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6.0L Performance Parts Discussion What has or has not worked for you?

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Old 05-29-2009, 05:59 AM
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Low end performance

What's the best mod to improve torque under 2000rpms? I have a 3.73 rear end with 34" tires. I turn about 1800rpms at 70mph and seem to downshift a lot more than expected when towing. It also has a 4" cat back that I think only hurt the power at low rpms.
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Old 05-29-2009, 06:06 AM
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34" tires and 1800rpm at 70mph? wierd casue i have 36" tires and i turn about 1900 at 70mph. unless im looking at this wrong i would expect you to be turning more rpm
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Old 05-29-2009, 06:12 AM
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Quote:
Originally Posted by psd_va View Post
34" tires and 1800rpm at 70mph? wierd casue i have 36" tires and i turn about 1900 at 70mph. unless im looking at this wrong i would expect you to be turning more rpm
According to my GPS and tachometer. Sure you have a 3.73?
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Old 05-29-2009, 06:17 AM
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Quote:
Originally Posted by Samsonsworld View Post
What's the best mod to improve torque under 2000rpms? I have a 3.73 rear end with 34" tires. I turn about 1800rpms at 70mph and seem to downshift a lot more than expected when towing. It also has a 4" cat back that I think only hurt the power at low rpms.
The peak torque for these engines are right at 2K.

are you sure you have 3.73's? I run right at 2k at 70 MPH.
I have 325/60 R18's, which is right between a 33 and a 34.

I may be wrong, but didnt some of these truck come out with 3.55's
EDIT: looks like I was wrong

Last edited by stroken04; 05-29-2009 at 06:23 AM.
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Old 05-29-2009, 06:20 AM
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Quote:
Originally Posted by stroken04 View Post
The peak torque for these engines are right at 2K.

are you sure you have 3.73's? I run right at 2k at 70 MPH.
I have 325/60 R18's, which is right between a 33 and a 34.

I may be wrong, but didnt some of these truck come out with 3.55's
Wes the 6.0's didnt come with 3.55's at all.
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Old 05-29-2009, 06:20 AM
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Hmmm. The sticker says 3.73 with the 5 speed auto tranny? You guys have the 5-speed?
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Old 05-29-2009, 06:21 AM
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Quote:
Originally Posted by Samsonsworld View Post
What's the best mod to improve torque under 2000rpms? I have a 3.73 rear end with 34" tires. I turn about 1800rpms at 70mph and seem to downshift a lot more than expected when towing. It also has a 4" cat back that I think only hurt the power at low rpms.
At 70 with those tires you should be turning 1900-2k rpms. Are you stock or tuned
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Old 05-29-2009, 06:22 AM
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Originally Posted by Dave View Post
Wes the 6.0's didnt come with 3.55's at all.
good to know .

Thanks for the clarification
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  #9  
Old 05-29-2009, 06:22 AM
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Quote:
Originally Posted by Samsonsworld View Post
Hmmm. The sticker says 3.73 with the 5 speed auto tranny? You guys have the 5-speed?
Yes I believe everyone thats posted here so far has an auto
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Old 05-29-2009, 06:25 AM
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Quote:
Originally Posted by Dave View Post
At 70 with those tires you should be turning 1900-2k rpms. Are you stock or tuned
I won't argue between 1800 or 1900. Call it 1900 if you want. It's definitely not 2000.

Bought the truck used from a dealer. I assume it's stock but don't really know for sure. What I do know is it runs different from stock but I attributed that to the tires and cat back. I do know there is no chip. I looked.
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