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Old Mar 18, 2014 | 10:09 PM
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Originally Posted by XJwonders
When I put it in 1-2. It indeed stay in 2nd gear. So when I came to the incline, I shifted it up to 3 and it stayed there until around 3k rpms then it dropped to 1,600. Did that mean it went in overdrive even though it was placed in third?
In 3, it will lock the TC.
Old Mar 18, 2014 | 10:17 PM
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Ok I see this is supposed to be an "ask question thread" so I'm gonna jump off topic to ask a question. When I first start my cherokee my oil pressure is fine. But as she warms up the pressure drops and fluctuates as RPM's do. I've changed the oil maybe 20 miles ago and it didn't help. The jeep does have 211,000 miles so I'm sure that's the problem but I was wondering if maybe there's an oil additive out there or if I'm just going to have to do a rebuild. All feedback is appreciated
Old Mar 18, 2014 | 10:25 PM
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Originally Posted by cruiser54
In 3, it will lock the TC.
Ok so is it supposed to stay in third if it's placed In third?
Old Mar 18, 2014 | 10:31 PM
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Originally Posted by XJwonders
Ok so is it supposed to stay in third if it's placed In third?
Yes. 3rd and then lock.
Old Mar 18, 2014 | 10:32 PM
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Originally Posted by kylelangereis
Ok I see this is supposed to be an "ask question thread" so I'm gonna jump off topic to ask a question. When I first start my cherokee my oil pressure is fine. But as she warms up the pressure drops and fluctuates as RPM's do. I've changed the oil maybe 20 miles ago and it didn't help. The jeep does have 211,000 miles so I'm sure that's the problem but I was wondering if maybe there's an oil additive out there or if I'm just going to have to do a rebuild. All feedback is appreciated
TEST your oil pressure with a mechanical gauge which can be "rented" from your local parts store. VERIFY the oil pressure readings. Chances are your oil pressure sending unit is Kaput.
Old Mar 18, 2014 | 10:53 PM
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Originally Posted by cruiser54
Yes. 3rd and then lock.
by locking, u mean going in overdrive? I'm not sure what the term actually means?
Old Mar 19, 2014 | 12:18 AM
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Originally Posted by XJwonders
by locking, u mean going in overdrive? I'm not sure what the term actually means?
No, the torque convertor locks up. This isn't the same as going into 4th gear.

Torque convertors:
http://auto.howstuffworks.com/auto-p...-converter.htm

Overdrive
http://auto.howstuffworks.com/automa...nsmission8.htm

Read and learn
Old Mar 19, 2014 | 03:46 AM
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Originally Posted by cruiser54

Yes. 3rd and then lock.
Interesting. I didn't think the TC still locks up in 3rd. Wouldnt that do damage to it if towing. I still learn things every day lol
Old Mar 19, 2014 | 06:34 AM
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Originally Posted by kylelangereis
Ok I see this is supposed to be an "ask question thread" so I'm gonna jump off topic to ask a question. When I first start my cherokee my oil pressure is fine. But as she warms up the pressure drops and fluctuates as RPM's do. I've changed the oil maybe 20 miles ago and it didn't help. The jeep does have 211,000 miles so I'm sure that's the problem but I was wondering if maybe there's an oil additive out there or if I'm just going to have to do a rebuild. All feedback is appreciated
This is normal. Oil is circulated by a mechanical pump driven off the cam shaft. Higher RPM = higher flow = higher pressure. As well oil viscosity decreases when it heats up which results in lower pressure.
Old Mar 19, 2014 | 06:48 AM
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Originally Posted by cruiser54
TEST your oil pressure with a mechanical gauge which can be "rented" from your local parts store. VERIFY the oil pressure readings. Chances are your oil pressure sending unit is Kaput.

What would testing it consist of? Like what do I do? And say the gauge is spot on, any suggestions on what to do from there?
Old Mar 19, 2014 | 06:50 AM
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Originally Posted by salad
This is normal. Oil is circulated by a mechanical pump driven off the cam shaft. Higher RPM = higher flow = higher pressure. As well oil viscosity decreases when it heats up which results in lower pressure.
But is it safe for the pressure to drop to almost nothing? I just changed the oil with 10w 30 which is supposed to be thicker isn't it?
Old Mar 19, 2014 | 07:01 AM
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Originally Posted by sycoglitch
Interesting. I didn't think the TC still locks up in 3rd. Wouldnt that do damage to it if towing. I still learn things every day lol
My Renix ones do. They don't go directly into 3 lock. They really on the TCU to decide.
Old Mar 19, 2014 | 08:46 AM
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Originally Posted by kylelangereis
But is it safe for the pressure to drop to almost nothing?
No. In this case you will want to screw in a mechanical testing gauge like cruiser54 suggested. The oil pressure sending units frequently croak. On a 2000 you want to verify that the sensor is bad instead of just throwing money at it as there is a bit of a problem with low oil pressure.

Originally Posted by kylelangereis
I just changed the oil with 10w 30 which is supposed to be thicker isn't it?
Nope.

By any chance does your coolant level mysteriously drop?
Old Mar 19, 2014 | 08:51 AM
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Good articles to read. Still doesn't explain why my trans is doing that on inclines.
Old Mar 19, 2014 | 08:57 AM
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Originally Posted by XJwonders
Good articles to read. Still doesn't explain why my trans is doing that on inclines.
Did you test your TPS and sensor grounds yet?



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