4R70W
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Tuned
Joined: Jan 2019
Posts: 364
Likes: 91
Yeah...It's really hard to tell on mine but the last "shift" has the biggest rpm drop so assume that is OD so I would say mine locks in 3.No big deal but just curious.
Hotshot
Joined: Sep 2001
Posts: 11,958
Likes: 228
Under normal driving my truck always does 1, 2, 3, lock, 4. I'm guessing it stays locked when shifting into 4th because there is not other change. I know it is locked up since slightly touching the brake unlocks it. Every 4R70W truck I have driven is like this. I think even the E40D acts the same way.
Logistics Pro
Joined: Aug 2014
Posts: 3,570
Likes: 854
Under normal driving my truck always does 1, 2, 3, lock, 4. I'm guessing it stays locked when shifting into 4th because there is not other change. I know it is locked up since slightly touching the brake unlocks it. Every 4R70W truck I have driven is like this. I think even the E40D acts the same way.
When in second, going up slight hill, I slowly push pedal to floor, as RPMs rise, and finally get to wide open throttle, I feel the TC lock.
Driving sanely, 1/4 throttle max, very rarely feel the TC lock.
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