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GOt it figured out, The servo was acting up and we upped the line pressures a tad and all is well.

So here is the rundown : 04 2wd silverado 5.3 4l60-E 126k miles. Stock motor and tune Just had the trans rebuilt and new convertor (5 miles) No hard driving or over 3000rpm yet. Proper install and fluid fill was done as well as cooler and line flush to remove contaminates. So on...