Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Best Gear Ratio for my K5, help appreciated

Discussion in 'The Garage' started by sled_dog, Aug 21, 2003.

  1. sled_dog

    sled_dog 1 ton status

    Joined:
    Sep 3, 2002
    Posts:
    16,870
    Likes Received:
    0
    Location:
    Austin, TX
    I'm planning out the K5 project and wondering what Gear ratio I should run. I would really like to run 37" MT/Rs and I know 4.10s would be insufficient for that. How would 4.10s be with 35s? The k5 will be my daily driver and I want her to MOVE on demand. Have a fresh 350 with cam, headers, intake, roller rockers, and new carb(soon anyway) would like to translate that into a little speed when I want.
     
  2. sapper

    sapper 1/2 ton status GMOTM Winner

    Joined:
    Jul 11, 2001
    Posts:
    3,052
    Likes Received:
    0
    Location:
    NoVa
    what t-case does it have? The engine is not to important to gearing, its whatever is reducing the gears along the way to the axle. If your running a NV4500, or 700R4 i would say go with 4.88s, if not then what is more important, being able to "go" or fuel economy?
     
  3. Rolled

    Rolled 1/2 ton status

    Joined:
    Jun 16, 2002
    Posts:
    683
    Likes Received:
    0
    Location:
    Anchorage, Alaska
    4.10's should be just fine for 35's. I chose 3.73's for my 35's after searching and asking.
     
  4. sled_dog

    sled_dog 1 ton status

    Joined:
    Sep 3, 2002
    Posts:
    16,870
    Likes Received:
    0
    Location:
    Austin, TX
    SM465, she won't be doing much highway running. I was thinking 4.88s with 37s or 4.56 with 35s. If I get 8mpg or better I think I will be happy. I was getting 6 when I drove her, and thats with 32s and 2.73s. It is an NP208 and I don't plan on changing that any time soon.
     
  5. Confedneck

    Confedneck 3/4 ton status

    Joined:
    Nov 1, 2002
    Posts:
    5,236
    Likes Received:
    0
    Location:
    Lehigh Acres, Florida
    4.56s and 37s with an sm465 should do pretty well im planning on 4.56s and 38s with an sm465..
     
  6. mudhog

    mudhog THEGAME Staff Member Super Moderator

    Joined:
    Nov 6, 2000
    Posts:
    17,899
    Likes Received:
    2
    Location:
    portland oregon
    i run 38's 4:10's and a sm465np205 combo and if i could id be running 5:13's with my setup but i also don't do much highway driving so i would say 4:88's would be a very good choice with 37-38's and 4:56's with 35's just my .02 /forums/images/graemlins/thumb.gif
     
  7. sled_dog

    sled_dog 1 ton status

    Joined:
    Sep 3, 2002
    Posts:
    16,870
    Likes Received:
    0
    Location:
    Austin, TX
    I think I will got 4.56s and decide tire size later. No matter what I do the lift and everything but the tires will be the same so I can decide that later. My K5 is WAY undergeared now and it does nothing but anger me all the time so I really don't want that. I mean in 4th gear if there is a little hill the truck loses speed rather than builds it.
     
  8. m j

    m j 1/2 ton status

    Joined:
    Dec 28, 2001
    Posts:
    4,606
    Likes Received:
    0
    everyone has a different rpm they will tolerate on highway
    I like LOW rpm, 2600 @55-60 is too much for me at cruise
    4.88 too deep for me.
    4.1 and a doubler for offroad I would go
     
  9. Skigirl

    Skigirl 1/2 ton status

    Joined:
    Apr 2, 2001
    Posts:
    2,563
    Likes Received:
    0
    Location:
    Los Angeles, California
    I have 4.10's with 35's, a 350 with true dual exhaust, no cats, everything else on the engine stock, 203 and th400. I can get the truck up to speed OK, and it does very well at highway speeds, but won't beat anyone off the line. Maybe if I romped on the gas. Of course then there's 0 MPH /forums/images/graemlins/eek.gif
     
  10. sled_dog

    sled_dog 1 ton status

    Joined:
    Sep 3, 2002
    Posts:
    16,870
    Likes Received:
    0
    Location:
    Austin, TX
    not a chance of a doubler. I wheel in 4 wheel high and drive all the time. Only time I put it in 4lo is for light crawling which I rarely do(but will probably be doing more often when the k5 is more capable). I usually just drive the truck and hit mud holes and like wheel speed so 4hi it is.
     
  11. TxK5Blazer

    TxK5Blazer 1/2 ton status

    Joined:
    Aug 13, 2000
    Posts:
    593
    Likes Received:
    0
    Location:
    Floresville, Tx
  12. bigjbear

    bigjbear 1 ton status Staff Member Moderator

    Joined:
    Feb 18, 2000
    Posts:
    13,970
    Likes Received:
    449
    Location:
    Marietta GA
    With no OD 4.56 & 35s or 4.88 & 37s. SEARCH
     

Share This Page