what gear ratio?

Discussion in 'General Chevy & GM Tech Questions' started by dustin_742, Dec 7, 2009.

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  1. dustin_742

    dustin_742 New Member

    i have a 98 chevy k1500 6 lug. not a clue what gear ratio it has.. i think either 410 or 376? can someone please tell me what i have in it..

    and also when i put my truck in 4 wheel drive the front end clicks.. not like a pop or a bang it just clicks. please help me
  2. MrShorty

    MrShorty Moderator 1000 Posts 100 Posts

    We could all guess what gear ratio you have, but there's always be the chance that we were wrong. If you know that you still have the factory gear ratio installed, the best first place to look would be the RPO code list in your glove box. Look for a Gxx code, which you can then look up in any number of RPO code lists (someone posted a pdf file here a while back it seems). That will tell you what gear ratio was installed at the factory.

    My first thought with clicking from the front end is the CV joints are going.
  3. 99'HEARTBEAT

    99'HEARTBEAT Moderator Staff Member Platinum Contributor 1000 Posts 100 Posts

    As Mr Shorty has mentioned,here are the RPO code's to look for to find out which gear ratio you have,

    RPO code
    GU5 Rear Axle -3.23 Ratio
    GU6 Rear Axle- 3.42
    GT4 Rear Axle- 3.73
    GT5 Rear Axle- 4.11
  4. dustin_742

    dustin_742 New Member

    ok is it like stamped in the glove box or a list or something on the glove box.. cause i have redon the rear end oil and i think i took the stamp off the cover
  5. 99'HEARTBEAT

    99'HEARTBEAT Moderator Staff Member Platinum Contributor 1000 Posts 100 Posts

    It would be a White Sticker inside the Glove box with the Vin # Number and those codes Mentioned earlier
    Last edited: Dec 7, 2009
  6. dustin_742

    dustin_742 New Member

    thank you so much.. i appreciate at it.. ive been wanting to find out so i can redo it.. and im not sure how much gear oil to put in it haha
  7. 99'HEARTBEAT

    99'HEARTBEAT Moderator Staff Member Platinum Contributor 1000 Posts 100 Posts

    l
    I think its 3 Quarts....Maybe one of the member's will help in how many for sure.
    Last edited: Dec 8, 2009
  8. dustin_742

    dustin_742 New Member

    alright.. member? lol.. this is all new stuff to me.. been a dodge boy for life then i bought this haha
  9. 99'HEARTBEAT

    99'HEARTBEAT Moderator Staff Member Platinum Contributor 1000 Posts 100 Posts

    Its 2 quarts on Rear Diff Fluid,the reason I thought it was 3 quarts is I have a Aftermarket Diff Cover that is deeper and it took one extra quart.
  10. cfanto

    cfanto New Member

    Hey, does this RPO code stuff apply to my 2003 Suburban as well?

    If so, I'll go check my glove box in the morning.

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