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-   -   Transmission issue (http://www.ramforumz.com/showthread.php?t=109458)

ddenton 04-05-2012 09:25 PM

Transmission issue
 
I have a 2002 ram 1500 4x4 5.9 auto. When I'm pulling out I have times that it seems like the transmission does know which gear to stay in(especially if I accelerating hard). It will gear down then back up going back and forth. Sometime it doesn't shift and hits the limiter. It really doesn't seem to slip just not what gear to stay in. It doesn't seem as back when I pull out easy. No problem once I'm up to speed. Ideas??? I read something about the TPS sensor? What about the kick down cable adjustment?

Hope to get some ideas. Thanks!!!!!

ramvan2500 04-05-2012 09:32 PM

Quote:

Originally Posted by ddenton (Post 768952)
I have a 2002 ram 1500 4x4 5.9 auto. When I'm pulling out I have times that it seems like the transmission does know which gear to stay in(especially if I accelerating hard). It will gear down then back up going back and forth. Sometime it doesn't shift and hits the limiter. It really doesn't seem to slip just not what gear to stay in. It doesn't seem as back when I pull out easy. No problem once I'm up to speed. Ideas??? I read something about the TPS sensor? What about the kick down cable adjustment?

Hope to get some ideas. Thanks!!!!!

I rebuild them thar transmissions and I have a educated guess that it just may need a throttle cable adjustment, the TPS is actually used to determine the position of the throttle for proper engaugement of the torque converter and 4th gear.

ddenton 04-05-2012 09:57 PM

What's the best way of adjusting the cable going to the transmission?

ramvan2500 04-05-2012 10:02 PM

Quote:

Originally Posted by ddenton (Post 768979)
What's the best way of adjusting the cable going to the transmission?

Well their is only ONE way to adjust the cable and that's is at the throttle body. You want to try to adjust the cable so the throttle lever on the transmission moves in sync with the throttle on the throttle body neither it lagging behind or moving ahead. I will post a file with the instructions for adjustment, it's a factory manual and has pictures to assist you. I'll post the instructions tonight on this thread.

ramvan2500 04-05-2012 10:26 PM

1 Attachment(s)
I attached the instructions.

ddenton 04-10-2012 08:02 AM

I looked at the alignment but is looked to be good. Should I just try to go a knock at a time and test drive?

ramvan2500 04-10-2012 04:22 PM

Quote:

Originally Posted by ddenton (Post 773030)
I looked at the alignment but is looked to be good. Should I just try to go a knock at a time and test drive?

No I wouldn't go a knock at a time just incase something happens.

How you can tell if it's adjusted or not is if you open the throttle all the way up and can still pull about 1/4" more on the transmission throttle valve cable and the lever on the transmission moves in sync will the pulling.

What you may try doing might need a helper or could just use a clamp is to disconnect the cable from the throttle body and then go under the truck and have someone hold the throttle lever in it's resting position or can use a clamp to do it, then go back to the throttle body and adjust the cable from their by pulling on the cable firmly and align the cable so the mounting post on the throttle body lever and the cable hook are aligned with each other.

I do a completely different method which is difficult to explain but I visually adjust the cable so when the accelerator is at WOT I can't pull the throttle lever on the transmission open however when the throttle is at idle the lever is closed all the way. This method requires a bit of patience and a eagle eye but the results are golden.

ramvan2500 04-10-2012 04:28 PM

Quote:

Originally Posted by ddenton (Post 773030)
I looked at the alignment but is looked to be good. Should I just try to go a knock at a time and test drive?

Oh also, the adjustment might look good but it certainly doesn't mean that it is, I can pretty much promise you on a vehicle 5 years or older the cable has stretched. This adjustment is crucial because the transmission uses it to actually determine what gear to actually be in of course the governor contributs alot in this as well but the governor really just sets shift points. Anyway's getting off track their, the throttle valve is used by the valve body to know when to downshift as well, for example if you're crusing 50 and you want to pass someone you can do a partial throttle and the transmission will shift from 4th to 3rd, if you were to floor the pedal it will do a 4th to 2nd downshift. However at highspeeds usually highway speeds the downshift will be 4-3 with a 4-2 occasionally depends on the speed and RPM you're driving at.

In some instances if you're driving really slow and just floor it the valve will downshift from 2nd to 1st then once the pressure from the governor builds up on the 1-2 shift valve you will shift into 2nd and take off like a rocket from their.

ddenton 04-11-2012 01:40 PM

I'll go through the complete adjustment process. I have also read about the govenor pressure solenoid going bad and causing the 1-2 shift to be delayed or hunt back and forth. This truck has the 46RE transmission.

ramvan2500 04-11-2012 02:05 PM

Quote:

Originally Posted by ddenton (Post 774167)
I'll go through the complete adjustment process. I have also read about the govenor pressure solenoid going bad and causing the 1-2 shift to be delayed or hunt back and forth. This truck has the 46RE transmission.

That is true a faulty gov solenoid can cause erratic 1-2 up shifts and 2-1 downshifts. However usually if the gov sensor is faulty you will have erratic shifts in all gears, sometimes it's the 1-2 shift solenoid that will cause issues, I am so use to the RH series because they have only 2 solenoids at most one for OD and one for TC and having very little electronics is not only cheaper to repair but easier to diagnose because those sensors are often faulty out of the box.

Anyway's just try giving that cable an adjustment, that cable acuates a lever on the transmission which moves a throttle valve in the valve body controlling line pressure, sometimes when it's out of adjustment you can have some funky 1-2 ups and 2-1 downs and of course 3-2 downs and 2-3 ups. Generally if the cable is adjusted tight then you will have higher rpm upshifts that are firmer which will be easier on the clutches. If you loosen the adjustment you will have early upshifts that are very soft and will result in clutch wear. If you do any kind of towing, racing, or just want acceleration try adjust the cable tighter, if you want to use it for regular driving then adjust it so the cable isn't to tight but is still tought. Please know that if you adjust it for higher rpm upshifts it is going to be somewhat difficult to maintain the vehicles speed when it is below 55.

If you have the cable adjusted for redline shifts if you are going about 35 MPH and you put the pedal to the metal then the transmission will actually downshift into 1st gear rev to redline then upshift to 2nd and the truck will take off like a rocket from there.


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