Some times it is fine and works well but if we can hear the transmission we know it will be shifting rough and mostly at road speeds Put lucas treatment in after removing some fluid(dirty looking). no change
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Sounds similar to my Sable.. I was told that it is the power steering pump making the whine and that if I couldn't stand it, I'd have to have it changed.. Other than the whine, it works just fine.. SO, it's whined for about 10 years, now..
I think your gearbox oil is probably a slight bit thin. As the oil warms it gets thinner so It might be ok cold but one warm be to thin. A common practise with hard shift all the time is to thin the oil with ATF maybe this has been done with yours but thinned out to much. Either way you should check the level, color & texture of the oil & if not appear right replace it.
on the older style blazers the fan clutches did fail and would often be misdiagnosed as shifting problems as the clutch engaged and disengaged.... also a hard 1-2 shift can be due to your vehicle storing a transmission fault code in the ecm... some transmission fault codes will put the transmission into a fail safe or limp mode in which it engages high line pressure .... this can cause your hard 1-2 shift and will feel normal most of the time other than that. high mileage on the transmission fluid may also require it to be flushed and have the filter kit replaced