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Tranny Temp Guage Installation "Q"

Discussion in 'The Garage' started by big jimmy 91, Apr 12, 2005.

  1. big jimmy 91

    big jimmy 91 1/2 ton status

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    Can someone tell me "exactly" where the pressure test port is on a 700 R in my 91 Jimmy
    I would like to install the mechanical guage I just picked up soon
    Thanks
     
  2. DieselDan

    DieselDan 1/2 ton status

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    Driver's side, forward and above where the shifter shaft protrudes the case (IIRC). Tell us how this goes for you. I've thought about doing the same thing, especially since the 700R4 is so pressure sensitive. Gonna need about a 300 PSI though.
     
  3. big jimmy 91

    big jimmy 91 1/2 ton status

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    What do you mean by pressure sens. and 300 psi. , is that the amount of press at the test port? :confused:

    I would hate to do something wrong and screw up a functioning tranny :doah:
     
  4. TorkDSR

    TorkDSR 1/2 ton status

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    i dont think you really want the temp gauge at the pressure port, it will be very slow to react to temp change, and by the time it's overheated you will be s.o.l.
     
  5. big jimmy 91

    big jimmy 91 1/2 ton status

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    Are there any tranny "guru's" out there that know the best place to install a temp. sending unit?
     
  6. Triaged

    Triaged 1/2 ton status

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    You can't put a mechanical sender in the test port. The test port is 1/8NPT and I bet your mechanical sender is more like 3/8NPT. You will either have to splice a T into the cooler line or put it in the pan by welding in a bung.

    FWIW this is the pump press test port (where I have mine and it works fine):
    [​IMG]
     
  7. big jimmy 91

    big jimmy 91 1/2 ton status

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    I had a look under the truck and it does look like my sender is too large to fit.
    I guess it will have to go inline with the cooler lines
     
  8. Jonny-K5

    Jonny-K5 1/2 ton status

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    best place is in the pan. besides, id much rather put a bung in the pan than splice in the cooler lines, but thats just me.
     
  9. kyser_soze

    kyser_soze 1/2 ton status

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    I have also put mine in that port. It works fine, no problems at all.
     
  10. heavy4x4

    heavy4x4 1/2 ton status

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    Take a look at the pics in my Webshot link in my signature. I think the pics are in my "modifications" folder.

    I put my sender in the pan...passenger side, towards the front. All I did was drill a hole, tap it (which only gave me 2 or 3 threads), thread the sender in, and JB Weld around it. Never had a leak.

    Oh, and I put it in the pan because I feel that's the best place. That's the temperature of the fluid that will be running INTO the inner-workings of the tranny. The cooler line out of the tranny is at the temp after it gets heated up by the torque converter, etc. The cooler line into the tranny tells you what the temp going into the pan is, but that just heats up as it sits in the pan. The pressure port is not a good place to use, in my opinion.
     

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