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Can you run a Dana-300 on a Blazer ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by smp, Apr 8, 2001.

  1. smp

    smp 1/2 ton status

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    I was at the local salvage yard helping a friend pull a d-300 for his jeep when i looked over at the tranny and noticed that it was a th-400 and had an adapter between the bellhousing and the engine (a 360) and later was wondering if i could bolt the th-400 and d-300 up to the blazer cause they make a 4to1 low gears for this t-case. Whatcha think? How strong is a dana-300?


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  2. '73 K5

    '73 K5 1/2 ton status

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    Dana 44's can take tons of abuse in Jeeps because Jeeps weigh nothing. In a heavy Blazer, a Dana 44 wouldn't last as long. Same way with the Dana 300. It'll look like a champ in a Jeep and hardly ever break, but it wouldn't be the same way with a Blazer...just too much truck for it.

    '73 K5
    Chevy good...Ford bad
     
  3. smp

    smp 1/2 ton status

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    Thats what i was thinking but we saw this in a 73 Wagoner with a V8 and it is by no means a small vehicle so it has me wondering.


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  4. EDdaTREE

    EDdaTREE 1/2 ton status

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    Naaaah....SCREW that small stuff and stick wit da heavy iron...203's and 205's for the big meat'

    "Why YES!..the Fast-lane was built just for YOU!! Because we all needed someone to drive slow and screw up traffic!!!!"
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The May Peterson's had an article on the Dana 300, it shows the tiny little 1 1/8" output shaft.....Snap!
    Apparently Advance Adaptors is now making a beefy 1 3/8 32 spline output for it now $$$.
    I don't know how the rest would hold up though. Check it out, page 48

    Rene

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  6. smp

    smp 1/2 ton status

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    I was looking at them and they are cast iron case and have all gears. It is a small t-case but we found it behind a th-400 so wouldn't it have 32 spline input ?


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  7. Brady

    Brady 1/2 ton status

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    hey SMP That motor you sold me ended up needing everything.I am not too happy but I should have pulled it apart before buying it.Turns out it was rebuilt before.The heads were milled and the bearings were shot.Luckily the crank is good it was also turned already.So anyway your friend is not so trustworthy.Brady

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  8. MTPockets

    MTPockets 1/2 ton status

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    SMP,
    i saw an article in a JP magazine on a ring they make so you can clock the 300 t-case to gain more belly clearance. i like the sound of that, as well as the 4-1 gearing.
    anyone know more about using this t-case?
    MTPockets
     
  9. smp

    smp 1/2 ton status

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    Damn Brady that sucks,this is why i hate selling things like engines, trannies, and axles without first having driven them or tearing them apart I'm sorry about that but i hope you can still get enough out of it to make it worth your while.

    MTPockets that does sound pretty sweet it would be nice to get more belly clearnce i think i am going to talk to some jeepers and find out how much abuse these t-cases can handle.


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  10. That isn't a dana 300 t-case in a 73 waggy,they have t 400 with d 20 cases.Some one could have put it in but it did'nt come stock behind a t 400.They were only used in cj's from 82 to 86,great for a jeep but not a ful size.
     
  11. MTPockets

    MTPockets 1/2 ton status

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    so whats up with the d-20?
    what years did they come in GM trucks?
    all gear, iron case, any 4-1 kits?
     
  12. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    If I remember right they came in 69 Blazers.

    Jim '80 GMC
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  13. Blazer1970

    Blazer1970 1/2 ton status

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    The Dana 20 came in some Blazers from '69 to '72, and even some '73s that I have heard of. It has a 2:1 low range. There are low gear sets made for Bronco model 20s, but I am not sure if they work in the GM model. Might as well use an NP205. I threw the Dana 20 that was originally in my Blazer away.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
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  14. smp

    smp 1/2 ton status

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    Ok i found some good info from another 4x4 site :
    Ok ALL 1980 IH Scout II's have / had the D300. Two versions. Behind the manual(s) (T-18 or T-19) was a 6 spline bullgear, behind the 727 (auto) was a 23 spline bullgear. Other than the different bullgear the Scout cases are interchangable. The Scout D300 has the "texas" bolt patern. Same as a D18 or D20. The IH D300 will bolt into any 79 and older CJ IF it is equiped with a transmission with a 6 spline output shaft, i.e. T-18. Sorry no three speeds they have a 10 spline output. Can't get the gear for those. You can identify the 300 from a 20 by the aluminum output shaft housing front/rear. The 20's are all cast iron. There are a few possibilities for "custom swapping" One find a 6 spline output for a 3 speed, (why?), or run a 727 auto from a '82 newer waggy with the scout tail housing and output shaft. (takes two trannies to make one). The manual version is upgradable to 4:1 only. Expect to pay in the $500-$750 range. Yes Ethel that's not a typo. They are extremely rare. IH went out of business in 80, so there was only about 16,000 Scout's made in 80. And most of the IH guys have sucked up all the extra's, and, most will not part with one. The auto version is the cheaper of the two, all you have to do is swap the bullgear, but no one will seel you just the gear. You'll have to buy the whole case. (been there, done that)

    The Jeep D300's have two versions. 80' and 81-86. The early cases have an output shaft that is approx an inch shorter than the late.
    Again you can identify a Jeep 300 by the aluminum output shaft housings. The Jeep case has a 23 spline input shaft and a round 6 bolt pattern. Same as a NP208, 231, 241, etc. Both cases are upgradable to 4:1 and the AA 32 spline output. With the big output you can only get the long style. These case were used in all CJ model's from 80-86. There are adapters out there to swap it in behind anything. Expect to pay $350-$500 for the short output case, again these are rare. Expect $200-$250 for the late model case.

    All three variations are excellent transfer cases. Good for 300+ HP all day. I run an IH version behind my big block. No Problems. Almost all of the Binder Bunch use this case behind everything from an IH 345 to a big inch HEMI.

    Here is a link to the forum :http://WWW.SMP.COLORADOK5.COM
     

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