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Driveline vibrations(205swap?)

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by outlaw612, Oct 10, 2001.

  1. outlaw612

    outlaw612 1/2 ton status

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    I did a 4" lift with thee back being a shackle flip. I have a major vibration. I looked into a CV shaft, but was told by High angle(Jesse) and another shop that the only CV availible for the 208 is a Caddy CV which is unreliable. Im thinking of going to a 205 t-case. Can someone give me some info on what would be required to do this swap. I have a th350 and found a 205 w/ adapter for a th350 but Im not sure of the year.(Maybe mid 70's?) Would this be the same spline cout?IE would the trans and t-case fit without new shafts? Any info is apprciated.

    BTW, anyone with a output shaft(rear) from a 208 Im looking for a couple to try and design my own bolt on yoke. It doesnt need to be a good shaft, just need a couple to try this with.

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  2. outlaw612

    outlaw612 1/2 ton status

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    top


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  3. CaptCrunch

    CaptCrunch 1/2 ton status

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    Well I have been and still are where you are at. I currently have a 208 and am debating a swap to a fixed yoke. I will say I have a Tom Wood's custom CV w/ a slip yoke and it has been great. I'd just really like the ability to pull of the driveshaft and drive home in 4wd since there isn't a good place to wheel with'n about 75 miles of me.

    Easiest would be to find a 241 and get the fixed yoke kit for it. It should bolt right in no hassles. Going to a 205, you would have to get an adapter... change the tailshaft on the tranny (assuming you have a 700) and then modify the linkage and shifter to go through the stock tcase lever hole. That and you lose the super low range. If you go 205 I would try and get a th350 and 205 setup and hopefully it shoul bolt up w/ minor hassles.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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  4. ftn96

    ftn96 1/2 ton status

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    Ok, outlaw.... on the shackle flips you have to re-angle the rear end down so that the angle match the u-joint at the front of the driveshaft. You can do this with shims or cut and re-welding the perches.
    Remember the shackle you have to angle the pinion down for correction, and on lift spring pack you put the shim in so that it angles the rear end up.
    Good luck.

    Surgeon General's Warning:
    Viagra and steroids may be harmful to your spouse![​IMG]
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  5. 4xmac

    4xmac Registered Member

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    Well it sounds like your in luck. Your th350 will have a 27 spline outputt shaft. Know, you say you bought a 205 with adapter from a th350?. If that is correct it should have a 27 spline front inputt shaft. All you need is the couppling that goes from the trany to the T-case, cross member that is flat all the way across that is from a 205, and shifter and linkage from a 205. The shifter from a 208 t-case will not work. It will be an easy swap for you. I did this same swap using a 700r4. I was a little more involved. Any more questions let me know.

    MAC
     
  6. ftn96

    ftn96 1/2 ton status

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    That swap is still not going to fix your angle issues and thus will not get rid of your vibration problem.
    You will vibrate till you correct your angles.
    Even if you are wanting a CV shaft, you are going to have to correct your rear angle anyway. With the CV shaft your rear working angle has to be 1 or 2 degree, almost dead on straight.
    So you need to get yourself a magnetic angle finder from Snap-on or Harbor freight and figurre out how bad your angles are off.

    Surgeon General's Warning:
    Viagra and steroids may be harmful to your spouse![​IMG]
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  7. outlaw612

    outlaw612 1/2 ton status

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    The rear angle is almost straight, I was told the way it sits now with a t-case with a bolt on yoke it would be ideal for a CV setup. What is the low range for the 205 t-case?

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  8. kpanza

    kpanza 1/2 ton status

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    Low range on a 205 is a pathetic 1.96:1...you will definitely miss your 208's 2.61:1 low!!!
     
  9. th350s that had 208s have a long output shaft. the ones for 203s and 205s have a short output shaft. shim your pinion down and you should be good.

    <font color=blue> Experience enables you to recognize a mistake when you make it again.

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  10. ftn96

    ftn96 1/2 ton status

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    Well I will back up then and say that I agree with Captcrunch as the 208 and 241's are so simular that swaping to a 241 adn getting a fixed yoke kit would be the deal for you. I just did the fixed yoke install on my 241 adn got the CV shaft from Jesse adn it KICKS ASS. I dont know how fast I was going but the speedo is off and it was barried and it rode better than my mothers Escalade! [​IMG] She was not impressed!!![​IMG]

    Surgeon General's Warning:
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  11. outlaw612

    outlaw612 1/2 ton status

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    What did the 241 come in(newer full size chevys?) How does the low range compare to the 208? How much for the bolt on kit for the 241? I talked to Tom Woods today and he told me $325 for the Caddy CV, but Im with the captain, it would be nice to be able to pull the shaft and drive home on the front.

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  12. ftn96

    ftn96 1/2 ton status

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    Can someone else help him here with the low range specs on the 241 compared to the 208? I know the 241 is like the lowest or close to it.
    The short shaft (fixed yoke) kit for the 241 is $300 without the yoke. You wont need the yoke if your getting a CV shaft.
    You'll have to get a CV flange for the CV shaft and Jesse carries those as well. Last time I called him he was on back order on the fixed yoke kit.

    Surgeon General's Warning:
    Viagra and steroids may be harmful to your spouse![​IMG]
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  13. 4xmac

    4xmac Registered Member

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    Well I guess after putting a rock thru my 208, I had enough of that. I haven"t missed the lower range of the 208 at all. Going with the 205 that I know is just about bomb proof is the way I needed to go . when your running a D60/14ff with 1350 cv"s and 38"s it doesn"t make sence to go with anything less. Now my 700r4 would normally not be able to stand the punishment of 38s , but it"s an Art Carr trans. So far so good. But not everyone needs all of this. Just my opinion thoe.

    MAC
     
  14. outlaw612

    outlaw612 1/2 ton status

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    Thanks for all your help. I havent decided which way im gonna go yet but everyone has been extremely helpful. Thakns again.

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  15. K5RON

    K5RON 1/2 ton status

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    Recently did a 14BFF swap and w/ the 208, the vibes were extreme but.....with the 205 and a cv driveshaft, I have no noticeable vibes!

    PS I do have a 2 1/2" shackle flip which puts the pinion about 2 degrees below dead on!


    Ron


    '84 K5......Tree Fitty, SM465/Np205, D44/14BFF, Pro-jection! .....and of coarse no other color than Odie!
     

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