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  1. #21


    Quote Originally Posted by dsrtne1 View Post
    I'm curious to see what canis finds out because i have the same problem. Bigger tires and 4:56 gears. Thanks!
    Even if the gear ratio option is not there a little trial and error with the tire size and a GPS will dial in the speedometer. The computer doesn't know if you changed tires, rear end gears or your underwear.

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  2. #22


    Very good point Jimmie. Very true.

    2004 Silverado 2500 "Judas"
    Crew Cab and Short Bed
    6.0L Vortec
    Diablo Predator
    True Dual Exhaust: Hooker MaxFlow Mufflers and X-Pipe
    Drop-In K&N Air Filter
    Alpine Stereo System: iDA-x303 Deck, SPS-600 Front and Rear Speakers, KTP-445 Amplifier

    Future Upgrades Include:
    Cosmetic/Other: Spray-In Bed Liner, HID head lights, Leveling Kit
    Performance: Underdrive Pulleys

  3. #23


    Quote Originally Posted by canislupis69 View Post
    The numbers look good! I have been considering getting a diablo, but have a question since you own one. I am running 35 inch tires and I am swapping my gears next week. Will the diablo adjust the speedo for the larger tire size as well as swap the gear ratio size. Also, will it allow you to save your factory settings in case I ever need to take the truck in to the Chevy dealer?
    Yeah you can change gearing and tires size.

  4. #24
    Jr. Apprentice
    Join Date
    Jun 2009
    Richlands NC


    Quote Originally Posted by canislupis69 View Post
    Thanks for the help!
    Just want to chat some because you and I have the exact same set up on our trucks minus the gears. I do not have a clue on what gears I have. I am running 35's, 6 inch lift, afe cold air intake, jet performance products mas air flow sensor and throttle body spacer, 40 series flowmasters.
    I was getting low 13 mpg before I bought the Diablo Predator. I got it the day before i went on a 2000 mile round trip from Richlands NC to Arkansas and I averaged 14.56 MPG on the HWY running 70 mph. My city driving still sucks but I am happy with the bump in mileage. I used the 93 octane tune because my truck runs like night and day from using 87 to 93 octane.
    Since you have 4.56 gears, how many RPMS are you turning at 70 mph ? The local dyno shop said I might get better fuel economy by changing out my gears. I am running 2000 rpms at 70 mph by the way.

    2008 LTZ, Z71 4X4
    6 Inch lift
    AFE cold air intake
    Jet Performance Products Mass Air flow sensor
    Throttle body spacer
    Diablosprt Predator programer
    40 series Flowmasters

  5. #25


    I have not had it up to 70 yet. I just got it home yesterday from having the gears installed. It drives a lot better now. I ordered a Diablo Predator yesterday (should be in today) and I called Diablo. For my model/year truck the handheld does not adjust for gearing just tire size; however, the Tech at Diablo said that once I hood the handheld up and download my stock settings on to it, he can send me a custom tune allowing me to adjust for the new gear size. My ABS warning lights come on now due to the new gears. I had to purchase an ABS recalibrator from Superlift to fix that problem. So I am waiting until I get everything set up before doing a lot of driving.

    Bobby - North Carolina
    2008 4x4 5.3L V8
    6" Suspension Lift and 1.5" Body Lift
    20x9 Ballistic Jesters w/35" Toyo Open Country MT's & 1.5" rear wheel spacers
    4:56 Yukon Gears
    Hypertech Speedometer Calibrator
    Baja style bed mount spare tire carrier
    Flowmaster 40 series dual exhaust
    Recon Smoked LED tails/3rd brake lights/black projectors w/switchback LED's in the corners
    N-Fab Nerf Steps
    K&N CAI
    No Fear Pedals
    Tint, Line-X bedliner, Window visors, Rear wheel well liners
    Painted front grill, bow ties and door badges, de-"lettered" tailgate
    Powder coated front and rear bumpers

  6. #26


    I love the siggy quotes on this thread.

    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

    Remember: Search Before Posting | Fill out Your Profile & Signature
    * I've been saying for years that I was going to change my username, and I finally did.

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