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  #1  
Old 10-18-2011, 11:03 AM
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lifeofchaos13 lifeofchaos13 is offline
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Default Auto Transmission Shifting Question

Hey guys got great info from my last post on issues so figured I would throw this one out and see what you guys think.

I have an 04 1500 SLT Quad Sport w/ a Fabtech 6" lift. It definately has some kind of aftermarket exhaust on it as it sets off alarms and sounds "chunky". All this stuff was on the truck when I got it.

My question is that the shift point of the automatic transmission seems real off to me. It shifts fine up to around 50 - 55 then when it shifts into 4th it immediately shifts into 5th. I do have oversize tires and the lift, I dont know if that would make a difference.

I dont know if the previous owner made any type of chip changes or adjustments. If so what would I look for to find this out? Or do you think its just an transmission issue?

Any comments are appreciated. Thanks

Last edited by lifeofchaos13; 10-18-2011 at 12:57 PM.
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Old 10-18-2011, 04:57 PM
440Magnum 440Magnum is offline
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That's exactly how they DO shift under light acceleration, and you're probably really feeling the torque convertor lockup more than another shift. Does it still seem to shift too early if you're accelerating hard?
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Old 10-19-2011, 11:19 AM
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Quote:
Originally Posted by 440Magnum View Post
That's exactly how they DO shift under light acceleration, and you're probably really feeling the torque convertor lockup more than another shift. Does it still seem to shift too early if you're accelerating hard?
Basically if im on it hard it still shifts immediately after shifting into 4th. The drop in RPM's is like drastic. When it shifts into 4th it will drop to around 2500 to 2800 then immediatley drop to 1300 to 1500.
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Old 10-19-2011, 12:47 PM
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Quote:
Originally Posted by lifeofchaos13 View Post
Basically if im on it hard it still shifts immediately after shifting into 4th. The drop in RPM's is like drastic. When it shifts into 4th it will drop to around 2500 to 2800 then immediatley drop to 1300 to 1500.

That sounds pretty odd. Any stored codes? Since you posted in the 4.7 section, I assume you have a 545RFE trans. That means full electronic control, so its not likely to be a transmission hardware problem. More likely a sensor or programming issue.
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Old 10-19-2011, 12:50 PM
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Quote:
Originally Posted by 440Magnum View Post
That sounds pretty odd. Any stored codes? Since you posted in the 4.7 section, I assume you have a 545RFE trans. That means full electronic control, so its not likely to be a transmission hardware problem. More likely a sensor or programming issue.
Im a full Noob to this truck. Only had it 2-3 months and have no idea what the previous owner did to it. Is there a way I can check for codes or where he may have changed the programing? OR do I have to take it somewhere to have that checked?
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Old 10-19-2011, 01:08 PM
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Quote:
Originally Posted by lifeofchaos13 View Post
Im a full Noob to this truck. Only had it 2-3 months and have no idea what the previous owner did to it. Is there a way I can check for codes or where he may have changed the programing? OR do I have to take it somewhere to have that checked?

Well, if you're going to keep the truck and get into working on it yourself, you can get a pretty good OBD-II reader for under $100. Its a good long-term investment- check on Amazon for some good deals, or at your auto parts store. I'm pretty happy with this one, at least in terms of bang-for-buck. It may not hold up for years, but its served me OK so far.

If you're not ready to drop cash for your own reader, a lot of auto parts stores will do a code scan for you. I think Autozone usually does.

Be aware that most OBD-II readers are limited in the specific transmission codes they can read... but they will tell you about a lot of sensors related to transmission function like TPS, input/output speed sensors, etc.
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Old 10-19-2011, 01:26 PM
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Ya im guessing if the previous owner didnt make any programming changes then it would have to be a sensor or something. Tranny doesnt give me any other issues, no leaks, weird sounds, etc.
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Old 12-13-2013, 07:33 AM
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Default HELP convertor lockup or What?

I also have a 2004 slt crew cab mine has a hemi 5.7 and a 5 speed auto the forth shift feels really strange to me . I have had the truck for a few weeks now so im not sure what it actually is supposed to feel but after a few miles and truck is warmed up a bit after it shifts into fourth almost immediately what I assume is the convertor locking up it seems alittle slow to engage like someone slowly releasing a clutch pedal im sure its the convertor because it will shift again into fith after that . im just wondering if this is normal or should I be concerned. Any help would greatly be apreciated
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Old 12-13-2013, 07:36 AM
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Default help

what I meant was after the intial fourth shift almost immediately after it does the clutch thing I don't to mess it up and need some assurance here!
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