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Tranny Will Not Upshift

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  #1  
Old 01-27-2009, 05:00 PM
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Default Tranny Will Not Upshift

Im experiencing some new tranny issues. Here goes:

1) 5.9l Magnum with 154k miles
2) Idle in gear is higher than normal and will pull the truck @ 10mph
3) 1st to 2nd gear shifts okay but @ higher RPMs than normal
4) 2nd to 3rd gear when cold will shift okay but @ higher RPMs than normal.
However when hot, sometimes will not shift into 3rd at all
5) 3rd to 4th gear same as 2nd to 3rd gear
6) Other findings:
a. When tranny is cold, it acts almost normal. A little high on the RPM
shift points but it shifts
b. When tranny is hot, it may or may not shift out of 2nd
c. Either cold/hot, highway cruising @ 50mph is @ 1900 rpm,
when it used to be 1500 RPM
d. When the tranny acts up (will not shift), simply turning the ignition
off and back on will correct the problem

Ive read just about all the posts on here and Im thinking it is either the TPS, TV cable or governor sensor/solenoid in the tranny. I did a trans fluid/filter change (with ATF+4) and adjusted the bands last week, but it did not help/hurt. The trans fluid was dark red, but not burnt.

Any ideas?
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Old 01-27-2009, 05:28 PM
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I'm having similiar problems with mine(98 1500 4wd) doesn't want to upshift 2-3 when hot. Someone said might be trans temp sensor and one other sensor inside the trans. I would like to take it to a trans shop, i dont think its a major repair.
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Old 01-27-2009, 07:01 PM
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Quote:
Originally Posted by gobbell1 View Post

it is either the TPS, TV cable or governor sensor/solenoid in the tranny.

Youre on the right track.
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Old 01-27-2009, 08:26 PM
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MonteC...Thanks for the reply. I read several of your posts regarding this subject and thats pretty much what I figured was next.

I'll let you know what I find out.
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Old 02-02-2009, 08:54 PM
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Update:

I checked the TPS and here is what I found:

1. Ignition in "ON", Engine "OFF", TPS connector was getting 5.1V. So I checked the TPS itself.

2. Ignition in "ON", Engine "OFF", TPS was producing .6V @ idle and 3.0v @ WOT. So I removed the TPS, bolt sleeves and adjusted the TPS a good bit to get .9 @ idle and 3.3v @ WOT (still under the recommended numbers)

However...

3. Cranked engine and went for a spin and got a) a check engine light and b) my tranny was slipping going from 3rd to 4th (while shifting up, it would act like it disengaged and rev way too high (4-5k rpm)

4. Came back and check the codes and low and behold I got a...
code #24 - TPS out of tolerance/limit
code #37 - TCC solenoid error.


Follow-up Questions:
1. It sounds like my TPS was doing okay? Any thoughts?
2. Why would I get code #37 (TCC solenoid failure) now?
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Old 02-02-2009, 10:40 PM
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Hello,

I'm a little confused, is this a Magnum car or is this a truck?
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Old 02-03-2009, 09:47 AM
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Quote:
Originally Posted by gobbell1 View Post
Update:

I checked the TPS and here is what I found:

1. Ignition in "ON", Engine "OFF", TPS connector was getting 5.1V. So I checked the TPS itself.

2. Ignition in "ON", Engine "OFF", TPS was producing .6V @ idle and 3.0v @ WOT. So I removed the TPS, bolt sleeves and adjusted the TPS a good bit to get .9 @ idle and 3.3v @ WOT (still under the recommended numbers)

However...

3. Cranked engine and went for a spin and got a) a check engine light and b) my tranny was slipping going from 3rd to 4th (while shifting up, it would act like it disengaged and rev way too high (4-5k rpm)

4. Came back and check the codes and low and behold I got a...
code #24 - TPS out of tolerance/limit
code #37 - TCC solenoid error.


Follow-up Questions:
1. It sounds like my TPS was doing okay? Any thoughts?
2. Why would I get code #37 (TCC solenoid failure) now?
The TPS out of tolerance could have delayed the shift into O/D. If a shift takes too long the computer will throw a code to indicate a problem.
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Old 02-03-2009, 09:59 AM
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MonteC,

I've readjusted my TPS to .7v @ idle (instead of the original .6v or the previously adjusted .9v) and I no longer get any engine fault codes, however I still notice two things.

1) The shift points are about 200rpms lower (was 1800 now 1600rpm)
2) The tranny stills slips going from 3rd-4th (thus causing the engine rpms to surge big time)

Two questions for you (if I may).

1. Is my TPS within limits? (I thought it should be reading 1.4v @ idle, not < 1v)
2. If my TPS is ok, where should I focus my attention next?
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Old 02-03-2009, 12:47 PM
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Hello,

Nevermind my question ealier, I have a head cold and had a duh moment. The TPS won't cause a slippage in the trans. You can adjust your throttle cable and make it shorter to make your shifts longer and may help with the slip on the 3-4 shift.
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Old 02-03-2009, 01:04 PM
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Quote:
Originally Posted by gobbell1 View Post
MonteC,

I've readjusted my TPS to .7v @ idle (instead of the original .6v or the previously adjusted .9v) and I no longer get any engine fault codes, however I still notice two things.

