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if your transmission has been slipping, it means that the clutch plates and steel plates have gone. youre going to have to have it rebuilt or swapped out for a rebuilt one.
A transmission filter should never get dirty enough to prohibit the valve body and pump from getting enough fluid. unless you have driven the truck through deep water or heavy off road use.
The 99 suburban has a 4L60E or 4L80E transmission. depending on the chassis package, If you have a 1.5" rear yoke diameter(the thing connecting the trans to the driveshaft), its a 4L60E, if its larger you have the other. The trans are usually good for at least 150K miles under normal use.
That year of blazer would have the electronic transmission in it, a 4L60E I believe? A pretty common problem I have seen with people who have the same kind of vehicle is the control module for the transmission and not so much the transmission itself, especially in 4x4's. Often times this problem occurs after going out wheeling, and it's often as simple as reconnecting the plug on the tranny, or pulling it off and cleaning off the contacts, or if that doesn't work then head to the junkyard and pull the module off of one from there (and hope that it didn't have the same problem)
I would be interested to know why you kept pulling the tranny. Its possible you lost the prgram in the PCM. You may need a reflash. Where there codes. Or you may have a bad torque converter or trans oil pump.
There are to many things that can cause this problem, best thing to is go get the ECM scanned for DTC codes at a transmission shop or Auto zone or Parts Source since they scan for free.
The ECM should have DTC code in it's memory on how the transmission is Performing and have the Transmission line tested for Fluid pressure.
Good luck and hope this helps. Oh and also ways check with more then on transmission shop if there tell you that you need a new Transmission,
It could be a simple as the transmission filter falling off causing the lost of transmission fluid pressure. Check the transmission fluid too.
Very well could be taht the Computer is not recieving the Shift codes Correctly. Just for an Easy Solution, Remove the ECM Fuse from the Fuse panel for 2 or 3 Minutes to Reset the Computer and let me know what you get.