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Anybody have floor to t-case interference?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by pcorssmit, Oct 22, 2001.

  1. pcorssmit

    pcorssmit 1/2 ton status

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    My brother recently broke the adapter between his TH 350 and NP 205. We had a few theories as to why it broke, but realized upon reinstalling the t-case tonight that the stiffening rib on the cab floor pan was resting on the top of the t-case with a good deal of force. Near as we can figure this is what caused the adapter to break (it cracked along the top). We looked at the body, frame, and cross member, but couldn't see anything severly tweaked, but being a 32 year old truck, most everything was tweaked a little. The Body mounts are about 3 years old and in good shape. The body rib that is touching is the same one that the front of the seats bolt to, which doesn't help (my brothers a pretty big guy). Just wondering if this is a common problem, or if his truck is a bigger POS than we though. I think for now he is just going to lower the transfer case 3/4" or so, he eventually wants to do a TH 700 w/a doubler.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  2. SilverJim

    SilverJim 1/2 ton status

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    My '70 Jimmy came with a Dana 20 transfer case and when I swapped to an NP205, the t-case hit exactly where you said when I tried to put the body back on the truck...my solution: 3" body lift.

    1970 GMC Jimmy 502HO/SM465/NP205 doesn't run just yet!
     
  3. Blazer1970

    Blazer1970 1/2 ton status

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    There are cross members with different drops. My Blazer came with a 3 speed / Dana 20, and I swapped the entire drivetrain from a '72 Blazer with an SM465 / NP205. When I went to install the 205, I tried to use the old cross member, and the case hit the floor pan as you have described. I went and got the cross member from the '72, and it had about 1" more drop than the one from my '70.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  4. pcorssmit

    pcorssmit 1/2 ton status

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    Think you could measure the drop in your cross member for me if you get a chance? Maybe from the bottom of the frame rail to the bottom of the cross member (vertical distance), or what ever else is easy? I always assumed this is an original 350/205 truck (1970), but now you've got me wondering. When I get home I may try and look up the vin #.

    Thanks,

    Pete


    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  5. harry

    harry 1/2 ton status

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    I agree with blazer70. I am using two cross members and one of them hangs down one inch lower than the other. I just used 1" steel blocks to space down the shallow one.

    harry
    69k5
     
  6. frito

    frito Registered Member

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    yeah they must be right about the cross memebers being differient cuz i have a 71 blazer with a 205 and it donst hit
    i measured my TC X-member it drops almost 5 1/2 inches from the bottom of the trucks frame (its the lowest part under my truck and i hit it the most wheelin but i only have a 2 1/2 inch lift with 35's )
     
  7. pcorssmit

    pcorssmit 1/2 ton status

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    Thanks. Will measure my brother's when I get home tonight.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  8. pcorssmit

    pcorssmit 1/2 ton status

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    Well, his is right about 5". Not sure which one he has now.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  9. Blazer1970

    Blazer1970 1/2 ton status

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    Sorry, I was going to measure mine, but I forgot (no surpirse there). Will try to remember if you are still interested.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  10. pcorssmit

    pcorssmit 1/2 ton status

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    OK, would still like to know. Thanx.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  11. hirider34

    hirider34 Registered Member

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    I'll measure mine when I get a chance this weekend. '71 205/350. I'm also planning on ditching the auto for an sm465 I picked up the other day. If you wanted the cross member it could probably be arranged.

    Why buy it if you can build it better?
    All Give Some. Some gave all. God bless the fallen Brothers in the FDNY.
     

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