40 - 50 MPH RPM bog down

[dkearsKJ]

I have an 05 Libby roughly 118000 miles on her.
When I start accelerating last 40mph the RPMs rise to 2000 then decrease to 1000. If I let off the gas it goes back to 2000, if I really give it some gas it avoids the whole bog down feeling. Now I thought my rear upper control arm would solve the problem because the bushings were worn. I replaced the whole arm with a Mopar one and got my tires re balanced just in case that played a factor. Before that when the RPMS would drop there was a rear end "rumble strip" feeling/sound, now with the arm in the RPMs still drop but there's very very little rumble. Once it's over 50 the ride is fine. I need help!! Is this a ****** problem?
:shrug::thumbsdown::blah:

 

[renegade 04]

This is normal, it occurs because the overdrive is kicking in and your torque converter is locking up.

 

[dkearsKJ]

So There's no Fix To This problem? When I first got her I don't remember it being like this. It's almost as if it shifts up a gear a few seconds too early.

 

[ftaa]

change ****** fluid

 

[LibertyTC]

I normally leave the overdrive off until it hits 55-60 mph, or anytime going up the hill, take the OD off & go ahead just blow the dust out!
Around that 40-50mph zone it does like to bog down especially if any kind of hills are involved.
The transmission fluid I would recommend having it serviced by the dealer every 50k miles.
They will have the recirculating machine that will get all of the old fluid out, including what is in the torque converter etc. A simple pan drop w/ filter, only gets some of it out.
Also for overall general less rolling resistance and longevity of the rear axle especially if noises are heard, new gear lube every 20 k miles is a good thing to get into.
If you have a trac loc you need the limited slip added lube. Front diff & TC should also be addressed every 40 k if itz a 4x4.
The other thing to mention is that these transmission are fully electrically controlled and have learning capabilities.
If you drive like Grandma...it learns /expects those put put..shift points.
idea.gif Try disconnecting both battery terminals for 5 minutes to reset/clear codes & then and start driving it more aggressively. drive.gif
The new shift points may help it understand that hey I need you not to bog out between 40-50.
If you are still really concerned that you still have any kind of shifting issues, then any history or pending or stored codes can be read by plugging into the OBD2 port by a dealer or high end shop scanner.
So don't remove both battery cables & clear the codes if you intend on having the Jeeps codes read tomorrow morning.

 

[dkearsKJ]

I did have a check engine light that was on for about a day then went away, the code was a multiple misfire, does this play a role?