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700R4 vent hose

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 88sub4x4, May 11, 2004.

  1. 88sub4x4

    88sub4x4 1/2 ton status

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    Does a 700r4 have a vent hose? I was looking at my truck last night, 88 sub 4x4, and it looked like an elbow for a vent hose at the top of the case, but I couldn't see too well. The trans was replaced in Feb. by GM so maybe they forgot to put it back on? I couldn't find any loose hoses hanging anywhere though. Thanks in advance
     
  2. BlazerGuy

    BlazerGuy 3/4 ton status

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    Nah, no tranny that I know of came with a vent hose. Just get some vacuum line go to town! /forums/images/graemlins/tongue.gif
     
  3. 88sub4x4

    88sub4x4 1/2 ton status

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    Thanks, thats what i figured i'd have to do.
     
  4. BAJA_BLAZER

    BAJA_BLAZER 1/2 ton status Author

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    They have a small plastic (they often break off) vent tube at the top facing backwards just behind the bellhousing. You can see it in this picture.

    [​IMG]
     
  5. 88sub4x4

    88sub4x4 1/2 ton status

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    Thats exactly where i saw it, but this was metal.
     
  6. Derf00

    Derf00 1/2 ton status

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    As stated, they do have small plastic vents from the factory, but some rebuilders replace them with metal. When I had my 700R4 rebuilt, I had it replaced with a metal one.
     
  7. cybrfire

    cybrfire 1 ton status Vendor GMOTM Winner

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    If you ever have your trans apart far enough you can pull out the metal or plastic that is there and tap it for an 1/4" pipe thread and throw a barb in there for a rubber vent tube which of course can be run up nice and high. There is plenty of meat there to tap NPT threads in.
     

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