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700r4 Mated to a Dana 300?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Corey-88K5, Feb 21, 2001.

  1. Corey-88K5

    Corey-88K5 1/2 ton status

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    Does anybody know how many or if the 700r4 has a 23 spline output shaft? There is a shop near me that does a twin stick Dana 300 that can have a 400:1 (aprox) crawl ratio. I can get this case for about $700ish with the shifters. Plus its about 1/2 the side of the 208 w/fixed yoke on the back. All together its about 1' from drive shaft yoke to drive shaft yoke, the actual case is about 8". I was looking at this, and its BAD ASS!!!!! The shop that designed this also sells the Atlas, and it seems that Advance adapters is on the verge of yanking their product from these people because they are selling a product that is about equal in strength, smaller, lighter, and MUCH MORE ECONOMICAL.

    Corey
    88K5


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  2. Blazer1970

    Blazer1970 1/2 ton status

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    I thought all 700R4s were 27 spline. It seems like there must be readily available parts to connect the Dana 300 to the 700R4, as the GM automatic is a common swap into Jeeps. Do you have to swap the output shaft in the tranny?

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
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  3. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Do you mean 4:1 instead of 400:1??
     
  4. Emmettology 101

    Emmettology 101 3/4 ton status

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    I think Advance Adapters has an adapter for this..

    Mike [​IMG]
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  5. pcorssmit

    pcorssmit 1/2 ton status

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    Advance adapters sells two types of kits for a 700/300, one requires a new output, one doesn't. 700's never came w/ a 23 spline output.

    The Dana 300 is a good t-case for light vehicles such as Heeps, but is not strong enough for a full size. The internals are much smaller than the 208's. The whole thing (with a cast iron case) is lighter than a 208. There is a 4:1 gear set available, but it is not as strong as the stock 2.6:1, and the 4:1's have durability problems even in Jeeps.

    In order to get a 400:1 crawl ratio with a 700R4 (3.01:1 low) and a 4:1 Dana 300, you would need 27.8:1 axle gears.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  6. HarryH3

    HarryH3 1 ton status Author

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    This is a very popular Jeep swap. I've been helping a friend strip a rolled '88 Blazer that he bought just for this. He's taking the engine and tranny from the Blazer and installing them into a Jeep Scrambler. He has to change the output shaft in the 700r4 and use the correct adapter to mate it up with the Dana 300. His kit came from Novak, but the one from Advance Adapters looks exactly the same.

    Keep in mind that the Dana 300 is much weaker than your present t-case. It was designed to live in Jeeps and Scouts, not K5's.

    <font color=black>HarryH3 - '75 K5</font color=black>
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  7. HarryH3

    HarryH3 1 ton status Author

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    Pete, have you seen the adapter that doesn't require a new output shaft in the tranny? I'm just wondering how it works. Does it use a longer adapter and a coupler shaft? The output shaft that comes in the kit I saw last weekend is only about 6 inches long and a lot of that will be inside the 700r4.

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  8. ken

    ken 1/2 ton status

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    I believe there is a 23 spline 700r4 output shaft, it was used in the S-10 series of trucks with the 231 transfer case and 700r4 tranny. Anyway, the Dana 300 is not up to the task of a full sized truck. Ditto with the Atlas.

    ken
     
  9. pcorssmit

    pcorssmit 1/2 ton status

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    I haven't seen the adapter, its listed in the Advance catalog. Both adapters are listed as being 3.65" long, and the price diff is about $40.

    I don't see anything about a 23 spline S10 700, but I guess its possible.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     

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