AW4 no1st to 2nd shift

CABXJ

NAXJA Forum User

Location

Whistler BC

• Jan 24, 2008

• #1

2001 4.0 231 AW4 8.25 about 70,000 miles.
Have done a quick search no luck. All fuctions seem to be working well, but when I have the shifter in the 1-2 postion it does not shift from 1st to 2nd. Which is great for wheeling but I have a lot of down hill in my daily drive work like to save some of my brakes. In postion three all works fine and in D its all good. Im new to Jeeps would prefer fixing it my self so any help would be much.

Thanks

 

B

BADaXJ

NAXJA Forum User

Location

Maine

• Jan 24, 2008

• #2

i know on my '91 mj it won't shift until about 5k no matter how slow i ease into it. try shifting it down around 35-40 mph and you'll know if you've got second:laugh: or you could just mash the skinny pedal and see if it shifts. i know i've read about this before so i think it's normal. check this out...


http://www.jeepforum.com/forum/showthread.php?t=354855

 

L

lawsoncl

NAXJA Forum User

Location

North Idaho

• Jan 24, 2008

• #3

It's supposed to hold it in 1st as long as it can. If you put in in 1-2 at speed, it should drop to 2nd and then downshift to first when it can, and stay there until your close to red-line. The behavior seems to vary a little for different model years. Quite messing with the shifter and use the brakes like everyone else. :}

 

CABXJ

NAXJA Forum User

Location

Whistler BC

• Jan 24, 2008

• #4

Thanks, not the answer I was looking for, your are right I will have to live with it. Still say its wacked not being able to use 2nd when I want, now I know thanks.

 

B

BADaXJ

NAXJA Forum User

Location

Maine

• Jan 24, 2008

• #5

you can still down shift into second if you want to... the shift mod that i linked above is really very easy to do... you could lock up your tc as well which would give better engine braking.

 

L

lawsoncl

NAXJA Forum User

Location

North Idaho

• Jan 24, 2008

• #6

BADaXJ said:

you can still down shift into second if you want to... the shift mod that i linked above is really very easy to do... you could lock up your tc as well which would give better engine braking.

Click to expand...

True, but on a 2001 that mod will trigger the check-engine light. The 1998 and up trans computers have an input speed sensor and it will flag when the trans or t/c appear to be doing something other than what the TCU expects. It's a nice feature as it really helps diagnostics, but it does cause problems with simple mods like this.

 

CABXJ

NAXJA Forum User

Location

Whistler BC

• Jan 24, 2008

• #7

Thanks for the input, does anyone know what controls the shift form 1st to 2nd when the shifter is in the 1-2 position? Can it (controller, governor or ?) be adjusted so it would shift at a lower RPM? Im going to tray and get it to shift, as suggested but have a hard time with running her that high (4800+ rpm) when I feel I should not need to.

 

L

lawsoncl

NAXJA Forum User

Location

North Idaho

• Jan 25, 2008

• #8

The trans computer controls the shifting based on throttle input, engine rpm from the front sensor, output shaft speed, and shifter position. Not adjustable.