90 Cherokee not shifting
09-15-2009, 04:25 PM
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90 Cherokee not shifting
Hello, new member. I was giving a 90 model Laredo 4.0 4x4 for some work.
It shifted OK for a while but was pretty soft. Now it has stopped shifting at all. Only has 1st and reverse. Fluid is good.
I am a ford guy and know very little about these trucks though I have worked on my sister's 90 2x4 several times.
I have rebuilt several small block Fords and one C4 ford transmission. If I understand correctly this is a AW4 tranny in the Jeep. Are these things fairly easy to rebuild for someone that has done a little mechanicing?
I know it doesn't have a vacuum modulator, at least I can't see one but is there anything else with these trannies that would keep them from shifting and not be an internal problem?
Any help?
Thanks
Clint
It shifted OK for a while but was pretty soft. Now it has stopped shifting at all. Only has 1st and reverse. Fluid is good.
I am a ford guy and know very little about these trucks though I have worked on my sister's 90 2x4 several times.
I have rebuilt several small block Fords and one C4 ford transmission. If I understand correctly this is a AW4 tranny in the Jeep. Are these things fairly easy to rebuild for someone that has done a little mechanicing?
I know it doesn't have a vacuum modulator, at least I can't see one but is there anything else with these trannies that would keep them from shifting and not be an internal problem?
Any help?
Thanks
Clint
09-16-2009, 01:45 PM
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That sounds incouraging. TPS? I take it that is a transmission computer? I did not take it up near that high of rpm's when I was checking it out so maybe there is hope. I'll do a search for the TPS
clint
clint
09-16-2009, 02:22 PM
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With the engine running I am getting 4.75 volts between a and d on the 4 way connector. I get zero volts between b and d. So am I right in thinking the TPS is bad? I adjusted it around and still didn't get any voltage across b and d. This would be very good news if that is the only reason it stopped shifting. It never did shift very well. I was way soft but the F100 I drive everyday has a shift kit in it so I can't be sure what is too soft anymore.
Thanks for any help
clint
Thanks for any help
clint
09-16-2009, 04:07 PM
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One thing that bothers me though. The transmission would'nt shift manually either. Would the TPS cause that also? If so then that has got to be the problem and I'll see if I can either get one from the pull a part or a new one depending on price
Thanks for any help
clint
Thanks for any help
clint
09-16-2009, 04:12 PM
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vacume solinoids in trans can cause this, its a four pack int he bottom of the trans can be removed with just pan removal, I have pulled from the JY and been fine
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09-16-2009, 04:14 PM
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you can check the tranny by unpugging the transmission control unit under the dash on the passenger side. You should be able to shift all gears if it is mechanically sound.
09-17-2009, 02:11 PM
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clint
09-17-2009, 03:04 PM
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Unplugged the tranny computer and I can shift it manually. YAHOO!
I'll hit the pull a part tomorrow and hopefully find a new looking TPS to put on there. If not I'll buy a new one. I have had luck on stuff like that in the past when gathering parts for my F100. Somebody goes through a lot of throwing parts at a truck and finally get tired of messing with it and have it hauled off. All kinds of new parts still on it.
Thanks for all the help.
Clint
I'll hit the pull a part tomorrow and hopefully find a new looking TPS to put on there. If not I'll buy a new one. I have had luck on stuff like that in the past when gathering parts for my F100. Somebody goes through a lot of throwing parts at a truck and finally get tired of messing with it and have it hauled off. All kinds of new parts still on it.
Thanks for all the help.
Clint
09-18-2009, 03:16 PM
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Bought a used TPS from the local pull a part for $7 and put it on today. Transmission shifts like it should now. Thanks for all of the help
I had visions of having to rebuild the transmission. Glad it was so easy of a fix
clint
I had visions of having to rebuild the transmission. Glad it was so easy of a fix
clint
09-19-2009, 06:27 PM
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This might should be a sticky.
One time after I bought my dad's old 88 Lincoln Town Car for a road car when I was on the road all of the time the Transmission acted like it was tore up. Slipping, grinding gears etc. I thought I was 300 miles from home with a tore up tranny.
I called an old timey mechanic I knew and he told me to check the 11 cent rubber bushing where the AOD Throttle Valve cable hooked to the Throttle body. Sure enough it had broken and slipped off letting the cable fall loose. Next day I went to the local Ford dealer and bought that 11 cent piece of rubber. The old timer working there told me he hated to think of all of the Ford AOD's that have been rebuilt and all of the people paying for a rebuilt transmission when all that was replaced was an 11 cent piece of rubber.
Thanks for all of your help
Clint
One time after I bought my dad's old 88 Lincoln Town Car for a road car when I was on the road all of the time the Transmission acted like it was tore up. Slipping, grinding gears etc. I thought I was 300 miles from home with a tore up tranny.
I called an old timey mechanic I knew and he told me to check the 11 cent rubber bushing where the AOD Throttle Valve cable hooked to the Throttle body. Sure enough it had broken and slipped off letting the cable fall loose. Next day I went to the local Ford dealer and bought that 11 cent piece of rubber. The old timer working there told me he hated to think of all of the Ford AOD's that have been rebuilt and all of the people paying for a rebuilt transmission when all that was replaced was an 11 cent piece of rubber.
Thanks for all of your help
Clint
09-19-2009, 07:27 PM
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Year: 1991
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This might should be a sticky.
One time after I bought my dad's old 88 Lincoln Town Car for a road car when I was on the road all of the time the Transmission acted like it was tore up. Slipping, grinding gears etc. I thought I was 300 miles from home with a tore up tranny.
I called an old timey mechanic I knew and he told me to check the 11 cent rubber bushing where the AOD Throttle Valve cable hooked to the Throttle body. Sure enough it had broken and slipped off letting the cable fall loose. Next day I went to the local Ford dealer and bought that 11 cent piece of rubber. The old timer working there told me he hated to think of all of the Ford AOD's that have been rebuilt and all of the people paying for a rebuilt transmission when all that was replaced was an 11 cent piece of rubber.
Thanks for all of your help
Clint
One time after I bought my dad's old 88 Lincoln Town Car for a road car when I was on the road all of the time the Transmission acted like it was tore up. Slipping, grinding gears etc. I thought I was 300 miles from home with a tore up tranny.
I called an old timey mechanic I knew and he told me to check the 11 cent rubber bushing where the AOD Throttle Valve cable hooked to the Throttle body. Sure enough it had broken and slipped off letting the cable fall loose. Next day I went to the local Ford dealer and bought that 11 cent piece of rubber. The old timer working there told me he hated to think of all of the Ford AOD's that have been rebuilt and all of the people paying for a rebuilt transmission when all that was replaced was an 11 cent piece of rubber.
Thanks for all of your help
Clint