1) The shift points are about 200rpms lower (was 1800 now 1600rpm)
2) The tranny stills slips going from 3rd-4th (thus causing the engine rpms to surge big time)

Two questions for you (if I may).

1. Is my TPS within limits? (I thought it should be reading 1.4v @ idle, not < 1v)
2. If my TPS is ok, where should I focus my attention next?
Ive seen them at all different ranges and still work. If you are worried about it then you can replace it, but chances are a new one will be off as well.

I would work with the cable next, but if its a noticeable slip between 3rd and 4th then its a good chance that the overdrive direct clutches are on their way out the door.


Does it just neutralize from 3rd to 4th, or is it just a flare? If youre accerating and when it goes to shift into 4th does it act like nothing is there, or will the tach flare up and then shift?
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Old 02-03-2009, 02:10 PM
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TransGuy and MonteC...thanks.

1) I will check the TV cable next

2) Concerning MonteC's question(s), here goes:

Q1. "I would work with the cable next, but if its a noticeable slip between 3rd and 4th then its a good chance that the overdrive direct clutches are on their way out the door."

A1. The slip always occurs twice, then engages the correct gear and all is well.


Q2. Does it just neutralize from 3rd to 4th, or is it just a flare? If youre accerating and when it goes to shift into 4th does it act like nothing is there, or will the tach flare up and then shift?

A2. The slip always occurs under acceleration and always from 3-4. The tranny will disengage 3rd, the engine will rev high (because my foot is on the pedal..so I will let off) and it will re-engage 3rd again, disengage 3rd a second time then engage 4th and will stay in 4th.

After I check the TV cable, what next?
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Old 02-03-2009, 06:22 PM
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Quote:
Originally Posted by gobbell1 View Post
TransGuy and MonteC...thanks.

1) I will check the TV cable next

2) Concerning MonteC's question(s), here goes:

Q1. "I would work with the cable next, but if its a noticeable slip between 3rd and 4th then its a good chance that the overdrive direct clutches are on their way out the door."

A1. The slip always occurs twice, then engages the correct gear and all is well.


Q2. Does it just neutralize from 3rd to 4th, or is it just a flare? If youre accerating and when it goes to shift into 4th does it act like nothing is there, or will the tach flare up and then shift?

A2. The slip always occurs under acceleration and always from 3-4. The tranny will disengage 3rd, the engine will rev high (because my foot is on the pedal..so I will let off) and it will re-engage 3rd again, disengage 3rd a second time then engage 4th and will stay in 4th.

After I check the TV cable, what next?
How does the fluid look and smell now after you have been test driving it?
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Old 02-04-2009, 10:18 AM
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The truck is my 3rd vehicle so I've only put 200 miles on it since I did the fluid/filter change 2 weeks ago.

However, the fluid level is perfect (warm and idling). The fluid color is just as it was after I changed it (looks like new) and the fluid does not smell burnt.
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Old 02-04-2009, 01:28 PM
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Im sorry if you already answered this but what did the fluid look like before you changed it?
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Old 02-08-2009, 09:24 PM
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Update:

1. Returned the TPS to it's original .6v @ idle since adjusting it any higher didn't change any transmission issues.

2. Checked the TV cable and it was spot on!

3. Every time the tranny slipped going into 4th, it would throw a p0740 code (torque converter clutch (TCC) circuit). Which from what I can gather could mean a bad TCC or a bad TCC solenoid.

3. I also noticed that when I manually turned the "O/D Off" switch "OFF" in the cab, the slipping from 3rd-4th gear went away completely and the tranny would not throw a p0740 code either. Likewise when I turned the "O/D" switch back to on, the slipping re-occurred and so did the p0740 code. The slipping occurs when going from 3rd-4th gear under acceleration (either mild or heavy). The tach jumps 500-1,000 and the tranny slips. I let off the accelerator and let the tranny try to find 4th gear, sometimes it does...sometimes it doesn't.

4. Drained my Tranny (thanks to all those who suggested to put in a drain plug...it was a snap!!!) into a clear container. WOW...I was surprised! While it didn't smell burnt, it clearly was darker than the new stuff I put in just 200 miles ago (see pic).

So, given the p0740 code issue with the O/D switch and the dark fluid, I'm thinking my O/D unit is on the fritz.

Any thoughts!
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Old 02-10-2009, 01:07 PM
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ouch. Yeah that fluid doesnt not look healthy. Especially with only 200 miles on it.
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Old 02-10-2009, 04:54 PM
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MonteC,

Anything else I can check?

1) clean valve body?
2) clean/replace solenoids?

At this point, I plan to drive it as needed in 3rd gear. We'll see what happens
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Old 02-11-2009, 12:36 PM
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Pull the vb down and clean it up, as well as the solenoids. Might help.
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Old 02-11-2009, 04:33 PM
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Won't hurt huh!!!!

The tranny finally died today!! It would shift into any gear, but never engage. It was just like it was in neutral. However, if I let it sit for 10 minutes (engine off) it would re-engage and take me a whopping 200'.

Since it is a 3rd vehicle, I may drop the pan and clean up the VB. Couldn't hurt.

Thanks again for all your help along the way.

cg
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Old 02-11-2009, 10:09 PM
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More than likely the torque convertor clutch is fried since you are getting the 740 code and the dark fluid. If it is the convertor you are on barrowed time, short time.
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Old 02-11-2009, 10:09 PM
 
 
 
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