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700r4 guru's input needed

Discussion in 'The Garage' started by CB77GMC, Jan 14, 2007.

  1. CB77GMC

    CB77GMC 1/2 ton status GMOTM Winner

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    Just speaking in general if you have a 700r4 with temp gauge in pan and extra cooler inline with radiator cooler. Will your engine temp gauge and your trans temp gauge read the same after all warms up ? This had come up today chatting with a guy. I was thinking maybe :confused: What y'all think ?
     
  2. Col_Sanders

    Col_Sanders 3/4 ton status

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    It should be cooler than your engine coolant. Your 700 should be around 140-150 degrees I believe.
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    When i had my external tranny cooler (hooked in conjuction) the tranny never got over 160*, my cooler developed a leak so i took it off and now my tranny runs about 180* but still cooler than my cooling system.
     
  4. CB77GMC

    CB77GMC 1/2 ton status GMOTM Winner

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    There has got to be more people running trans temp gauges. Post up your engine and trans temps when all is warm and what you use for cooling on your 700r4.
    Mine is engine 185* trans 160* with radiator and cooler.
     
  5. Col_Sanders

    Col_Sanders 3/4 ton status

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    Come to think of it I believe 160 is ok. When I installed my BTO tranny the info sheet did say 160, 180 is bad.
     
  6. bandit4369

    bandit4369 Registered Member

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    If you want it to run cooler use a plate cooler instead of a fin type cooler. They're more efficient, you can also install a temp controled fan unit on it.
     
  7. Thunder

    Thunder 3/4 ton status

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    Even if you did not have an aftermarket trans cooler.If the radiator is in good shape there Sould be quite a diference between the engine temp and the trans fluid temp. The stock trans cooler is located on the cool side of the radiator. So depending on outside air temps the water that is in the tank that is cooling the trans fluid will be conciderably cooler than the return water from the engine which is where the engine temp is monitored..
    I have a temp guage in the pan in my 700 it usually runs around 150-160 Engine runs 195 normally. Trans temp will creap up to 185 towing up hills in the summer ,engine will get up to 210. I have a B&M plate cooler Fluid goes thru the B&M cooler first > then thru the stock cooler >back to the trans.
     
  8. clarkjw24

    clarkjw24 1/2 ton status GMOTM Winner

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    Would having 35s and 3.08s contribute to a higher tranny temp?
     
  9. CB77GMC

    CB77GMC 1/2 ton status GMOTM Winner

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    Good ? anyone
     
  10. randy88k5

    randy88k5 1/2 ton status

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    My trans temp varies pretty wildly, but I live in the mountains. Engine runs 190-195, and tranny runs about 160-180. Going up a steep long hill, tranny will get to about 210-215, engine a little higher. Both seem to cool off very fast going back down the hills. Yes, I know the temperature spread, and occasiolanny Ill pull over and let it cool, or Ill turn on my secondary electric fan. Pushing over 6000 lbs, 37" SSRs, and 4.56 gears seems to take its toll...
     
  11. randy88k5

    randy88k5 1/2 ton status

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    Yes it will. You'll have to run the engine harder to get the same acceleration.
     
  12. CB77GMC

    CB77GMC 1/2 ton status GMOTM Winner

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    So basicly 700r4/208 and 3.08 gears with 35" tires is a bad idea because of heat. Time for gear change. Anyone run this setup no problems ?
     
  13. grimjaw

    grimjaw 1/2 ton status

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    Wow thats only 1557 RPMs at 75 mph.
     
  14. sgarrison

    sgarrison 1/2 ton status

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    My trans. temp. runs between 140° and 160° and I bypassed the rad. altogether. I just run A BIG COOLER with a 650 c.f.m. fan behind it. On the street I mostly keep the converter locked. No problems so far.:rolleyes:
     
  15. nemesis_pyros

    nemesis_pyros 1/2 ton status

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    4.10s 35's and my 700r with only an after market cooler never goes over 140 in the summer(these temps are from the line going from the tranny to the cooler. And in winter the needle never moves. Motor runs at 180 ish
     
  16. sgarrison

    sgarrison 1/2 ton status

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    Where is the sending unit for the trans. temp. mounted?
     
  17. CB77GMC

    CB77GMC 1/2 ton status GMOTM Winner

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    In pan drivers side about 3" from rear.
     
  18. sgarrison

    sgarrison 1/2 ton status

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    Me too.
     
  19. ntsqd

    ntsqd 1/2 ton status

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    On driving away from a stop you will be using the converter more. That builds heat faster than anything else.

    FWIW a friend is putting a BTO 700 in his Early Bronco. The papers that came with the trans said that they want to see a max temp of 160*f.
    Some time ago I saw an article in a trans rebuilder industry magazine that charted trans life vs. temp. At 300*f it was a matter of minutes. At somewhere in the 100-120*f zone it was basically indefinite. The one thing that this didn't address was condensation.
     
  20. 87BrnRsd

    87BrnRsd 1/2 ton status

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    Definitely a bad idea. You need at the minimum to run 4.10's. But if your going for a gear change, might as well go 5.13's.

    Im running 4.56's with my 700/208 and 37's. I dont have a tranny temp guage so I dont know what its running at, but I did buy a 28,000lb B&M stacked plate super cooler just to be sure. I havent had any problems in the 4+ years ive had this setup.

    My brother blew up a th350 in 2 years running 3.08's and 35's though.:doah:
    -Harrison
     

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