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Unread 08-13-2012, 12:00 PM   #1
WildTornado77
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1995 ZJ 
 
Join Date: Aug 2012
Location: Jewett City, ct
Posts: 144
OverDrive Question?

Bought my 1995 JGC Laredo a couple of months ago. My first jeep, a winter vehicle. Thank You for the congrats. I think my tranny might have an Overdrive issue. On the highway I turn overdrive on and off and notice no differnce what is the RPM in OD at say 60 or like 65 MPH suppose to be?

Can any one give me a hand or maybe had simmilar issue?

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Unread 08-13-2012, 12:49 PM   #2
JustN11
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1997 ZJ 
 
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I'm on my phone, so I'm sorry if the info is in your profile, but what engine do you have? 4.0 or 5.2? There will be other things that factor into cruising rpm's, such as ride height and tire size. Those things should play a minimal role so I could get you in a ball park area. My 4.0 with OD on at stock height with 28" tires (iirc) cruises at about 1700 rpm's at 60 mph, 1900 at 65, and just a hair over 2k at 70.
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Unread 08-13-2012, 12:49 PM   #3
melk
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1996 ZJ 
 
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You should definitely be able to discern a change in the transmission, along with at ~400 change in rpms.

Likely the OD solenoid is no good.
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Unread 08-13-2012, 09:37 PM   #4
WildTornado77
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sorry for not enough info but mostly stock engine 4.0 and wheels 225/75 R15 but it sound like my tranny does not go into overdrive thank you.
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Unread 08-13-2012, 10:45 PM   #5
jnicewan
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1995 ZJ 
 
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Does the O/D light come on/off? If you are at crusing speed and cancel O/D, even if its not in O/D you should feel the T/C lock in 3rd gear, does it lock in 3rd? The T/C does not normally lock in 3rd gear and only does so when O/D is canceled off. Do you have a way to monitor data and see if its commanded, or look at TP sensor voltage, you can test TP voltage with a DVOM too. TP should be around .5-1v at idle and gradually increase to 4.5 or so at WOT.
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Unread 08-14-2012, 01:07 AM   #6
WildTornado77
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THE OD LIGHT WORKS FINE AND I DON'T SEE A CHANGE IN RPM WHEN TURN OFF OD, LIGHT ON. MY RPMS ARE AT 3,000 AT 65 MPH I NOW KNOW IT IS NOT GOING INTO OVERDRIVE. jnicewan I am more of a easy fix person so can you please no acronyms like (DVOM), (WOT).
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Unread 08-14-2012, 06:51 PM   #7
ratmonkey
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i'd suggest a trip through the FAQ thread to familiarize yourself with the basic troubleshooting and acronyms, as well as the equipment your vehicle has. then you can more easily use the search function as well as understand us better when advice is given.
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Unread 08-14-2012, 08:47 PM   #8
jnicewan
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1995 ZJ 
 
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Ok, you still should probably look at the TP (throttle position) sensor, without having a check eng light or code to go by, you will need to read the TP sensor voltage. Sometimes a TP sensor can fail within their limits and not produce a check eng light/code. The TP sensor can permit T/C (torque converter) lock up and O/D shifting. As mentioned above the problem could also be the O/D & T/C shift solenoid assy, along with numerous other things.

Since you noticed no RPM change when pushing the O/D button, I would suspect the problem is electrical. Its obvious you stated you had no O/D but since you noticed no change at all in RPM, it sounds like the torque convertor is not locking in 3rd either (with O/D off). Might be time to suspect either a TP or shift solenoid assy. It might help if you had a way to check for codes, only problem is the 95 takes a specific scan tool since its not OBD-2.
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Unread 08-28-2012, 11:28 AM   #9
WildTornado77
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Location: Jewett City, ct
Posts: 144
Replace Throttle positioning sensor and rpms are better but still not shifting into OverDrive
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overdrive , tranny problem

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