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  1. C

    Need help with LB7/Allison 5 Speed

    My apologies if I came off as a smart ass on my last reply. In a fit of anger I ripped the TCM out of the truck last night and forgot about it being unplugged this morning, I started the truck to try and back it out of my shop to have space and lo and behold I threw it in drive and now I have...
  2. C

    Need help with LB7/Allison 5 Speed

    So the “solenoid test” feature on Allison DOC that allows you to test duty cycle and listen for each individual solenoid actually does nothing? Also I’m pulling the tranny and going to rebuild completely thank you all for the help. 👍🏻
  3. C

    Need help with LB7/Allison 5 Speed

    Also I did a solenoid test and all solenoids make an audible click besides Solenoid C. Which happens to be one I replaced. I am going to drop the pan again, clean all connections and test again to see if it changes anything. If not I’m going to purchase a new VB
  4. C

    Need help with LB7/Allison 5 Speed

    The reverse trim or “A” trim is what I meant.
  5. C

    Need help with LB7/Allison 5 Speed

    Update : Removed box tuner, Allison software now communicates with TCM is showing all shift solenoids except the reverse solenoid staying on at all times. I am going to install the new pressure switch and see where that gets me.
  6. C

    Need help with LB7/Allison 5 Speed

    And another thing to add to that comment. YES I removed the box tuner in an attempt to trouble shoot the issue, it didn’t fix anything, I also checked all pins on both plugs on TCM. It is a new “rebuilt/refurbished” TCM that has maybe 15,000 miles on it. I’m also going to put my new speed...
  7. C

    Need help with LB7/Allison 5 Speed

    Update: both the Allison software and Nexiq won’t connect to the trans what so ever may be due to shitty box tuner I have, I’ll un hook in the morning and recconect the laptop
  8. C

    Need help with LB7/Allison 5 Speed

    E was sticking in the bore
  9. C

    Need help with LB7/Allison 5 Speed

    Well I started with them because that in my mind is the first thing to start with. I had power going to every thing and everywhere it should be, so I knew it was a problem with the flow of fluid or my clutches are toast. So I went to the VB next.
  10. C

    Need help with LB7/Allison 5 Speed

    I’m beginning to think it’s a sticking trim valve ... another thing to note is the truck will sometimes slam into reverse and sometimes it will go in smooth.
  11. C

    Need help with LB7/Allison 5 Speed

    Yes, and I honed the bores out. They slide free and bounce when dropped in as the paper says they should, i didn’t however put new trim valves in
  12. C

    Need help with LB7/Allison 5 Speed

    Do you think it could be a sticking trim valve?
  13. C

    Need help with LB7/Allison 5 Speed

    My old man is bringing his laptop from work that has the Allison software on it so we’re gonna see it that shows us anything more than my scanner. But yes it can read trans codes if that’s what you’re wondering
  14. C

    Need help with LB7/Allison 5 Speed

    Yes sir, when I first started it and threw it in drive it gave me a few codes, all of which were electrical For the C shift solenoid and one for the A Trim I believe. That’s why pulled the valve body and put new solenoids in. And put the new shift valves in as well. But as of now it has not a...
  15. C

    Need help with LB7/Allison 5 Speed

    And when I do give it enough throttle to move it only does so for about 5 or so seconds then goes back into neutral. I also replaced the NSBU and Ignition switch. I have a new PSM in the box and a new set of speed sensors ready to go on as well. But I’m starting to believe it’s a clutch problem...
  16. C

    Need help with LB7/Allison 5 Speed

    So I had a small incident and ended up having to replace my Tcase tail housing, extension housing, bellhousing, torque converter, and the Adaptor plate on the back of the engine. I got all this done and installed correctly as far as I know (flipped tranny on its face when installing extension...
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