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Need some help with gearing and driveshfts

Discussion in 'The Garage' started by 84CUCV, Feb 20, 2007.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    I would like to remove the 700/208 from my 83K5 and put on a 400/208 from a CUCV with low miles on them. I would rebuild the 700, but i just dont have the cash now. What i need to know is will the drive shafts work with the 400/208 set up. Now a question on gearing. truck has a mild 350 400/208 combo 35" tires for now till i have the cash for 38" tires. I can go with either 4.56 gears or 4.10s. With the little i know about it i think 4.56 would be the better choice. Also, how do you think this truck will do on the highway? Will be seeing some of that too. Let me know what you guys think. as always thanks for the help
     
  2. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    your 400/208 combo should be close enough length wise to your 700/208 to not need drive shaft mods. 4.56's and 35's put me too high on rpm's for comfortable cruising @ 70 mph but was a great around town/trail gear. The 4.56 and 38's combo works really well on a non-OD auto
     
  3. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    so on the highway think i could do 60 with lower rpms and be OK?
     
  4. Zeus33rd

    Zeus33rd Smarter than you GMOTM Winner

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    T400 I think 4.56-4.88 is about right w/38"tire. 700r4 I think anything taller than 35's and 5.13's are the best idea. Ever thought about a 4l80e? TH400 w/od.
     
  5. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    i dont think i have the funds for a 4l80e. from what i know there is some big numbers with that trans. was going with a 400 because i have 4 of them.
     
  6. Zeus33rd

    Zeus33rd Smarter than you GMOTM Winner

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    lol, thats a pretty damn good reason. I would do the same. :D
     
  7. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    ill keep my foot out of it.......for a while:D
     
  8. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    IIRC I ran right around 3000 rpm at 70 which isn't terrible but my mufflers made it irritating after a few hours
     
  9. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Ok what is IIRC? thanks
     
  10. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    If I Remember Correctly (IIRC) I ran 3000 rpm at 70 with the 4.56 and 35 combo :D
     
  11. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    got it thanks
     

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