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gear ratio

Discussion in 'Chevy Trucks' started by ABES, Jun 30, 2007.

  1. ABES

    ABES PlowSite.com Addict
    from MN
    Messages: 1,322

    how do i know what rear axle and gear ratio i have??

    thanks
     
  2. wild bill

    wild bill PlowSite.com Addict
    Messages: 1,239

    gears

    call your local chevy dealer with your vin number!
     
  3. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    To verifying what ratio your truck has, look at the "RPO code" decal in the glove box. I'm sure you've heard of this before. It's the white decal with multiple columns of three digit letters and numbers. The code "GT4" would be 3:73's and the code "GT5" is for a 4:10 ratio. "G80" denotes locking differential.
     
  4. ABES

    ABES PlowSite.com Addict
    from MN
    Messages: 1,322

    thanks B@B i have the 3.73 it looks like. hopefully in the near future i will be able to upgrade to 4.10s with a locker.
     
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Happy to help bud, what type of locker are you thinking about installing?
     
  6. ABES

    ABES PlowSite.com Addict
    from MN
    Messages: 1,322

    i have no idea what kind of locker to use. what would you recomend?? i do know that i need one though after burying my truck in a mud hole yesterday a locker would have been nice.
     
  7. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    The type of locker or limited slip diff I recommend to guys is dependent on what they use the truck for and how much plowing or off roading they actually do verses how much the truck is street driven. Some true lockers are very rough and noisy when street driven so it just depends on what you do with the truck. In most cases a limited slip style diff is a much better option. What do you primarily use the truck for?
     
  8. ABES

    ABES PlowSite.com Addict
    from MN
    Messages: 1,322

    mostly street driving but on the weekends and after work and school i do a fair ammount of off roading.
     
  9. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    For only the occasional off road use I wouldn't recommend installing an aftermarket full mechanical type locker as they're very noisey and harsh on the street. You'd be much better off either looking for a used factory Gov loc or buying a new aftermarket limited slip diff like an Auburn or a clutch style Eaton . Now if money isn't an issue I'd recommend a selectable type locker like an Eaton E-locker or a Detroit Electrac.
     
  10. mcwlandscaping

    mcwlandscaping 2000 Club Member
    Messages: 2,557

    A rear end swap out will most likely be identical to the job i did, here's a thread with some pics of when i did mine a lil while ago:
    http://www.plowsite.com/showthread.php?t=46224

    just keep in mind though, if you change the gear ratio in the back, you have to do so in the front as well if you want to be able to use your four wheel drive.
     
  11. Mark13

    Mark13 PlowSite Fanatic
    Messages: 5,737

    For a good posi check out the detroit trutrac. For a full locker that only works when you want it you could get an ARB Airlocker, those things are cool, but $$$$$$
     
  12. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Normally I would have suggested a Detroit Trutrac also but they don't make one yet for the 9.5 14 bolt :mad:
     
  13. ABES

    ABES PlowSite.com Addict
    from MN
    Messages: 1,322

    thats what i have right??? the 9.5 14 bolt??

    thanks
     
  14. ABES

    ABES PlowSite.com Addict
    from MN
    Messages: 1,322

    i have thought about that but first i have to decide if i am going to go with 265s or go all out with a 4" lift and 35"s because i dont think the gov loc will like the 35" tires all that much
     
  15. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Yep. 9.5 14 bolt,33 spline axles.
     
  16. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If your going to run 35's then I'd definity go with an aftermarket unit verses a factory Gov-Loc.
     
  17. ABES

    ABES PlowSite.com Addict
    from MN
    Messages: 1,322

    thanks again B&B i think you know more than anyone else on plowsite.
     
  18. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    LOL! That's a pretty big set of shoes to fill there...but thanks for the complement ABES. I just enjoy helping good people that need it:salute:.
     
  19. Mark13

    Mark13 PlowSite Fanatic
    Messages: 5,737

    Post comment deleted, now how do I just delete this whole post?
     
    Last edited: Jul 3, 2007
  20. Mark13

    Mark13 PlowSite Fanatic
    Messages: 5,737

    I never really paid attention to that since my truck has the ever unmighty 10bolt.


    He just happens to know how to build and maintain a cool gmc k10