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Originally Posted by Freak  Thank you! I just checked and it's a D. Yes I have the owners manuel. Looks like I should also be running an attitive in my fuel. What's the best stuff to run? Oh yea, what is the difference between the two motors? I heard the 3500 has 20 more HP is that true? Sorry for all the questions. Thanks | The 3500 and 2500HD have the same hp rating with the allison. You don't have to run an additive, but if you want, stanadyne and racor is the only "approved" additive for the fuel. You can use power service additive too. I have in the past when I couldn't get stanadyne.
__________________ 2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7
4" turbo back MBRP exhaust
TST Powermax Programmer, Diablosport Predator
285/75-16 BFG T/A KOs, Eagle Alloys Series 187
Clifford 2 way remote start, High Idle, Bilsteins
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