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rear driveshaft angles... help!!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Truckfan2, Apr 3, 2001.

  1. Truckfan2

    Truckfan2 1/2 ton status

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    How should my rear angles be set up so that I have no vibrations? Right now it vibrates around 45 mph crusing... if i step on it the vib goes though... I have a 6" lift and 35s. Help, this is really bugging me. Thanks


    Other info- 350 / TH700r4 / NP241 with Slip yoke / 14 bolt rear end / 6" shackle flip

    Have been stuck (once) as of 8/12/00
     
  2. jerseyk5

    jerseyk5 Registered Member

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    Do you have your transfercase dropped down? Also, I have a 6 inch lift and had vibrations but I had one of those driveshafts made up with the cv joint in it. NO VIBRATIONS what so ever. Almost as smooth as the wife acura.
     
  3. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    I have a 6" lift and the t-case is dropped. That would be my first suggestion in ending the vibration.....or have a driveshaft with a cv joint....since it's vibrating now, once you solve the problem, check your joints to make sure they weren't damaged from the vibrations...my joint got thrashed with just a small amount of vibe...

    "I love the sound rice burners make when ya run over them"
    Suck fumes Ford Boy!!
     
  4. Truckfan2

    Truckfan2 1/2 ton status

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    my t-case is dropped and the driveshaft coming out of the slip yoke is almost straight and the angle isn't bad at the differential... I'd like to get it close to stock if possible. Also I thought that the angles were supposed to be the same at each end... anyone know what they're supposed to be and the margin of error/difference I can have?

    Have been stuck (once) as of 8/12/00
     
  5. WhiteWhomper

    WhiteWhomper 1/2 ton status

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    I have heard that the rear pinon should be about 2 degrees downward from the angle at the slip yoke. This is due to when torque is applied, the pinion will try to rotate upwards. This is why you probably lessen the vibration when you apply the gas. If you have the case dropped, a couple of 2-4 degree shims may be all that you need. The shims are definately alot cheaper than a CV driveshaft...not as cool though.
     
  6. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Where can one find one of these 'CV' style driveshafts? They sound appealing... also, I am about to install my driveline into a rolling chassis with a 6" lift. I have a TH350 and a NP205 xfer. Everyone keeps mentioning 'dropping' the transfer case? How or what do I have to do to accomplish this?

    <font color=red> Check out my rig @ </font color=red>
    <A target="_blank" HREF=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</A> [​IMG]
    <font color=red> I Love My Blazer! </font color=red>
     
  7. Truckfan2

    Truckfan2 1/2 ton status

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    The transmission crossmember has four bolts securing it to the frame rails. From the factory there are 1" spacers that can be utilized by putting them between the bottom of the frame and the x-member (x-member goes from against the frame to 1" nearer to the ground) thus "dropping" the t-case.

    Have been stuck (once) as of 8/12/00
     
  8. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    How many one inch spacers should I expect to use? And where can I purchase them? Thanks.

    <font color=red> Check out my rig @ </font color=red>
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  9. 73CowBlazer

    73CowBlazer Registered Member

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    Krazie87k5 Did you ever get an answer to the question about spacers? I am going to do a 6" lift on my 73 and need the same answers
     
  10. ftn96

    ftn96 1/2 ton status

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    The spacers are or should already be on the truck. And you should only have to use one per bolt.

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  11. lehtola

    lehtola 1/2 ton status

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    I'm having some vibs with my 4". What do I need to do to take those spacers out and put them on top? Do I need to use a jack or what?

    1990 GMC Jimmy 350/TH700R4/NP241/10 bolts, 4" skyjacker lift, 35x12.50R15 BFG All Terrains on 15x10 AR Baja's, Flowmasters.
     
  12. ftn96

    ftn96 1/2 ton status

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    That is the cheapest thing you can try. Its free. And yes, you need to put a jack under the crossmember to support it, then take the nuts off, then lower the jack slowly till you can get the spacer in between the frame and the crossmember, then tighten them back up. Best to do one side at a time. Then drive it around the block and see what you got.

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  13. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Yes. The spacers are just 1" spacers which are placed between the frame and the cross member to effectively lower the xfer case and transmission angle toward the rear axle. Good Luck! I think 6" can be a little much in the way of lifts, be sure that a 4" would not work before going all the way to 6". There is a BIG difference.

    <font color=red> Check out my rig @ </font color=red>
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  14. Triaged

    Triaged 1/2 ton status

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    Just to add to what WhiteWhomper said, if you have a CV driveshaft the angle at the rear pinion only needs to be 2deg. total from pinion to driveshaft. But if you don't have a CV than it is just as WhiteWhomper said.

    '71 Blazer CST with alot of rust
     

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