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Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by roostr3269, Aug 26, 2001.

  1. roostr3269

    roostr3269 1/2 ton status

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    i have a '72 jimmy 350/350 np205, 12 bolt in rear and d44 up front. all im putting money into now is drivetrain. right now i am thinking about going with a ram jet 350, with 4l80e tranny. what im not sure is will the stock axles hold up, or should i replace with 3/4 or 1 ton axles? any1 with some feedback or experience with this, please let me know what u think. i will be ordering motor and tranny within a week or so. lookin for all around trail vehicle able to travel on road if i need to. thanx roostr32

    live to wheel, wheel to live
     
  2. Triaged

    Triaged 1/2 ton status

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    Well because I just broke mine I would say to upgrade the axles. At the very least replace the front axle shafts with 73- shafts because they use larger u-joints than our 1st Gens came with.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     
  3. Roostr84

    Roostr84 1/2 ton status

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    I believe there was a discussion on the ramjet before. While it is a pretty cool setup one problem i mentioned was the lack of o2 sensor to give real world feedback to the computer. Thus I dont think it runs closed loop. Just something to consider before dumping all that money into one.

    Chris =)

    I think the exhaust fumes have finally gotten to me!!
     
  4. Klef72K5

    Klef72K5 1/2 ton status

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    My buddy just put a Ram Jet in his CJ7. It did very well in climbing the sand dunes in Michigan. No hesitation! Anyways, he's got the original Amc 20 model in the rear(ring gear is a little thicker than the Dana 44) and he has the Dana 30 model up front and has had no problems yet!
    As for the O2 sensor he put it in and seems to be running great! The only thing I don't care for is that it's only a 2 bolt main. I like to twist high RPM's!

    <a target="_blank" href=http://wsphotofews.excite.com/031/rw/Jo/og/t488200.jpg>http://wsphotofews.excite.com/031/rw/Jo/og/t488200.jpg</a>
     
  5. roostr3269

    roostr3269 1/2 ton status

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    thanks for the input, i will keep u guys posted on what happens roostr

    live to wheel, wheel to live
     
  6. JST12

    JST12 1/2 ton status

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    A few of us put in the ZZ4 350. It has 355 HP out of the crate and with a cam kit , it goes to 394. If you opt for the fast-burn heads, it will put out 430 HP and 430 ft/lbs. It is a sweet, lightweight motor. JT
     
  7. 1HIHUM

    1HIHUM 1/2 ton status

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    JST, are you sure about the torque on those fast burn heads? When I bought mine, the torque with those heads was only like 350 lbs, with the horse power around 430. I have to say I'm pretty happy with mine. Rooster, definately upgrade the axles! I blew two 12 bolts... on the street, before I went to a 14 bolt. And that was with a stock 350.

    [image]http://albums.photopoint.com/j/View?u=1328774&a=9975627&p=33244094[/image]
     
  8. JST12

    JST12 1/2 ton status

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    HIHUM, yep I'm sure about the numbers. The standard zz4 is rated at 404 ft/lbs. The ZZ430 limited production engine is the same short block with the cam kit and fast burn heads. It is advertised at 430hp and 430 ft lbs. The dealerships do these two mods to the zz4 and sell them as a replica of the zz430. Hope this makes sense. JT
     

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