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Old 05-16-2018, 11:57 AM   #21
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Good luck man! I know this is a tricky process for a lot of people.
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Old 05-16-2018, 12:01 PM   #22
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Originally Posted by rensch26 View Post
I got a response from Navistar. They instructed me to start the process at any International dealer. They will submit an iRequest for sixth gear approval in the Navistar service portal. I'm not positive you'd even need to bring your bus in, probably just need to provide the VIN and maybe the transmission serial number.
I wish I could get a reply as fast! When they send the letter to Allison they'll need to have very detailed info, such as tire size and speed rating, VIN, trans serial number, and rear end ratio. You'll also have to have that last page of the PDF signed to release them from liability. Wish I could sign that page and assume all liability so they would just unlock without any other steps!
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Old 05-17-2018, 11:04 AM   #23
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That 3rd page seems to be a pretty bulletproof "hold harmless" document. If the owner were to sign and submit that, a good case could be made that the OEM would have no plausible reason to deny approval. Of course, the law and common sense have nothing to do with each other.
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Old 05-17-2018, 11:11 AM   #24
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Originally Posted by dan-fox View Post
That 3rd page seems to be a pretty bulletproof "hold harmless" document. If the owner were to sign and submit that, a good case could be made that the OEM would have no plausible reason to deny approval. Of course, the law and common sense have nothing to do with each other.
I agree with this. Everyone agrees with it except Allison, and we are stuck with what they demand we do.
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Old 05-17-2018, 11:25 AM   #25
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On a closely related topic, did the John Deere software lawsuit ever resolve?
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Old 05-17-2018, 12:07 PM   #26
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Part of the problem of unlocking the 6th gear is the final rear gearing.

The Allison transmissions have a limitation of how many RPM's the output shaft can turn. Oddly, the 2000 series can turn faster than the 3000 series. I don't recall what the top speed is for either transmission but I do remember the 2000 can turn more than 25% faster than the 3000.
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Old 05-17-2018, 01:00 PM   #27
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the 1000s.. which are essentially the same as 2000's have an even taller final drive in 6th.. (.61). are used on the chevy duramaxx pickups which are designed to rev over 3400 RPM.. almost none of our school bus engines are designed to go much higher than that so seems that wouldnt be an issue on a 2000 as its final drive is .65
-Christopher
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Old 05-18-2018, 06:47 PM   #28
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No luck with Blue Bird

Apparently anyone with a Blue Bird should forget about trying to get in contact with them over this issue. If the receptionist answers, the next person won't and you won't get a return call. No response from their contact form on the website either.

Contacted my local Allison shop again and they told me to get in touch with my local Blue Bird dealer and that they would be able to get in contact with corporate. First question out of the dealer's mouth was "front engine or rear engine?" Sounds like if you're rear engine it's a possibility, but they absolutely will not unlock 6th for a front engine bus.

Reasoning is the long driveline. They're concerned that the drive shaft will come apart at higher speeds that would be capable with 6th. Tires also play a major role. Very few are rated for speeds above 75mph. Even if you restrict the bus through the Engine ECM to a safe speed they won't do it because it's too easy to have that restriction removed afterward.

There is one last option though, and I saw one other person had success with it though I can't remember who. You can email the programmer at pcmperformance.com with your TCM model type, and CIN or ASSY number and they will custom map a new TCM and send it to you. This is a much more expensive option from what I can tell.

I still want to get the price quote, but have no idea where my TCM is located. Anybody know where it would be on a 2004 International 3800 Blue Bird?
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Old 05-18-2018, 06:53 PM   #29
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The TCM for my MD3060 in a Thomas RE is behind the dash panel.
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Old 05-21-2018, 01:19 PM   #30
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Quote:
Originally Posted by rensch26 View Post
I got a response from Navistar. They instructed me to start the process at any International dealer. They will submit an iRequest for sixth gear approval in the Navistar service portal. I'm not positive you'd even need to bring your bus in, probably just need to provide the VIN and maybe the transmission serial number.
Well I got a phone call from the International dealer I submitted the iRequest through. Navistar basically told them that they could not unlock the 6th gear on my bus because it is too old. They don't have the ability or the software to do something like this on a bus as old as mine. That makes zero sense to me because International would have nothing to do with the software part of getting this gear unlocked. Almost sounds like to me they just don't want to give approval for something like this on a bus that rolled out of their factory a couple decades ago.
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