A friend of mine has a 2000 ZR2 Blazer.... he has code B2725 coming up and feels the auto 4x4 is not disengaging when placed in 2hi... has a shake in the front ... that was not normally there.... when at 70 miles per hour... if this belongs in a different topic... please move....

 

Here is what GM says ...Unfortunately a Tech 2 scanner is required for the diagnostic chart.