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Will a '71 14bff rear bolt into a 85 k-10..

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TJS, Mar 18, 2003.

  1. TJS

    TJS 1/2 ton status

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    Will a \'71 14bff rear bolt into a 85 k-10..

    I have been doing a lot of searches on this site about
    the 14bff and "fitability". Will I have any problems bolting this in such as spring perch issues. It is NOT from a dualie either. He also has the Dana 44 8 lug axle for the front and will throw in the wheels and the driveshafts. However the ratio is 4:56. To me this seems a little steep, but I do snowplow with the truck. My gas mileage is poor already. What do you think. Also I read the article about the brake cable issue and that looks like a simple fix.
    I have a nice MIG 240, plasma cutter, lathe and a Bridgeport Machine so making some parts is no big deal. Thanks in advance.
    T.J.
     
  2. Beast388

    Beast388 1/2 ton status

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    What year exactly are the 14BFF & D44? The first year for the 14BFF was 1973.
     
  3. Hossbaby50

    Hossbaby50 3/4 ton status

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    As far as I can remeber, then didn't come out with the 14bff until 73ish I think. If it is a 71 axle it is probably the Eaton axle that Chevy used before the 14bff.

    As for the 4.56's. If you don't run big tires and don't have OD it might be to much for a DD. But if you only plow or don't drive the truck alot then 4.56's would be great. My buddy runs 4.56's with 35's with no OD and he turns 3000RPM at 65MPH so his mileage isn't great. Highway cruising is something he tries to avoid.
     
  4. TJS

    TJS 1/2 ton status

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    His add says 71. I think I am going to look at it tomorrow and take some measurements.
     
  5. R72K5

    R72K5 Banned

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    67-72 trucks also had 40" and 42.5" centers depending on model of truck, blazers were 40" back then 69-72 4x4 as were all 4x4 models and all 1 tons and all longhorns, but 2wd 1/2 and 3/4 ton were 42.5"

    73-up changed this for a few models of course
     
  6. Blazer1970

    Blazer1970 1/2 ton status

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    A '71 3/4 ton could have either a Dana 60 or an Eaton rear axle.
     
  7. MJF

    MJF 1/2 ton status

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    The eaton has a removable center section like the ford 9" rears. Just to help you identify it.
     
  8. R72K5

    R72K5 Banned

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    and the old eaton axles had perfectly round salad bowl deep dish diff cover with a drain plug in it
     
  9. TJS

    TJS 1/2 ton status

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    Thanks for all the responses. Where exactly to I measure from what point to what point. I am going to call the person selling the diff's and ask him to measure. But I do not know what to tell him to measure. I guess I could tell him to measure from one end of the spring perch to another.
    He also swears it is a 14bff rear. Oh and yes I have an OD trans. a fesh well sorta 700r4.
     
  10. Silver84k5

    Silver84k5 1/2 ton status

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    since its out of such an old truck, a 14ff coulda just been swapped in there, and the guy selling it thinks it was stock, either way, i would measure from where the Center pin ggoes into the spring perch, to the other center pin.
     
  11. R72K5

    R72K5 Banned

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    if the 71 is a 2wd and not a longhorn and not a 1 ton then its 42.5" center, you should tell us what the truck is or give us the model code off the SPID label on the glovebox door, model code is the first code listed in the options list left hand side column, it is not the same as the VIN codem id rather know what the model code is so we know what the truck left the factory as, 67-72 are my specialty, ive been researching them for years and have owned alot of them
     
  12. TJS

    TJS 1/2 ton status

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    Thanks for telling me where to measure. What is my center on my truck. 85 K-10. Thanks again for all the information.
    T.J.
     
  13. R72K5

    R72K5 Banned

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    Re: Will a \'71 14bff rear bolt into a 85 k-10..

    73-up 4x4 trucks are 42.5"
    its a k10 right ?
    if the 71 is a 2wd then its same
     

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