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1 ton gear options?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by four_by_ken, Dec 21, 2001.

  1. four_by_ken

    four_by_ken 1/2 ton status

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    Since I am going up to 44s and I have to regear the fornt Dana 60 I am getting.... I am considering regearing the 14 bolt rear also. I currently have 4.88s and I really liked the performace they had with the 39.5s.

    So, what are my choices now... I know 5.13s are available in both.

    What about 5.38s? I think Dana 60s but what about 14 bolts?

    5.87s also?
    ButI think pinion may be getting a little weak by then.

    I think 5.38s would put me at about the same gearing as I had with the 39.5s.

    Ken H.





    '86 K5 in parts
    1-ton 44 TSLs
    454 BBC, 350 trans, 205 transfer
    Rust free in Michigan!
     
  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Ken, 5.13 is the lowest you can go with the 14FF rear. [​IMG]

    However, if you were to use a D70 rear, your choices go way down to 7.17 ratio!!! [​IMG] [​IMG]



    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     
  3. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Yeah, the main shortcoming of the C14 (other than clearance) is the lack of really low gears. 5.13:1 is it. [​IMG] Like K30 said, you want to go lower, you have to go to a D70. IIRC, the D60 has the same gear options as a D70, all the way into the 7's...

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  4. four_by_ken

    four_by_ken 1/2 ton status

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    I already told a friend I would sell him the Dana 70 I can get.

    But, my 14 bolt already has a Detroit in it. And a Detroit for a 70 is like $200 more than a 14 bolt.
    5.13 wll be lowest. I migt just stick with the 4.88s as it is.

    Ken H.


    '86 K5 in parts
    1-ton 44 TSLs
    454 BBC, 350 trans, 205 transfer
    Rust free in Michigan!
     
  5. wayne

    wayne 3/4 ton status

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    Keep the 4:88's in and see how it works. I don't think there will be to much of a difference from 4:88 to 5:13 to justify the cost of the gear swap. Just take the money for the gear swap and put it toward a Doubler set up.[​IMG]

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  6. four_by_ken

    four_by_ken 1/2 ton status

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    Easier said than done. I have to regear the Dana 60 to match anyways. So, what I put in the front is going to stay there. I have 4.88s in the rear now, so chances are that is what I will stay with. But, if I wanted to change, this would be the only time I would do it.

    And I really dont see my using a doubler much at all in MI for the mud. Just dont need it. Nice to have, but just dont need it.

    Ken H.


    '86 K5 in parts
    1-ton 44 TSLs
    454 BBC, 350 trans, 205 transfer
    Rust free in Michigan!
     
  7. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I'm trying to remember how much difference there is between the 4.88 and 5.13 ratios as far as RPM's go.
    Without a calculator to figure them out, I'm trying to remember if the difference is something like around 2 or 3 hundred RPM's within the ratios. I'm not sure, but it really is not a lot of difference.
    IMO, 5.13's would run much better with 44's.
    I would like to run 4.88's with 39.5" Boggers.

    Just remember, if you stick with 4.88 and 44's, you can take the interstate/freeway speeds at a higher speed than you could with the 5.13's. [​IMG]





    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    125 RPM @ 60 MPH difference between 4.88's and 5.13's. Not really enough to justify the cost IMHO. For mud you want wheel speed anyways plus you have the Big Block low end grunt on your side...

    I'd be a little worried about the TH350 though...

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  9. four_by_ken

    four_by_ken 1/2 ton status

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    I am not really worried about RPMs too much. I am looking at low end grunt turning the tires. I never travel over 50 or 55. Never sees the highway, ever.

    Probably save money for other goodies and just stick with 4.88s and not have to touch the rear end.

    Ken H.


    '86 K5 in parts
    1-ton 44 TSLs
    454 BBC, 350 trans, 205 transfer
    Rust free in Michigan!
     
  10. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    I've got a matched set of 4.56:1 right now. I would LOVE to go lower due to my target tire size (mid-40s, considered 48s) but my C14 is limited. [​IMG] For me, given the cost of regear, I'm not willing to take the double step to 5.13:1. I don't even see that as worth it. After I get this thing on the trail and see how it really feels, I may go to a D70 and high 5's. No lower since the pinion starts getting really weak.

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  11. four_by_ken

    four_by_ken 1/2 ton status

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    RPMs are not really my concern. But, like you mentioned... I will just let the big block do the work.

    My foot is nice and heavy. :-)
    Never had anyone have to tell me to use more throttle!

    My truck as two speeds... stop and go.

    Ken H.


    '86 K5 in parts
    1-ton 44 TSLs
    454 BBC, 350 trans, 205 transfer
    Rust free in Michigan!
     
  12. HarryH3

    HarryH3 1 ton status Author

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    Here's a great application chart that shows what axles take what gears, lockers, etc.:

    www.4lo.com

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  13. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Thanks, Rene!! [​IMG]

    I knew the difference was not much. Heck, if the gas prices could stay down like they are now, I would go with 5.13's and 39.5 Boggers on my '82 and call it 'finished'. [​IMG]
    But I guess that all depends on how well the 454 will be built first. [​IMG] [​IMG]



    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     

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