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  1. F

    Odd allison problem

    On which part? I did finally get the truck going..only took a new internal wiring harness, proper internal filter, new PSM and new valve body. Though the valve body wasn't a problem until the first shop that worked on the truck did a custom grind job on the trim gain valves..
  2. F

    Odd allison problem

    I have no clue what the guy was thinking that did that, but after I talked with the owner about confronting the shop that did the work, he said that the guy that did the work had recently stole $10-15K worth of tools from the shop and went out of state, has multiple warrants on him now...
  3. F

    Odd allison problem

    yeah, it completely explains why the trans wouldn't move even in limp mode (harness unplugged). I'm just glad it's done. I only agreed to look at the truck because he took it to two different shops and the first one did that awesome job on the valve body, and the second one said it was an...
  4. F

    Odd allison problem

    The first place that the owner took the truck to did that. Which explains why the owner could drive the truck (albeit in limp mode) to the shop and then it wouldn't drive any more afterwards.
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    Odd allison problem

    Well the valve body fixed the remaining issue after getting the codes down to just the p0875. Attaching a couple of pics of the A trim gain valve, both a and b gain valves had this grinding work done to them.
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    Odd allison problem

    I went through GM for the valve body..but let me recap to say why I came to the conclusion.. Truck had been to a shop before it came to me. The owner drove it to the shop for a range inhibited problem causing a no reverse condition and when the guy got done with it, it would no longer move on...
  7. F

    Odd allison problem

    Ive tested the wiring harness (external) and it reads perfect from the trans to the tcm, the pressure switch manifold is new, the internal wiring harness is new, new internal filter with filter lock, and I went through the valve body, which is when I discovered the A and B gain valves didn't...
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    Odd allison problem

    On a side note, anyone happen to have extra a and b trim gain valves laying around? Be happy to buy a set, or know where to get them, as I haven't had much luck sourcing them.
  9. F

    Odd allison problem

    Tore the valve body all the way down, lapped the mating sufaces on both halves, ran a bore brush through all the valve bores, cleaned everything three times and put everything back together. Same codes 700 and 875. On a side note, does anyone have a close up picture of the gain and reverse...
  10. F

    Odd allison problem

    Checked the TCM connections, everything looked good, pulled the pan and checked continutity on the tan wire off of the pressure switch manifold and pin 4 on the TCM, ohmed out perfectly and no ground shorts. Pulled the pressure switch manifold off and all the O-rings are in place and look just...
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    Odd allison problem

    I am planning on dropping the pan again tomorrow after I check the TCM connections. I will double check the manifold O-rings are in place, as it was a new one, I didn't pay much attention to them before I installed it.
  12. F

    Odd allison problem

    I finally had time to check the truck out again. Dropped the valvebody, checked all the solenoids (ohmed good), checked all the valves and springs, everything moved free in the bores. Solenoid filter was clean, put a new internal filter (other one was aftermarket with wrong o-ring), suncoast...
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    Odd allison problem

    I will try to make some time tomorrow to work on the truck and see if I can pull codes and basic visual stuff. I appreciate the information and will hopefully have something more to give you guys something to go on to get me in the right direction.
  14. F

    Odd allison problem

    The original problem my friend had was when he would drive it, it would lose reverse after the trans got warm, going into range inhibited, but would still give him drive (limp mode) if he put it park and tried to go back into gear. So after driving it like that for over a year, he decided to...
  15. F

    Odd allison problem

    I understand needing codes for the problem with it going into range inhibited, that's not what I am asking about though. With the round connector unplugged, the trans should be in a mechanical limp mode giving me reverse and 2nd (or whatever the default fwd gear is) and it will, when its...
  16. F

    Odd allison problem

    Have an 05 duramax that has more than a couple issues. The truck will lose all gears with the harness plugged in anytime you try to put it into reverse or drive. The nsbu switch is indicating perfectly on my laptop though. Now, this is usually where I read codes and see whats going on, but...
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