Transmission will not shift

transmission shift solenoid, google (2012 dodge ram 1500 5.7 transmission stuck in 4th gear) theirs been a lot of problems,
check out forum below
http://www.ramforumz.com/showthread.php?t=74392
press the helpful button

When did you last replace trans filter and fluid? Dirt may be causing shift valve to stick.

take bottom pan off clean out your pressure sensor .. tends to get mini metl flakes caught up in there wich is also a bad sign that your tranny is going out but this will buy you atleast another 2 to 3 months

On most of these type vehicles, with the heavy duty and lower geared transmissions this is normal, when accelerateing hard it will stay in lower gear longer...

There are many things to consider with an automatic. Check that you have installed the kick down cable and spring correctly. If the kickdown is stuck or the spring is holding it in the wrong direction this will cause your problem. Insure your 8 pin plug is seated properly into into the sillinoid connector. Also check and see if any transmission codes have been set. Hope this helps.

Sometimes if you got a transmission that don't match the computer that controls it, you get this kind of problem. For example if you got a differenty year model from the original.

good day, you may try replacing your automatic transmission fluid, a good run will be noticeable, hope this helps, have a nice day

My 95 Cummins Dodge had the same problem and adding "Lucas Transmissiion Fix" cured it completely and permanently.

Thier claim is as follows:


Lucas Transmission Fix is a non-solvent formulas that stops slip, hesitation and rough shifting in worn transmissions and completely eliminates most seal leaks. Use in any transmission for preventative maintenance.Use also in light duty manual transmissions to increase shifting ease and transmission life.
Key Benefits

• Contains no solvents
• Lowers operating temperatures and stops foaming
• Can be added to existing fluid without draining any out
• Effective in an extremely high percentage of cases

check throttel valve cable it shoul be with adjusted to 1/32 in eather direction of the throttel stud

I had the same problem with my 96 Ram 1500. I thought I was going to have to pull it out and get it rebuilt or just replace it. That was at 134,000Km it's now got 210,000 and shifting like a dream. What I did to solve the problem was this, as follows:
1. No lucas transmission Fix makes things worse.
2. Get your self a new transmission filter and gasket
3. Grab Gunk transmission medic 12oz
4. Grab 7 Liters of Valvoline ATF+4 transmission fluid (Made for chrysler transmissions)
5. Drop the trans pan and drain all the oil, clean pan and magnet
6. start truck for 5 seconds and the pump will pour out another 1 liter
7. re-install filter, gasket and pan, then add your Valvoline ATF+4
8. Add, the valvoline, transmission medic and make sure you have the right level of fluid

That solved my transmission problems, instantly it was shifting better, I no longer had to let off the gas to make it shift. Now if you have large pieces of metal on the magnet, and it's totally covered in filings, you might want to consider rebuilding the trans. My magnet had usual clutch.         

Anyhow good luck, let me know if it did the trick for you.
Justin