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my new to me K5

Discussion in 'The Garage' started by obijuan, Jul 22, 2006.

  1. obijuan

    obijuan 1/2 ton status GMOTM Winner

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    im looking to buy an 85 k5 pretty straight an everything. it has a six inch rancho lift with 35 bfg muds. its got the 700 and i looked in the glovebox and it said 3.08 gears. this k5 will be my mostly street driven truck and not too much off road. its got the stock 350 in it and is this setup good for highway or whould i do some gear tweaking or not even buy it. seems to me the price is right for 4000.
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  2. aknight_sa

    aknight_sa 1/2 ton status

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    it looks like a streen truck but i wont say its good for the highway because of the lift... do you have a pic of its engine??

    and if you say it has a 700R4 gear box.. then i dont think its meant for offroading..

    have any info on the axles??
     
  3. k2mslskier

    k2mslskier 1/2 ton status

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    Well I have an 86 with a 4" lift, 350/700R4, 35" BFG Mud's, stock 10 bolts with 4.56 gears and it does great on highway AND offroad. I drive the freeway 18 miles a day roundtrip to work and average around 14 mpg. Having the overdrive and the lower gears helps. So I would think if you just swapped in some gears it probably wouldn't be half bad on the highway...IMO.

    Andy
     
  4. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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  5. aknight_sa

    aknight_sa 1/2 ton status

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  6. obijuan

    obijuan 1/2 ton status GMOTM Winner

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    what gears should be in it for highway use on 35?
     
  7. sandawgk5

    sandawgk5 3/4 ton status

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    My 700 does just fine with my 37s and 410s. Saying that I will be going 5.13 or 5.38 and eventually a NV4500:D .

    Obijuan-Gears are a give and take scenario, but for the most part with overdrive and 35s there is no reason you cannot run 4.56 or 4.88 and still get decent mileage and the lower gear will help your tranny live longer. I run 4.10s with my 37s and it is a dog I did not have the money to regear that is why I have such a crappy gear. Also make sure you put a large cooler on that tranny, The cooler a 700R4 is the happier it and you will be:D .

    Ira
     
  8. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    Nice truck 4000 seems fair if the rest of the truck is as nice as the pics you posted But I'd re-gear for sure
     
  9. 79k20350

    79k20350 3/4 ton status

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    i wouldnt bother re-gearing, id re-axle....14 bolt/ 10 bolt combos can be found cheap enough
     
  10. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    Yeah but then he'd need new rims (gears could be purchased for the price of new rims) and msot 10/14-bolt have 4.10's and that would be marginally better than what he has and if it's a DD 10bolts should last him a long time
     

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