I have a 95 Blazer 4WD 4.3. My problem is that when I step on the Gas I hear the high revving, not from the engin but from the transmission. I put two quarts of tranny fluid it stoped and after like three weeks its doing it again. there's no leak so confussed on whats going on.

 

Get a transmission flush asap first. But sounds like that's only a bandaid for a bigger problem

 

It shifts good either way it just shift a little higher on the rpm before I add the tranny fluid

 

I had a whole reply all typed out but after reading your first post, I'm not exactly sure what's going wrong. Is your transmission struggling to shift into gears? Does the 4x4 HI and LO still work properly? Are you sure you're not being overly critical of the transmission operation? A little more detail will help.