i was experiencing a slipping T/C about 4 months ago. there was no BANG and down shift, IF your T/C did fail, then what you probably saw was your RPM's jump way up, and that's it, it wouldn't downshift with a bang, or nothing, it may go back to normal with some slipping, and start slipping more as you go uphill or accelerate. But a failing T/C will not keep it from going into 5th, unless its really screwed up or the computer put it into limp mode or something like that.
On a tip, one way to find out if your low on oil that results in your T/C slipping.. .Don't laugh at me too much, but how I found out, is doing a left turn around a round-a-bout, going as fast as i could around the circle without tipping/sliding side ways (+/- 28mph) and while going around the circle, hit your accelerator, if your low on fluid, your gonna see your RPM's go WAY up due to T/C slipping. What happens is G force kicks the oil to one side of the transmission. If your fluid isn't low then your car will accelerate like normal, as it does now after my problem has been resolved.
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