Transmission shifts into overdrive to early

J

jeeptx23

NAXJA Forum User

Location

Nederland TX

• Mar 14, 2009

• #1

I did a search and couldn't find much on this. I have a 2001 cherokee with a 4.0 and automatic. At times it seems to shift into overdrive when i get to about 45mph. It drops the rpms down to about 1400 and it seems like it is lugging the engine until i get up to highway speeds. I have not made any mods to this jeep yet and still have factory size tires on it. If i hit the brakes the tcc will unlock but as soon as i let off it upshifts again. Anybody else having this problem or know the fix? Thanks, Adam

 

techno1154

NAXJA Member

NAXJA Member

Location

In the islands

• Mar 14, 2009

• #2

With light pedal pressure, light load in the XJ and on flat ground, 45 is about right +/- . If you want to shift out of OD just release the pedal then pedal again. It works every time. Try to drive faster or select 3 to avoid that (although in 3, it will also shift into OD except that it will have a bit more RPM's).

 

xcm

NAXJA Forum User

Location

Southern Oregon

• Mar 14, 2009

• #3

make sure your tps is adjusted, and doesnt have flat spots.

 

J

jeeptx23

NAXJA Forum User

Location

Nederland TX

• Mar 14, 2009

• #4

I just figured if it was shifting properly it would be doing it all of the time. I have been driving in third around town and only put it in overdrive when I know I will be getting on the highway. I just doesnt feel right or sound right if you know what I mean. Because once it locks up if i slow down to 35mph it still stays in OD

 

L

lawsoncl

NAXJA Forum User

Location

North Idaho

• Mar 14, 2009

• #5

xcm said:

make sure your tps is adjusted, and doesnt have flat spots.

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Not adjustable on a 2001, but yeah the TPS would be the first thing to check assuming this is a change from previous behavior.

 

techno1154

NAXJA Member

NAXJA Member

Location

In the islands

• Mar 15, 2009

• #6

It should not stay locked at 35 MPH. What happens if you were to release the go pedal and press it again, or just press harder? Would it down shift then?

I too would look at the TPS.

 

99_XJ_

NAXJA Forum User

Location

Howard, Ohio

• Mar 15, 2009

• #7

? I'm Confused. I always put it into Overdrive where ever. Am I not supposed to or what? Whats the proper way to use that tranny.? 99 4.0.

 

techno1154

NAXJA Member

NAXJA Member

Location

In the islands

• Mar 15, 2009

• #8

99_XJ_ said:

? I'm Confused. I always put it into Overdrive where ever. Am I not supposed to or what? Whats the proper way to use that tranny.? 99 4.0.

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I could see no right or wrong way to use a properly operating AW4, just shift it into 'D' and drive the XJ to your destination. Unless I am looking to play games with my XJ, I do not shift out of 'D' or use the pedal to force it to shift;... then again I spend most of my time on the highway using cruise control.

 

W

winterbeater

NAXJA Forum User

Location

Royal Oak, Michigan

• Mar 15, 2009

• #9

99_XJ_ said:

? I'm Confused. I always put it into Overdrive where ever. Am I not supposed to or what? Whats the proper way to use that tranny.? 99 4.0.

Click to expand...

Park, Drive, Reverse. All you need! Even if you are going 35MPH to the corner store. That is why it is called an AUTOMATIC TRANSMISSION. Mud pit or hillclimb, you might want to play with the other options.