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  1. HDN

    Allison 1545 Automatic Transmission Specs

    That's a nice-looking truck! It looks like it earns its keep! Keep in mind that the AT545/AT1545 are designed to handle a GCVW of about 24000 lbs. Even when the truck is loaded to the data plate weight and towing 6000 lbs also per data plate, the transmission will be overloaded. I got most...
  2. HDN

    Allison 1545 Automatic Transmission Specs

    You're welcome - I hope your project works out! Seeing that you're new here, I encourage you to introduce yourself in Member's Rides or the "Requirements For New Members" boards and share some pictures of your truck :)
  3. HDN

    Allison 1545 Automatic Transmission Specs

    I read your question a second time and realized that I found you an adapter plate and not a flywheel. According to the TM a flywheel swap isn't necessary, just the adapter plate:
  4. HDN

    Allison 1545 Automatic Transmission Specs

    Per PDF page 729 of TM9-2320-386-24-1-2: The part number is 23045001. I found the first reference to this on PDF page 352 of the same book under the Materials/Parts list for TRANSMISSION (IN-VEHICLE) REPLACEMENT for replacing the AT1545P with an AT545. It appears that it was common on...
  5. HDN

    Allison 1545 Automatic Transmission Specs

    What was the cost of the rebuild alone? I've seen around $2000 mentioned here a few times, with most of it consisting of replacing broken pistons and seals with 4L80E ones by an Allison shop. I'm hoping I won't need one for some time, assuming that the Military Mail Terminal it was assigned to...
  6. HDN

    Allison 1545 Automatic Transmission Specs

    Here's the service manual! Maybe it should go in the Deuce TMs section? I don't think this is in there.
  7. HDN

    Allison 1545 Automatic Transmission Specs

    That's in the service manual. I just found the PDF, which I'll post later when I get on that computer.
  8. HDN

    Allison 1545 Automatic Transmission Specs

    Thank you for that @tobyS . I listened to my truck shifting in my sound recording and I thought I heard the 4th gear re-locking. Here's a sound recording of my truck starting at an intersection and running through the gears: You can clearly hear the shift into 3rd gear, then 3rd gear...
  9. HDN

    Allison 1545 Automatic Transmission Specs

    The transmission is supposed to unlock between 3rd and 4th gear. And thank you for the 4L80E mention. That's a pretty common transmission outside HMMWV applications, I think, so it shouldn't be hard to get those parts!
  10. HDN

    Allison 1545 Automatic Transmission Specs

    Welcome! And you have a pretty rare truck in an M36A3! I think you should start another topic and post pics :cool: The locking transmissions eliminate losses between the engine and transmission through the fluid coupling (torque converter) in 3rd and 4th gear, increasing fuel efficiency. In...
  11. HDN

    Allison 1545 Automatic Transmission Specs

    I'll have to get this checked out now. Although my jerk may be different from the other guy's jerk. Probably best for me to get it checked out at the local Allison shop and have them do the ATF conversion as well!
  12. HDN

    Allison 1545 Automatic Transmission Specs

    It is my understanding that this is normal behavior for the 545 transmission. My truck and another owner's do the same thing. It just clunks into 4th gear, and the tranny takes its time shifting into third. I almost thought it was going into another gear between where it felt second and third...
  13. HDN

    Allison 1545 Automatic Transmission Specs

    I saw this posted in the 1545 failure poll and was surprised to see it wasn't repeated here:
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