at 81k miles and will do a transmission fluid change soon. The fluid in there now looked good though.
Are you talking about the Suburban 2500/Yukon XL 2500 or just in general 3/4 ton trucks with gas motors? Cause you mentioned Ford and Sierra, but we're in a Tahoe/Suburban/Yukon forum. Some clarification could help drive the discussion better.
I also just bought a 20013 Denali with 79k miles on it and it does this exact thing you describe. I'm wondering if it's the V4 to V8 AFM garbage. I'm planning to get that tuned out with a Blackbear tune, but until then it's going ot drive me crazy. Doesn't do it when I put it in tow mode...
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