New owner of 2016 f150 v8, with only 16k miles. Wanted to try out 4L and selected 4L while stopped in N. On dry, flat pavement. Drove very slowly and truck lurched from 1st to 2nd noticeably. No clunking or whinning noise, just noticeable lurch. Smoother shift from 2nd to 3rd. Only went 20-25mph. Read later not to exceed 15 and not to use 4L on dry pavement. Truck shifts back to 2H no problem, drives ok. Wondering what stress I put on transmission and if this is normal because of gearing. Should I be worried?

 

It shouldn't hurt anything as long as you drove straight.

 

Best not to use 4x4 on dry pavement. Find a loose or gravel road and see what happens. 4L can feel like rough shifts even
on my 350 when in high it feels just fine.. Being geared way down changes the shifting, when the TC locks it really gives
a bump. 4L is made for slow going.

 

yep, just a short drive down a straight road. thanks for the reply. I haven't owned a ford truck in a while but i may be a new convert

 

The shift from 1-2 sounds right.

Yes, you can do as you have described for testing purposes but no driving. At least get on a gravel road, or something like that for additional testing more than just the short distance you did. You won't hurt anything driving in 4l as long as you are not making any sharp turns. You'll find the resistance when you've turned too far. For example, you can't drive in 4l in your street then turn into your driveway without it binding.

The shift you felt is because of the high rpm and low wheel speed. It smooth's out as the difference between speed/rpm is closer matched.