trans problem,,,

need help, trans not wanting to take of in low..does not slip & pulls good but,still wants to take off in high.is there a senser i should know about that will cause this?

Year - Engine - Model ?? Do you know which transmission you have?

If it is 93 or newer, you should have it scanned with a trans capable scanner to see if any codes are present.

//2000CAYukon