I'm assuming you mean the WISC-IV, since Pearson told my secretary a few days ago that they had not started shipping the WISC-V yet. (I thought mine had arrived, but it wasn't in the shipping.)
140 on the SBV and 138 GAI on the WISC-IV are not significantly different. Keep in mind that there is no measure of processing speed on the SBV. His WJIII achievement scores are also quite consistent. So from a global perspective, I wouldn't see any reason to question the validity of the results, nor to be overly concerned about academic progress. I would agree that the place to look would be the fluency measures on the WJIII. If they are equally low, then I would be more concerned. If they are at least high average (110+), I would be less concerned.
Do you observe any behaviors in school or at home that would be consistent with slow processing speed, visual/fine-motor weaknesses, or impaired automaticity?
