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#1
05-12-2008, 10:32 PM
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97 gcl not shifting to overdrive
Guys and gals im stumped. I think that either my transmission has finally started to go or im losing something else. It strated to idle real fst the other day toabout 2k then if it sat it would go higher, well on the way home from work it wouldnt shift into overdrive either. it shifts fine through the other gears. But we unplugged the battery and i think that reset the MAP sensor or whatever. But still no OD. up to 170000 miles now. help please....
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1997 Jeep Grand Cherokee Limited Full Time Quadra Trac 4.0 InLine 6 178,000 Miles 
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#2
05-13-2008, 07:56 AM
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Re: 97 gcl not shifting to overdrive
sounds like a vacuum leak is throwing everything off. The OD will not engage if it detects low vacuum. The engineloses vacuum under acceleration and the OD is set to NOT shift when under load.
I would look for hissing sounds under hood. I know its hard when engine is running. You may have a vacuum hose that came off by the tranny. Check there.
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2001 5.3 LS Stock 6 channel Alpine 3566 Amp Jason Extreme Slam Camper Shell Michellin X-Radials 79K Miles
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#3
05-13-2008, 12:42 PM
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Re: 97 gcl not shifting to overdrive
A vacuum hose that came off by the tranny?
Quote:
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 His, 96 Limited, 5.2 Magnum, Magnaflow CatBack System, HID Head & Fog Lamps, 242 T-case swapped , Rear Trac-Loc. Chrome grill added to match the wheels.  Hers, 96 Limited I6, 242 T-case, HID Head & Fog Lamps.
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#4
05-13-2008, 12:45 PM
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Re: 97 gcl not shifting to overdrive
Have it checked for engine codes, see if anything comes up. If not have your TPS tested.
Quote:
__________________
His, 96 Limited, 5.2 Magnum, Magnaflow CatBack System, HID Head & Fog Lamps, 242 T-case swapped , Rear Trac-Loc. Chrome grill added to match the wheels. Hers, 96 Limited I6, 242 T-case, HID Head & Fog Lamps.
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#5
05-13-2008, 05:20 PM
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Re: 97 gcl not shifting to overdrive
A vacuum hose that came off anywhere, probably a large one from the sound of it.
__________________
2001 5.3 LS Stock 6 channel Alpine 3566 Amp Jason Extreme Slam Camper Shell Michellin X-Radials 79K Miles
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#6
05-13-2008, 07:21 PM
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Re: 97 gcl not shifting to overdrive
I just had to ask since the 97 transmissions are not vacuum controlled.
Quote:
__________________
His, 96 Limited, 5.2 Magnum, Magnaflow CatBack System, HID Head & Fog Lamps, 242 T-case swapped , Rear Trac-Loc. Chrome grill added to match the wheels. Hers, 96 Limited I6, 242 T-case, HID Head & Fog Lamps.
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#7
05-16-2008, 11:16 AM
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Re: 97 gcl not shifting to overdrive
Quote:
__________________
1997 Jeep Grand Cherokee Limited Full Time Quadra Trac 4.0 InLine 6 178,000 Miles
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#8
05-16-2008, 01:49 PM
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Re: 97 gcl not shifting to overdrive
There is a good chance your TPS has at bad spot at closed throttle. Did you check for vacuum leaks between the intake and head? You don't need to have a check engine light on to have a stored code, even more so for a transmission code.
Not much that can be done about the Coolant Sensor other then replacement. 80% of the time the Rear Lamp Failure is due to a burnt out bulb in the over head brake light (3 bulbs). the other 20% is a mix between a bad bulb combo and people burning out the lamp module with poor trailer wiring. Quote:
__________________
His, 96 Limited, 5.2 Magnum, Magnaflow CatBack System, HID Head & Fog Lamps, 242 T-case swapped , Rear Trac-Loc. Chrome grill added to match the wheels. Hers, 96 Limited I6, 242 T-case, HID Head & Fog Lamps.
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