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t case lowering

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by shaggyk5, Mar 2, 2000.

  1. shaggyk5

    shaggyk5 1/2 ton status

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    i was told that for a four inch lift you should lower the transfer case to provide a better angle for the driveshafts. My questions: how? how far? is this neccessary? how can the t case be lowered independantly of the trans? i have a funny feeling its not as complicated as i am making it in my mind, but i want to double check! thanx in advance!

    shaggyk5

    aint nuthin in the world like a heavy chevy!
     
  2. Texan

    Texan 1/2 ton status

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    Your trans. basically hangs between the t-case and engine so when you "lower" the t-case you are really pivoting the entire engine/trans/t-case package at the motor mounts....

    Hope That Helps,

    <font color=orange>STEVE<font color=orange>[​IMG]
    89 Blazer
    67 Camaro 468
    68 CamaroSS 327
    98 GTP
     
  3. Waxer

    Waxer 1/2 ton status Author

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    With my 4" lift, my tcase isnt lowered at all. I have no driveline vibrations at all. I dont have shims on the axle's either. Guess I just got lucky.

    Also, if you do lower your tcase and dont have a body lift, you run the chance of your dist hitting the firewall. So be careful.
     
  4. Brian 89KBlazer

    Brian 89KBlazer 1/2 ton status

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    If you can get the angles between your driveshaft/axle pinion to be equal to the angle between the driveshaft/t-case yoke and these angles do NOT exceed the allowable angles of the u-joints you are running, you should not need to lower your t-case and should not experience any driveline vibration. If this doesn't work, another option is to have a CV-jointed driveshaft built and have the rear pinion rotated up to be inline with the shaft so that you wouldn't need to shim or lower the t-case.

    Good Luck
    Brian
    Still in search of the TBI KING
     
  5. shaggyk5

    shaggyk5 1/2 ton status

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    how would i go about lowering it if i did need to?

    shaggyk5

    aint nuthin in the world like a heavy chevy!!
     
  6. OneInTheSun

    OneInTheSun 1/2 ton status

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    For some reason, Chevy used spacers when they bolted the t-case to the frame. Just move those spacers (I think they're 1/2 - 3/4") between the t-case crossmember and frame. I had some serious vibration after I put on a 4" Superlift lift. Lowering the t-case helped tremendously. The u-joint angles are still a few degrees off, so I'll be replacing the shim that came with the rear springs with shims that even everything out. Seems like some people have this problem and others don't - guess it depends on the brand of the lift.

    <font color=blue>Rob
    85 K5</font color=blue>
    [​IMG] 24 beers in a case, 24 hours in a day - Coincidence?
     
  7. kim tate

    kim tate 1/2 ton status

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    Spacers?

    Please help clear this up for me. Do the spacers (stock K5) go between the crossmember and the frame?
     
  8. Crash90K5

    Crash90K5 Registered Member

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    Re: Spacers?

    Nope, for the stock setup it goes frame -> cross member -> spacers -> nuts. To "lower" the t-case, flip the spacers to go between frame and cross member.

    [​IMG] <font color=blue>Crash90K5</font color=blue> [​IMG]
     
  9. BIGJ

    BIGJ 1/2 ton status Author

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    Re: Spacers?

    Crash is right. I had the same problems with driveline vibrations when I put a 4-inch lift on my rig. Did the exact same thing with the spacers and it helped out a bunch. It sure does beat going out and buying a set of spacers.

    BIGJ
     
  10. Mr Red

    Mr Red 1/2 ton status

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    Get this. The guy I bought my rig from had it lifted (4"). They used a bunch of washers, just under 3/4" b/t frame and t-case mount. Looks like sh*% rig but I got zero vibration. As I get older, I'm lear'n not to question things like this that work!

    <font color=red>David, '86 K5</font color=red>
     
  11. drifter

    drifter Registered Member

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    I put a 4" pro-comp on my 79 and had bad vibrations. I called the place where i bought the kit and they told me to move the spacers like Crash & Bigj did, it worked no more vibrations! [​IMG] Life is grand in k-5 land [​IMG]
     
  12. shaggyk5

    shaggyk5 1/2 ton status

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    thanks everyone!!
    shaggyk5

    aint nuthin in the world like a heavy chevy!!
     
  13. Blazer79

    Blazer79 1/2 ton status

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    How much lowering?

    How much did you guys lower the transfer case to make the vibrations dissappear?

    Just gettting smarter for the day I decide on a lift kit.

    <font color=purple>////////
    Go 79s!!!
    </font color=purple>[​IMG]
     
  14. drifter

    drifter Registered Member

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    Re: How much lowering?

    Blazer 79, about 3/4" to 1" worked on mine
     

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