I installed the Transgo Jr a couple weeks ago and I've been noticing some weird shifting. The second day it was in, while accelerating slowly from a stoplight the truck shifted out of 2nd or 3rd and went into neutral for a few seconds before shifting into the next gear. When it went into the next gear, it chirped the tires. I thought it was really weird, but attributed it to the relearning process. Well, it happened again yesterday. Also, during the past week or two, some of the shifts aren't very fast at all. Almost like it's purposely slipping between some of the shifts (mainly when accelerating slowly). Any idea what this could be caused by? I wasn't able to clear the history in the transmission, but after reading on here, it doesn't sound as if it's really necessary. I did do a 1/4-2/3 throttle acceleration through 5th gear, a 3/4 run, and a full throttle run. Not at the same time, but within the course of a day.

I installed the Transgo Jr a couple weeks ago and I've been noticing some weird shifting. The second day it was in, while accelerating slowly from a stoplight the truck shifted out of 2nd or 3rd and went into neutral for a few seconds before shifting into the next gear. When it went into the next gear, it chirped the tires. I thought it was really weird, but attributed it to the relearning process. Well, it happened again yesterday. Also, during the past week or two, some of the shifts aren't very fast at all. Almost like it's purposely slipping between some of the shifts (mainly when accelerating slowly). Any idea what this could be caused by? I wasn't able to clear the history in the transmission, but after reading on here, it doesn't sound as if it's really necessary. I did do a 1/4-2/3 throttle acceleration through 5th gear, a 3/4 run, and a full throttle run. Not at the same time, but within the course of a day.

Sounds like a problem with the new trim valve installation. Make sure the balls are in the trim valves and make sure you drilled the correct holes in the spereator plate.

Everthing was done exactly as the directions stated. I even read and looked at the step-by-step thread posted on here with good pictures. The symptoms only occur occasionally. Wouldn't it be happening with every shift if I had drilled in the wrong places or if the balls had fallen out of the trim valves during installation?

Everthing was done exactly as the directions stated. I even read and looked at the step-by-step thread posted on here with good pictures. The symptoms only occur occasionally. Wouldn't it be happening with every shift if I had drilled in the wrong places or if the balls had fallen out of the trim valves during installation?

You are stating that you could not have made a mistake; correct?

Mike knows a few things about these things, i wouldnt question him.

X2 I would double check the installation, and did you reset TAPS or just run with it?

You are stating that you could not have made a mistake; correct?

I'm not saying that. All I was saying is that I'm about 90% sure everything went together as it should have.


dmerre89,
There's nothing wrong with questioning people. The reason I asked that is because if there COULD be something else going on, I would be inclined to suspect that first. I would say that I am mechanically inclined, but everyone makes mistakes... If there isn't anything else that could reasonably be causing the symptoms, I'm still curious as to why it would only be doing it occasionally. For no reason other than for my own knowledge. I don't know THAT much about auto transmissions, so that's why I'm asking...

X2 I would double check the installation, and did you reset TAPS or just run with it?

I didn't reset the TAPS. I know that it helps the transmission learn faster, but I've also heard that it's not a big deal if you don't (so long as you don't mind waiting a little longer for it to learn and get the shifts right). If this is wrong, I'll have them reset...

I just did this install today and have yet to see a problem arise. However, if I were to experience some weird shifting in the near future, I would be inclined to double check the trim valve installation just to be sure. I have my fingers crossed that I don't have to drop the pan and guts again, but would if it was even the slightest chance of being the problem. It wasn't that hard to do and you can reuse the fluid.

I didn't reset the TAPS on my TCM and it really isn't shifting that much differently than before, except that the shifts seem to be crisper/firmer without any lag. I had a few hiccups but nothing I would call a hard shift or a problem. We'll see as time goes on...

I also am experiencing the exact same thing. I did mine almost 1000 miles ago and all was good until now.:mad:

Sounds like a problem with the new trim valve installation. Make sure the balls are in the trim valves and make sure you drilled the correct holes in the spereator plate.
If there was a mistake in the seperator plate do you sell them and if so how much?

Well I dropped my valvebody tonight and found one of the small springs was broken in two!:eek: I put the old valves back in but haven't added any fluid yet as I am waiting to get in touch with MikeL and TransGo to see if the drilled plate will work with stock trim valves.:mad:

I haven't had a chance to pull mine apart again, but I just got a CEL. I scanned it with my Stealth2 and it showed the code P0848. Anyone know what that is and whether there is something specific that could be the cause?

Transmission Pressure switch 2 circuit high. I would double check the install, and make sure all the orings on the PSM are still there and not torn, as well as the orings on the solenoids. and make sure the valves move smoothly in their respective bores.