Thread: Allison 6 Speed GMC 401
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Old April 15th, 2015, 03:42 AM
tommr tommr is offline
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Default Re: Allison 6 Speed GMC 401
5th and 6th are both overdrive. 6th gear would only be usable for speeds we don't travel and it is more $ to make 6th gear work in standalone. 6th gear is more suited to electronic engines.
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