Driver side of the engine just as you look down you'll see the power steering pump and reservoir, take the cap off and it should have the stick on underside of the cap. if that's ok, check idler arm(s), tie rods, ball joints, grease zirts, n e thing else that has to do with front tires and steering. Hopefully this helps u out a lil bit!
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If it had lots of miles on the trans fluid befor you changed it that fluids additives broke down long ago and wore out most of the fiber material in your trans,,its a problem with alot of gm makes ,unfortunatly you now need to rebuild at least a portion of the trans
Chevy blazers dont have timing belts they have chains. The chains get noisey on some engines that are run hard or the oil changes are missed. Sometimes these engines live their whole life if not run too hard without changing the chain. Noise lower gas mileage uneven idel hesate to accerate. These are all things that happen over 100 thou miles. Many go way farther with no problems
A fluid leak that is pink and/or red colored is usually either power steering fluid or transmission fluid. I recommend checking both. You can check the power steering fluid when the car is off. However, the transmission fluid should be checked with the engine warm and idling in neutral. Have someone else step on the brake or use the parking brake and block the wheels while you're measuring the transmission fluid level.
Your going to have to get the ECM scanned, Auto Zone scan's for free and most garage now will scan for $10.00 to $15.00 since they all have the scanners now and need the business.
You could have a Vehicle Velocity Sensor (V V S) going bad or the wire harness it self. The V.V.S tells the ECM how fast the drive shaft is rotating and calculate's what gear it should be in relative with the engine speed and throttle position, and transmission fluid pressure.
Regardless you need the Blazer scanned to pin point why your transmission is shifting the way it is. Could be as simple as time for transmission oil and filter change for $125.00 or a loose wire harness.
Check your transmission fluid and try not to run the blazer to hard, to replace the transmission start at $1,900.00 for a rebuilt.
Good luck and hope this helps. Keep me posted