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700R4 Difference ?s

Discussion in 'The Garage' started by BurbLover, Dec 9, 2003.

  1. BurbLover

    BurbLover 1/2 ton status

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    What, if any, are the differences between a 700R4 from behind a 6.2 and one from behind a 350? Can I swap the gas one in for a blown diesel one? Thanks.
     
  2. bigred81

    bigred81 1/2 ton status

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    The transmission is the same but the diesel torque convertor is made to take the torque of the diesel while the torque convertor from the gas truck will work but you run the risk of shelling out the gas torque convertor and ruin your replacement trans. Hope this will help.

    James Startz
     
  3. BurbLover

    BurbLover 1/2 ton status

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    What if I use the diesel TC from the 6.2 and put it on th replacement tranns?

    Also, my other concern was having the t0case line up properly. Someone tried to tell me the 6.2 had a different bolt up pattern than the 350's or other gas engines. Any truth to that? Thanks.
     
  4. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Nope, to my knowledge there is no difference. I pulled a 6.2 and dropped a TBI 350 right down in the same place and everything bolted up.
     
  5. Thunder

    Thunder 3/4 ton status

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    If you use the old TC from the blown tranny make sure it doesn't have any pieces or chunks, metal flakes, ECT from the old blown tranny in it. That crap will take out the new tranny in a short time. Its always best to use a new TC.
     
  6. heavy4x4

    heavy4x4 1/2 ton status

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    There is one MAJOR difference. You'll need to replace the governor in the diesel tranny with one from a gas tranny if you're putting it behind your 350. Diesel tranny governors keep shift points really low. On a gas tranny, under a full-throttle application it shouldn't upshift until you hit about 4500rpm. Diesel probably closer to 3,000rpm...but not sure on that figure.
     
  7. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    yes just the converter and the governer is different
     
  8. BurbLover

    BurbLover 1/2 ton status

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    I'm putting a gas tranny behind the 6.2. Do I still need to swap? Also, do I need to tear it apart to switch it out, or is it an external thing?
     
  9. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    yes other wise you might blow the 6.2. it is a easy swap, on the left side of the tranny, at the rear there is a small cover. that is the governer. pry the cover off and pull the governer out. that easy /forums/images/graemlins/thumb.gif
     
  10. BurbLover

    BurbLover 1/2 ton status

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    So, to make this idiot er I mean Mark proof:

    1 - pry off both covers
    2 - remove both governors
    3 - switch governors
    4 - replace governors
    5 - replace covers

    /forums/images/graemlins/thumb.gif
     
  11. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    si es mucho correcto
     
  12. dyeager535

    dyeager535 1 ton status Premium Member

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    Could be wrong on this, as I haven't dealt with many 700's, but check the cases for the tag that is either riveted on or glued on the side. (my 4L80E has this, as do all 2004R's I've seen, and TH400's as well)

    Anyways, the first of the two large letters is the division (C for Chev, O for Olds, and so on, although not in a logical pattern always) and the second letter is the "strength" rating. A CA would be a weak chev tranny, a CZ would be the beefiest there is.

    Again, not sure if this applies to 700's, but something to consider. Typically the differences are torrington bearings vs. plastic bushings, more or less clutches in some cases, and different valve body/governor calibration.
     
  13. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    on the 700r4, the 4 cyl and small v6 the internals are different than on a 4.3 v8 and diesel trannys. you can bolt up a 2.8 700r4 to a 350 so no problem /forums/images/graemlins/thumb.gif
     

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