The First 10,000km and the issues

[Smurfeh]

Hey everyone!

As you know this was my second swap.. the first one I don't get to use very often, but my second one I've been highway driving the bag off it. Put roughly 10,000km on it in the last 4 months. These are a few things I have noticed hat are slightly annoying and wondering if anyone has experienced the same.

Engine is a 5.3 LH6 DoD, Trans 4L60e 84 k5 blazer.

Issue:
1) The Trans does not down shift what so ever unless I come to a complete stop. Ive gotten used to manually shifting by this point. On hills it especially terrible.

2) The acceleration is trash.. however I have feeling that this is because I asked my tuner to change when the fuel enrichment comes on. I also noticed that he accidently changed my tire size in the ecm from being 31s to being 30s for some reason.. any idea on the effects that would have?

3) Engine temp is getting around 129 and then the tstat is opening and will close at 120ish.. I think that this is too cool and that the engine is really getting up to ops temp at all.. what is the average running temp you guys see with the ALUMINUM BLOCK 5.3? I assume it would be slightly cooler than an iron block 5.3?

Other than these issues the thing has been running like a top.. its first drive was a 5,000km trek across Canada to its new home.. kind of risky without having done really any trial run with it.. all I did was leak checks and then off I went.. hahaha drove with more spare parts and tools than I did of my own belongings when I moved!!

Thanks for your time guys!!