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I have a 2004 LB7 with the allison and I heard someone mention adding a 6th gear to my tranny. Is this doable? IF it is doable can the 6speed tranny handle 500+ HP. I am new to this site so if this has been discussed I apologize!
 

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Can't be done yet.....:(

Perform a search and you find out allot about trying to retofit a 5 sp Ally to a 6 spd Ally.

DEWFPO
 

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We had the northern california rep for allison at the dealer I work at today, asked him about doing this, he said it is not possible, the trans are different inside, different valve body and tcm/ecm
 
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