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Allison OEM Discuss repairing & maintaining an OEM Allison automatic transmission.

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Old 10-25-2019, 02:34 AM   #1 (permalink)
Hal StClair
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Join Date: May 2013
Location: Rio Rancho,NM
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TCU question

I bought an Allison/LLY combo out of a 2007 C5500 truck that didn't have either an ECU or TCU. I picked up both computers up from a wrecking yard and have already had the LBZ ECU reprogrammed. I was under the impression that the TCU would not need programming and that it will self learn. That being said, will the MD Allison internals be any different than the pickup's and cause any problems? It looks like the cooler lines come out under the tail rather than on the side. Does anyone know of any real differences ?
Thanks for any tips, Hal

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2007 C5500 Med Duty
6 speed Ally
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