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New K3500 Dually Crew Cab, what T Case and Rear?

Discussion in 'The Garage' started by bigblock454, Sep 10, 2003.

  1. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    I just bought a new K3500 Dually Crew Cab 454. I thought it would have a 14FF but it doesn't, is it a Dana 80, does it have a NP205(it is cast iron)?
     
  2. SUBFAN

    SUBFAN 1/2 ton status

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    Clean the housing around the center section, particularly around the pass. side lower. Look for a 70 or 80, I think it will be a 70.
     
  3. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> If it's the 88 listed in your sig, it should have the Dana 70 and I beleive a 205. If it's a NEW new one then it will have the 11.5" 14 bolt and probably some high-zoot transfer case with lots of bells and whistles that would cost a bajillion dollars to replace. </font>
     
  4. thatK30guy

    thatK30guy 1 ton status Premium Member

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    [ QUOTE ]
    I just bought a new K3500 Dually Crew Cab 454. I thought it would have a 14FF but it doesn't, is it a Dana 80, does it have a NP205(it is cast iron)?

    [/ QUOTE ]

    What year is this truck?
     
  5. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    Sorry guys, it is a 1988. The one in my sig.
     
  6. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    If it's a pick up (not a cab&amp;chassis) then the rear axle will definitely be a D70HD. If the case is iron then it's a 205, no doubt. /forums/images/graemlins/thumb.gif
     
  7. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Ok, if its a crew dually, it will be a V30, not K, and the rear will be a D70 as these are standard dually rears for the fleetsides whereas the cab-&amp;-chassis models will have the narrower 14FF dually rear.

    Just think of it this way: any GM 1 ton dually that came with a regular bed (with the wider fenders) will almost ALWAYS have a D70 and those with no beds or if they have utility beds, flat beds, etc, they will likely have the 14FF.
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    So with all that said, what dictated which t-case the truck got?

    The '91 I pulled my transfercase from was obviously a 205, but I believe 241's were also installed in one tons that late?

    Engine size?
     
  9. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    Based on the fact that I've never seen otherwise, I believe all *crew cabs* came with 205's. I know the reg cab trucks (81-87) can have either 205 or 208 but I've never seen a crew cab with anything else (except, of course, the pre-80 full time trucks with a 203).
     
  10. thatK30guy

    thatK30guy 1 ton status Premium Member

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    All the V-series 1 tons got the 205 t-case, like the K-series.

    This '88 V30 will have a 205 also. Since its a crew cab, the rear output on the 205 will be a fixed yoke. Regular cab 1 tons have slip yokes.

    241's, and 208's, were available standard on the K and V-series in the 10's and 20's but only the 208 was available for the 1 ton in the M-series trucks.
     
  11. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    I have a friend with a 95 crew cab dually( not the cab&amp;chassi) and it has a 14boltFF instead of the D70. Is this odd?

    -------------------
    85K5 3/4ton,14boltFF,10bolt,9"lift,35"boggers,16.5x14welds, big horse 406SBC/700R-4 /forums/images/graemlins/k5.gif /forums/images/graemlins/angryfire.gif
     
  12. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> It's not odd on the later body style trucks. </font>
     
  13. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Oh, thats what I figured
     
  14. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    Yep, I found HD70 cast into the rear last night. How does this compare to a 14FF in strength?

    It is a Crew Cab 3+3.
     
  15. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    Both axles have 10.5" ring gears and 1.5" axles. The D70HD housing is stronger due to the larger axle tubes and more webbing on the center section, the carrier and inner pinion bearings are considerably larger than the 14 bolt counterparts.

    Realistically, either axle will do anything the truck itself is capable of but ultimately I'd have to give the Dana the win.
     
  16. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    How about the outer hub bearings? Is the Dana larger?
     
  17. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    No, the wheel bearings are the same as a 14 bolt. In fact, U2Slow pointed out that dually 14 bolt hubs will interchange with the D70HD.
     
  18. thatK30guy

    thatK30guy 1 ton status Premium Member

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    [ QUOTE ]
    Both axles have 10.5" ring gears

    [/ QUOTE ]

    Actually, I've found out thru various info that the D70's ring gear is 10.54" which gives it that .04" advantage over the 14FF. /forums/images/graemlins/thumb.gif
     

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