Np205 Front yoke options

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1bigk10, Jan 15, 2002.

  1. 1bigk10

    1bigk10 1/2 ton status

    Dec 20, 2001
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    Medford Oregon
    What are the yoke sizes for the front ouput on an Np205does anyone know? 1982 K10 Silverado. <img src=> 327 SHPE powerplant SM465/205,15"custom lift 38.5"TSL/SWAMPERS 12boltrearD44 front,3.73 gears.
  2. Leadfoot

    Leadfoot 1/2 ton status Premium Member

    Nov 28, 2000
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    Western Massachusetts
    <blockquote><font class="small">In reply to:</font><hr>

    Front output shafts:
    GM used two front output shaft configurations, one had a spline count of 10, the other was a 30 spline. 10 splines came before 1977 (roughly) 30 spline shafts came after 1977 (again, roughly).
    One quick way to tell them apart is by the fact that 10 splines came with a 1310 series yoke output, capable of accepting a CV or yoke driveshaft. 30 spline shafts came with the flat flange on the output, capable of accepting the GM 3R series CV joint.

    Strength wise, the 30 spline is the way to go. The 10 spline shafts have been known to break, usually in abusive applications (big blocks, 40"+ tires, etc). 30 spline shafts seem to hold up well, especially since there isn't anything in a front axle that can take the torque required to break the finer spline t-case shaft. Also, the 1330 CV joint should be a little stronger unit overall due to the wider crosses. Practically speaking, it's nice to have the fine spline, but if you're running a 1/2 or 3/4 ton front axle, the front will break long before the NP205 10 spline output. At that point, it comes down to ease of service, yoke choice, and other such factors.

    Yoke Choices:
    For this one we consulted Tom Wood of Tom Wood's Custom Driveshafts. The 10 spline output will accept a 1310, 1330, or 1350 ujoint yokes, and of course the 1310 CV joint.
    The 30 spline output will accept the 1330 or 1350 CV joints.
    This info is incomplete, we were unable to reach Tom at the time this was written.

    Ease of use:
    We prefer the flat flange output on the 30 spline output shaft due to the fact that you can actually put a socket on the bolts that hold it together from the front. The yoke style CV joint is a real pain to install since it uses fine thread bolt installed from the rear of the yoke. Nothing like turning a 5/16" fine thread bolt 1/8" of a turn at a time with an end wrench. GRRR. Other than that, there may be details that a drive shaft shop would be best suited to helping you with.

    Heavy duty upgrades:
    There are 2 heavy duty upgrades that you may be interested in. One is the current availability of 1350 series CV jointed drive shafts. The most common configuration of these shafts is a flange connection. There are 2 ways to get these to connect to the NP205. One is to use a lightly modified standard 30 spline front output flange. The mods must be done on a lathe, but it's not much work once it's chucked up.
    The other way to connect the 1350 CV is to use a Ford 32 spline NP205 front output shaft and use a specialty flange type output.
    The other HD upgrade is using the Ford front output shaft itself. This output shaft configuration is the same as the rear of the NP203 and NP205, so the yokes interchange. You can get about any driveshaft connection you can imagine for this output configuration. And with the 32 spline, you're basically guaranteed it's not going to break. If you have a 30 spline front output already, it's probably not worth swapping the 32 spline shaft in unless you need the yoke options.
    Be aware, we have heard that there are some rear bearing cover differences that you could run into when swapping the 32 spline front output.

    Taken from click here
  3. drivelineman

    drivelineman 1/2 ton status

    Aug 23, 2000
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    i have as special going on the 205 32 spline output and 1350 c/v if your looking at upgrading- or you can run the 1310 c/v and such -Jess

    <a target="_blank" href=></a>
  4. Ryeguy

    Ryeguy 1/2 ton status

    Oct 30, 2000
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    Victoria, B.C.
    Hm. Just FYI, I used a front output yoke off an aluminum Ford Borg Warner T-case on my Ford NP205 (32 spline front output). Had to modify the yoke slightly, but let me use the large Ford 1-ton CV.


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