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  1. #11


    Thank You!

  2. #12

  3. #13


    Red Rock 4x4 is no longer in business and has no information at the listed address.
    1998 K-2500 Suburban
    454 w/ 4L80E
    Suspension Maxx T-Bar Keys Gibson Cat Back K&N Intake
    Mag-Hytec trans pan and diff cover Hypertech Programmer
    MSD 6A, Blaster Coil & Wires Roadmaster Active Suspension
    Hummer H2 wheels w/ BFG All Terrrain T/A KO

  4. #14


    Great Find. But. Heres the question? Will the computer have to be recaled? I just bought a 09 Sierra. Wanna go from 18's to 22's.

  5. #15

  6. #16


    Quote Originally Posted by unplugged View Post
    Here are links to sites with tire size calculators.
    Chart of vintage tire sizes:
    Tire size comparator that indicates speedometer error:
    Metric to standard & standard to metric conversion:
    Speedo, tach, gear ratio calculator:

    A very good tire comparison calculator:
    heres another metric to standard and standard to metric calc i found since redrock is gone

    just dont look at the top of the page....
    99 Silverado 1500 Z71
    89 GMC Sierra (First Love) SOLD

  7. #17


    Here is an assortment of calculators including a torque converter slippage calculator.

    Here is pretty technical gear ratio calculator.(requires a lot of inputs)

  8. #18


    ok so if my wheel measurements are 305/50 R20 what are they in inches? so i can put it in my programmer

    ---------- Post added at 05:05 PM ---------- Previous post was at 05:04 PM ----------

    is it 32in???? for my question right above..
    2003 Silverado Extended Cab
    AEM Brute Force Intake
    PowerAid Throttle Body Spacer
    Diablo Sports Predator Programmer
    Borla Stainless Steal Shorty Headers
    Magnaflow Hi-Flow Cats
    Borla Stainless Steel Cat-Back Dual Split Side Exhaust
    20 inch OEM 5 Spoke Chrome rims with 305/50's
    2 12' Rockford Fosgate Subs w/ Kickers Tweeter's
    55 Watt 6K HID Lights

  9. #19


    Great links just found out the stock tire size the other day is 245/75/16 the tires on the truck when i bought it 2 yrs ago (which i'm gettin ready to replace) are 235/85/16 tires . I'M RUNNING 4.1 % SLOWER W / the 235/85/16's .

    glad to find out the stock size & the calculator cause maybe i can get some better gas milage now going back to the stock size.

    Later yall

    94 GMC 2500 LWB : 350 4L60E Tranny 3:42 ratio rear end Homemade Headache Rack with rails,soon to have A/C WORKING & Windows tinted & soon to have Flowmaster w/ Echo tips.

  10. #20
    Sr. Engineer Sam_A's Avatar
    Join Date
    Jul 2010
    Hattiesburg, Mississippi, United States


    Thanks for the post. Great links

    2003 Chevy Silverado 2500HD LT 4x4, Crew Cab
    6.6L Duramax Diesel (LB7) with an automatic Allison 1000 5 speed.
    Spray-in bed liner, S&B Air Filter, Homemade CAI ram scoop, ball hitch for Gooseneck
    Black toolbox, metallic-black bowtie, 5.5" NV-200C Bumper Off-Road lights behind a blacked-out grille
    285/75R16E BFG A/Ts
    Future Upgrades: Exhaust, CAI, programmer, intercooler, torque converter

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