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35's and 3.08's?????

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

  1. blazen_md

    blazen_md 1/2 ton status

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    35\'s and 3.08\'s?????

    I have a 90 chevy blazer with a 6 inch lift and 35" super swamper ssr's I still have the open 3.08's in it and i was wanting some opinion on if 4.10's would be enough?

    I have a 700r

    <P ID="edit"><FONT class="small">Edited by blazen_md on 08/21/01 11:04 AM.</FONT></P>
     
  2. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Re: 35\'s and 3.08\'s?????

    What tranny are you running and/or going to run.

    There is a Right way, a Wrong way, and then there is My way. The latter is usually the most fun! [​IMG]
     
  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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  4. '73 K5

    '73 K5 1/2 ton status

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    Re: 35\'s and 3.08\'s?????

    On a previous truck I had 4.56's and 35's with no overdrive and I could still drive it on the highway. DEFINITELY go for the 4.56 gears.

    '73 K5
    Chevy good...Ford bad
     
  5. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Re: 35\'s and 3.08\'s?????

    I second Mudhog. If you have the stock 700R4 that would be in your truck, then go with 4.88's. The 700R4s are pretty weak, and if its not rebuilt to handle the stress of 4.10's and 35's, then it will give you the chance to rebuilt it soon enough![​IMG] 4.88's will suck @ss for mileage, but the bigger tires will help too...

    My .02

    <font color=red>GOT MUD???</font color=red>
    454/TH400/NP205 - 14BFF/D60/w/ 4.10s
    <a target="_blank" href=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</a> [​IMG]
     
  6. Mreetz

    Mreetz 1/2 ton status

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    Re: 35\'s and 3.08\'s?????

    I have 3.73's and 35s with no problems on the highway at all.

    1984 K-5
    4" lift
    35x12.5 MTs
    buildin a 400 for it, any info greatly appreciated
     
  7. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Re: 35\'s and 3.08\'s?????

    With the 700r4, at least go down to 4.56's if not 4.88's. Remember that the overdrive gear on the 700r4 is around 0.70:1, meaning that 4.88's would be like running 3.42 gears (4.88 x .7) on the highway with a truck without an overdrive transmission, yet you still get to retain great low end acceleration of the 4.88's when taking off and driving around town. I don't think gas mileage or over revving would be any problem at all with basically having a 3.42 axle ratio and 35" tires on the highway.
     
  8. txbartman

    txbartman 1/2 ton status

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    Re: 35\'s and 3.08\'s?????

    I have recently installed 35s on my Jimmy with a 305/700 and 3.73s. I have done a lot of research about tire/gear combinations. There have been lots of posts on this site about it.

    The key is that you need to remain in your engine's RPM power band for the kind of driving you will need it the most. For rock crawlers that don't go on the street much, they may have really tall gears 5:1+. That is because they could care less about highway performance, but they need their engine's RPM to be up there at low speeds. So, here's what you do.

    First, figure out how you will be driving it. On the highway? Only local streets? Rocks? Mud? Trails? I know for me, mine is a daily driver and used on the highway quite a bit. I need "good" gas mileage but good power at the low end. The taller the gears (lower my actual ratio), the more power I will have but the less gas mileage on the highway. Since mine is a highway driver, I used a calculator to figure out the best gearing combination. Here is a link to the one on Randy's Ring &amp; Pinion website. One of the better ones on the web. My 85 Jimmy
    Is it a bad thing when my reality check bounces?
     

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