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700r4 + np205? easy noob question! help!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by jekbrown, Jan 27, 2002.

  1. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    ok, i feel dumb for even asking this....but its an easy yes or no for you gear heads. ;) Did chevy ever combine the 700R4 and the np205? If not, does that mean I'll need some kinda adapter to put a 205 behind my raptor? TIA!

    Jason


    See the on-going build up of my '85 Jimmy! <a target="_blank" href=http://community.webshots.com/user/jekbrown>http://community.webshots.com/user/jekbrown</a>
     
  2. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    I'm almost positive GM did not put the NP205 behind the 700r4. You can do it, but you have to have/buy the adapter and drivesleeve that mates the TH350 to the NP205. Both the 700 and TH350 share a 27 spline male output and the same bolt pattern, but the 700 has a longer shaft stickout than the TH350. The 700 also has to be the 4WD version as the 2WD version is even longer. Along with the stock TH350/NP205 adapter and drivesleeve you will need a spacer (that accounts for the longer 700 shaft stickout), or get a new output shaft for the 700 (a 2WD or 4WD tranny can be used in this case), but it requires a total teardown.

    My suggestion is to use a 4WD 700 with the spacer as it gives more room for the front CV (can even use one of Jesse's one ton units). I used the new output shaft and had to modify my tranny pan for my stock CV even with 4" of lift (stock would have been worse). Going the spacer route gives you more room. Chances are either way you go, you will have to shorten the rear shaft and lengthen the front, it's just a matter of how much.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  3. CaptCrunch

    CaptCrunch 1/2 ton status

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    Leadfoot: Where did you get your spacer piece from ? Any more detailed info on this setup wopuld be sweet becuase I would really love convert.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  4. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Unfortuneately I did not use the spacer (as I did not know there was one available at the time). I used the new output shaft to mate it. As stated this put the t-case output too close to the tranny pan (thanks to the passenger's side stickout of the 700r). What I wished I had done was used the stock 4WD shaft and used a spacer (I have heard they are available and I would think could also be made cheap), but I didn't (and still don't) know where to get one. Others on this board have said they are available so maybe somebody who knows will chime in. You may want to check a tranny shop to see if they might have one or know where to get them.
    By going the spacer route you are better off because it will give you more room for the front CV.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     

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