Transmission, gears, and RPM questions.

[wcc18999]

You would be driving on the interstate at a steady 70 mph speed, and your transmission will downshift at the slightest incline. This happens whether it is in cruise control or you have your foot on the accelerator, sort of like the engine braking when going downhill. The engine braking works great at slow speeds, but at 70 mph downshift when going downhill? Seems strange.
I would appreciate any input any member may have on this question. Thanks!

[Dgee03]

I've experienced this same thing. I'll have the cruise control set at 70 then after a while i'll look down at the RPMs and notice they are high. I shift from Auto to Sport and back and that seems to get the transmission into a higher gear/lower rpm. But why should I have to do that???

[wcc18999]

Originally Posted by Dgee03

I've experienced this same thing. I'll have the cruise control set at 70 then after a while i'll look down at the RPMs and notice they are high. I shift from Auto to Sport and back and that seems to get the transmission into a higher gear/lower rpm. But why should I have to do that???

Same thing here as well and I agree with you. Why do we need to put the transmission in manual to avoid the downshifting and higher rpms? Can anyone on this forum shed some light on this issue? I explained this to the dealer and they said they did some kind of a software update but it did not change a thing. Clues, solutions, please!

[dragan]

Hi everybody
My car having same problem
I think if you driving dawn hill on 70 mph and holding accelerator on same spot car shift down to kip your sped on 70 mph if don’t car will going fester . Accelerator work lake manual cruse control. Tray to drive in the city around 45 mph for short period and relies for ¾ “accelerator and hold for 1 or 2 minute, car should shift down
Thanks

[Prodigy999]

It's normal. When going down hill, the truck will engine brake by downshifting the trans to keep the cruise control in it's target speed. Something you need to remember, these things are 100% electronics, there is no mechanical explanation you will find for the throttle control strategies. Don't worry about it unless your truck won't shift at all.