Jeep Doesnt go into overdrive - JeepForum.com
 
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post #1 of 5 Old 05-15-2015, 10:19 AM Thread Starter
thomashummelt
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Location: calgary
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Jeep Doesnt go into overdrive

Hello everyone, i decided that after months of on and off research into why my Jeep doesnt go into overdrive, i would join this site in hopes of finding an answer. I have looked everywhere, and tried so many things with no luck.

Here are a couple facts to take note of:

1. I had my tranny rebuilt about 8000km ago (currently at 258000), and i even took it back there and asked them to look into why its not shifting to 4th gear. They couldnt figure out why, however they offered to keep checking, but it will cost me. (hell no)

2. I have replaced multiple sensors. TPS, Crank, O2, and a couple others.

2.5. It rides in 3rd gear only (100km+), never once have i had OD work

3. Its a 4L 6Cyl 1994 Select a trac.

4. When i push my O/D on/off switch while driving at 100KM, the light comes on and the RPMS drop 200-250 (from about 2900-3000RPMS) , and thats it. Why does it do this?

5. Also my transfer case does not work, i have only 2WD, i do not dare move it into 4WD because my front diff (general area) clicks and sticks so badly i feel like it will explode, and besides, the wheel doesnt even turn.

6. If anyone is able to help me fix this problem (give me the answer), i will send you a card, filled with my tears of happiness. Im not even joking, this problem is eating away at me.

7. I did call the shop that worked on it, they replaced the OD solenoid, and they said it HAS to be an exterior issue from the tranny, so a sensor or something


Last edited by thomashummelt; 05-15-2015 at 04:13 PM.
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post #2 of 5 Old 05-15-2015, 10:30 AM
vlackattack
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2006 LJ Wrangler 
 
Join Date: Jun 2013
Location: Albany
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Normally the torque converter locks up in 4th gear (OD). When you push the OD off button, the torque converter locks up in 3rd gear. The RPM drop is the torque converter locking up. It should be doing that when you press the OD off button.
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post #3 of 5 Old 05-15-2015, 10:55 AM
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2005 TJ Wrangler 
 
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I'd check the OD on/off switch and connections. My bet is the tranny thinks you are in OD off always. There might be a signal going to the torque converter but not to the transmission.
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post #4 of 5 Old 05-15-2015, 11:17 AM
kg6mov
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Location: Cupertino
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It's not the OD switch because the torque converter lock up is working.

If the TCM was locking out OD on purpose it would turn the light on to let you know, so I would think that it's a problem with the trans itself.

Have you tried the key trick to check codes? Trans codes get blinked out through the OD light IIRC.


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post #5 of 5 Old 05-15-2015, 11:32 AM Thread Starter
thomashummelt
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Location: calgary
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I have a brand new TC in my tranny, and yes, it does it gave me 55, whereas the other CEL only gave me battery unplugged.

Last edited by thomashummelt; 05-15-2015 at 04:12 PM.
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1994 zj , overdrive , rpm , transmission

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