My transmission seems to be "hunting" between 1st & 2nd. When taking off from a standing start, my trans seems to be slipping and trying to go into 2nd but takes a long time to do it. Other shift changes fine 2-3, 3-4. Most noticeable on hot days. Fluid changes regularly and level is okay. 92,000 miles. 4R100
Any thoughts?

Thanks,

John