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Re: GMC C7500 TOP KICK 8.1L/6SPEED ALLISON
Posted to Technical Discussion Forum on 5/7/2017

Hi Bart. There is no diagnostic information other than line pressure in GM eSI for Medium Duty C6/C7/C8 trucks with the Allison 2000 series transmissions.

The 8.1L was last available in LD GM truck applications with the Allison LCT 1000 series when the trans... Login to read more.