tightgtp
04-29-2010, 11:17 PM
is it possible to replace the 5 speed allison with a 6 speed allison?
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DURAtotheMAX 04-29-2010, 11:23 PM http://www.suncoastconverters.com/gmc/gm_products.html suncoast makes a kit. $1,600. tightgtp 04-29-2010, 11:25 PM sorry i meant completely swapping stock 5 speed for stock 6 speed thefermanator 04-30-2010, 12:50 AM sorry i meant completely swapping stock 5 speed for stock 6 speed Yes, but it would still be a 5 speed when you are done as the 5 speed TCM doesn't have the programming in it to go into 6th gear stock. And a 6 speed TCM will not work in an 01-05 LLY/LB7 truck. SUNCOAST is the only way to get it to actually work in 6th gear. | ||