I can tell you , at least when I put it in low at almost a stand still ,on the Beach, it never came out of low when I hit paved road , it was screaming at around 40 mph , it's what alerted me that it was still in low , whatever . Never activated it while driving at highway speeds , was afraid to .I can say on my base model L doesn't lock it into 1st gear. When going down a hill on the interstate it would just maintain engine braking and hold whatever gear would give me the right rpm.
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