Question about transmission behavior

[jough]

I took a 450 mile freeway round trip today, some of which was through some steep mountains in NW AR. My trans did some weird things that I am wondering if normal.

When coasting down a STEEP hill about 70 mph, the trans would seemingly unlock the torque converter and I would get engine braking, like driving a manual trans. This would happen on the steeper downhills and it did not matter whether the cruise was on or not. Is this normal behavior for a 4L65E?

 

[ccapehartusarmyINF.(ret)]

i would think so but now that i think about it even on ford trannys ive had ive always had to manually shift the tranny into a lower gear to get engine braking
were you towing anything ? if you were was tow haul mode on?

 

[jough]

Not towing nor in tow/haul mode, just regular D.

 

[#1taho]

if that does that, that,s great. my buddy has a 4L80 and it does that, it was great for towing.

 

[ccapehartusarmyINF.(ret)]

yeah that is a pretty neat feature for towing