Shift issue, TSB 18-012-11 update result
My GC was made in 12/2011, so don't think it had any updates since the first update came out that month. My GC has driven fine for the most part, but once when going up a hill, I gave it some gas and it just bogged down for a second quite noticeably. Like RPM's even shot down.
So I went in for the update, after reading the symptoms, a couple which I had.
They did the update, and it's only been a couple days, but I can immediately tell a difference in driveability at lower speeds. When "casually" driving, I don't have to give it as much gas to kick down a gear, it just seems to be smarter and stay in the powerband better. Same for going from a stop up a hill, it stays in a better gear longer.
It won't make the 3.6 a Hemi or anytihng, so don't expect miracle results, but I definitely like it better how it drives, and recommend getting it.
2011 GC Laredo 4x4
3.6L w/ QT-1
RRO Leveling Kit
265/70/17 BFG Rugged Terrains