Performance Mods for 4.7?
All Star
Joined: Oct 2005
Posts: 969
Likes: 0
From: Kentucky
RE: Performance Mods for 4.7?
Feels sluggish bc you have 3.55 gears....need to get rid of those and get 3.92's at the least.
Veteran
Joined: Mar 2005
Posts: 490
Likes: 1
From: San Antonio, Texas
RE: Performance Mods for 4.7?
ORIGINAL: TRUCK
Ross, Do you have the 3.92's in your 4.7L 5speed manual? Also, are you getting a noticable upgrade in performance with the Air Ram induction?
Ross, Do you have the 3.92's in your 4.7L 5speed manual? Also, are you getting a noticable upgrade in performance with the Air Ram induction?
Yes, 3.92's with my manual. I can leave 15ft of rubber trails when I drop the clutch.[sm=badbadbad.gif] Air ram and exhaust are for sound more than anything. Cold air induction doesnt make any noticeable difference until you get really movin. I have gone up 1mpg though since putting it on.
Veteran
Joined: Mar 2005
Posts: 490
Likes: 1
From: San Antonio, Texas
RE: Performance Mods for 4.7?
ORIGINAL: DSMxTSi
Yep! There sure is a tag in the glove box. Finally got around to looking in there, and sure enough I've got 3.92s .
But I'm at 2000 rpm at 70mph. I've got the factory 20s, would that explain the difference? I'm assuming your truck has 17s?
Yep! There sure is a tag in the glove box. Finally got around to looking in there, and sure enough I've got 3.92s .
But I'm at 2000 rpm at 70mph. I've got the factory 20s, would that explain the difference? I'm assuming your truck has 17s?
Veteran
Joined: Mar 2005
Posts: 490
Likes: 1
From: San Antonio, Texas
RE: Performance Mods for 4.7?
All Star
Joined: Oct 2005
Posts: 969
Likes: 0
From: Kentucky
RE: Performance Mods for 4.7?
Finally got around to looking in there, and sure enough I've got 3.92s . But I'm at 2000 rpm at 70mph. I've got the factory 20s, would that explain the difference? I'm assuming your truck has 17s?
Professional
Joined: Oct 2006
Posts: 151
Likes: 0
From: Millbury, MA
RE: Performance Mods for 4.7?
Hope nobody minds if I pipe in on this one...
I have the '03 4.7 reg cab SB... really loses a lot going uphill. What can I do to improve this?
I use it as a daily driver, and 98% of my miles are long distance on the highway.
I don't want to lose any tow power though, as I pull a camper in the summer.
Any ideas?
I have the '03 4.7 reg cab SB... really loses a lot going uphill. What can I do to improve this?
I use it as a daily driver, and 98% of my miles are long distance on the highway.
I don't want to lose any tow power though, as I pull a camper in the summer.
Any ideas?
Record Breaker
Joined: Apr 2006
Posts: 1,627
Likes: 0
From: Lumberton, Texas
RE: Performance Mods for 4.7?
id go with some new gears, but only if you plan on keeping it at least a few more years to let them pay for themselves. for all the highway driving youll be doing, id go with 4.10s instead of 4.56s. most people will recommend the 4.56s and they are better for performance (faster take offs, more towing power) but for the amount of highway you do id go with 4.10s.
Registered User
Joined: Jun 2007
Posts: 22
Likes: 0
From: Monterey, ca
RE: Performance Mods for 4.7?
has anyone here put the cherrybomb glasspack on thier 4.7? just wondering if ill loose too much backpressure like folks have talked about on here. also whats the diff between the fm 40's and the cherrybomb extreme anyone know? how about your Ross you seem to be the expert here or at least a hellofva lot more then myself.
so far i have a chip and cai on my05 qc 2wd 1500and that was a noticable difference!
so far i have a chip and cai on my05 qc 2wd 1500and that was a noticable difference!