You can hear if it's locked or not. I was returning from Hallett a jillion years ago and found myself unlocked in 4th in some crosswind for like 15 minutes. When I finally looked down the trans (not a 4L60) was rocking out at like 230! I pulled it back to 3rd, let lock, and the temp dropped like a rock. Just gotta keep an ear open for it.
RM CMC Director
Ah. I will go thru the menus to find transmission temp. Should be in there somewhere.
I am familiar with the partial lock from the built 4L60 for the GTO. Occasionally would come unlocked in the middle of a corner. Not a big deal after is happened a couple of times. But at least I know about for towing so to keep an eye out.
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