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^^^
No changes between the 2004-2008 transaxles, as far as I know. Between the 2003-2004, there was a change to the syncros, to smooth the shifts.
Also likely that, given your mileage and model year, you have lots of stress free miles on the transaxle and beating on it like some others. Assuming that the majority out there are in the same way - no problems with the transaxle at all. Doesn't mean that for the ones that did experience issues, that it was all their fault - there is still a question of production line variance and potential QC issues with parts used.
Myself and my previous Matrix XRS 6-speed (C60), which was known to be hard on the clutch itself and pops 3rd gear out - I didn't experience those at all at almost 119K miles. I even towed with the Matrix, which should have put a lot more stress on the transaxle than the usual daily commuters.
Just stick with what you are doing, no need to worry about the car.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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Sylvia
I have always maintained my vehicles better than any suggested intervals say & I've not had issues. I use Redline MT-90 in my transmissions. My 07 Matrix was cahged at 30k miles & she still shifts great. I also put in MT-90 in my 09 Corolla at 25k miles. I just bought a 07 Corolla with 63k miles & I'll put in some MT-90 this week in that car. 
Linear Mode
