Originally Posted by Jarma36
Thats cool, our allisons shift great and feel solid but anymore than 100hp added and you gotta get it built... luckily im a mostly stock truck kinda guy and in stock form they are bulletproof it seems
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Yea I heard it goes into limp mode.. The biggest tune I've ran in my truck is spartan 310.. I've got really into this diesel performance bug.. Can't get enough. Lol.. But I'll be happy with a 650hp truck. Or mayb 700. Lol