13 Speed Splitter Valve Replacement

Hey there, Im having issues with my splitter on my 13 speed. The truck sat over the winter, worked perfect before it was parked, and now, the splitter isnt working. I can be going along and when I hit the splitter, and let off the pedal, it feels like the transmission goes into neutral (so to speak, its still in gear) and wont shift. What i do then, is put the shifter back into the neutral position, and slide the button back, and it goes back into gear. So far it works in the low end of the split, but not the high end (if that makes sense)

So what I have done so far, is I drained the oil out of the transmission, and i have taken apart the splitter at the back of the transmission apart as much as I can, cleaned and lubed it up a little, put it back together, and still the same thing. (just triple checking, but the splitter is at the drivers side, lower part of the transmission, and the range valve is on the passengers side at the top, correct?)

Im thinking my next step is to take apart the back part of the transmission and dig into this issue, maybe replace some of the splitter valve parts so i can get this thing working correctly.

I just wanted to hear any thoughts, or advice before I tear it all apart, and to those that have had the back part off of the transmission, what am I up against?

Im hoping to do this with the tranny in the truck, if possible. Ive taken a few transmissions out of these trucks before, and although it wasnt the toughest thing in the world to do, it was a pain in the ###!

Any thoughts or advice or whatnot welcome! Thanks in advance.

 

Yes its getting air. When I air up the truck, then turn the truck off, and play around, I can hear the air exhausting when I move the button back and forth. When I took it apart, there was air coming from the filter as well, so im assuming that is ok.

I didnt actually check the psi coming from the shifter though.

 

Would the air psi coming from the filter, not keep the transmission in the low split? Basically meaning, if its in low, and stays in low, then that air supply would be working? Or do I have that backwards?

 

It used to make the shift, but right now it doesn't. It seems like it wants to make the shift, but just goes into a neutral state. Like if I'm 12th and try to use the splitter to go into 13th, it won't go. (Or whatever the high gear is called)

Yes the shift cylinder looks good, it was a little tight, but I put a little lube in there and it seemed to move nicely. It does have the brass nut with the valve, I forgot to mention I did replace that all ready, and it does work.

Not sure of the exact model number on the tranny, will try and look for thay and post up.

I was hoping by saying a late 90s truck, that would help determine the model number haha

 

Thanks for all the help fellas. An odd turn of events happened, someone came around and out of the blue offered to buy my truck. He bought it with the splitter as is. He was playing around with the button, and he did get it to shift a few times. Im thinking I musnt have cleaned it out as good as I thought?

Anyways thanks again, and I wish I would have been able to repair it to report back what it was.