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Old 02-25-2019, 06:32 PM   #1
Skoolie
 
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Allison 2500PTS 6th Gear Unlock

I got to talking to an Allison dealer about unlocking 6th gear on a 2500PTS.

While it can be done, the process is bureaucratic and not guaranteed. There are two paths you can take:
  1. Allison and OEM of bus authorization
  2. PCM Performance (pcmperformance.com)

Before you start, any Allison 2500PTS manufactured AFTER June 28, 2006 is capable of taking advantage of the TCM being unlocked. Transmissions manufactures prior to this have hardware differences and must be altered (no guarantee) to work with the TCM flash. Each transmission has a date code. It follows this format YYMDD.
  1. Where
  2. YY is the last two digits of the year (06 for 2006)
  3. M is a letter that translates to the month (A is Jan, J is October)
  4. DD is the day of the month

Unfortunately, my date code os 06D28 - and manufactured prior to June 28, 2006 so mine is not able to take advantage of the TCM flash.

So here we go:
  • For an authorized Allison dealer, follow the instructions in the PDF attachment.
  • To go outside of the Allison authorization, go to PCM Performance - Alex will charge you ~$300-350 to flash your TCM or you can purchase a new one from him for $500.

Here's the mythical Allison instructions: http://www.pizoteadventures.com/down...ashRequest.pdf
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Old 02-25-2019, 07:41 PM   #2
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Most of us own older buses. I don't know what the year cut off is, but Allison regularly says "it's too old" to authorize unlocking. PCM says they don't have the hardware or software to do the early models, mine is a 99 and they wouldn't do it. Seems like the only out is to buy a computer that already has the 6th unlocked.
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Old 02-25-2019, 07:43 PM   #3
Skoolie
 
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Quote:
Originally Posted by o1marc View Post
Most of us own older buses. I don't know what the year cut off is, but Allison regularly says "it's too old" to authorize unlocking. PCM says they don't have the hardware or software to do the early models, mine is a 99 and they wouldn't do it. Seems like the only out is to buy a computer that already has the 6th unlocked.


The issue is that while the TCM I have can be reflashed, the transmission does not have the hardware required. As stated, the cutoff is June 28th 2006. Any 2500PTS manufactured before that date will not work.
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Old 02-26-2019, 01:59 PM   #4
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That's correct. The difference is in the valvebody/solenoid pack.

I know on the 1000's you can drop the pan, swap the parts, upgrade the tcm, and have 6th. I've done it and it worked well. But I'm not sure on the others. I know they're similar to the 1000 but how similar is the question.
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