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  • What temperature should my transmission be?

    I recently installed a transmission temperature gauge in my Suburban, but I don't really know what the expected temperatures should be. It seems to run about 150 on side streets and drop to 125 after several miles on the freeway.

    I have a 96 K1500 with the stock trans cooler and 3.73 gears.

  • #2
    Re: What temperature should my transmission be?

    In theory it should be pretty much the same temp as the engine. Sounds kinda cool, which is certainly a good thing if it's right.

    Used to own a FSC, now I just have my extremely old Buick.
    Have some perspective please. Thank you.

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    • #3
      Re: What temperature should my transmission be?

      Originally posted by shadowdub View Post
      I recently installed a transmission temperature gauge in my Suburban, but I don't really know what the expected temperatures should be. It seems to run about 150 on side streets and drop to 125 after several miles on the freeway.

      I have a 96 K1500 with the stock trans cooler and 3.73 gears.

      My sending unit is in the pan, and my temps are identical to yours with my stock cooler. 97 x-cab 4x w/ 350.

      -Jared

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      • #4
        Re: What temperature should my transmission be?

        well i got the trans gauge in the test port and when gettin on it. would get up two 180-186 and just flipin through town 165-175
        now i bought a hayden cooler part #678 and now it stays around 145-155 with the cooler. also it get hot in the south. and i see your up north. but when your on highway it will go down a little and having AC on will make it go up too.


        :fsg: 98 k1500 5.7 Magnaflow exhaust BBK 80 mm throttle body AEM brute force CAI nelson performance tune 93 octane RC 6" 285/70/17 BFG KM2 4 14 bolt sf disk brakes 4l60e fully built

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        • #5
          Re: What temperature should my transmission be?

          As cool as possible, well, not freezing. The highest ive ever seen mine is 150 and its plumbed through the radiator (195). I have a tru-cool 40k gvwr cooler and it works great.

          When I saw the temps go 200+ on the stock cooler I said thats it, and bought the biggest one I could find.

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          • #6
            Re: What temperature should my transmission be?

            I am thinking I should upgrade my cooler as well. I have only towed my boat once since I put the gauge in but I was flirting with 200 coming up a ten mile long incline and I had a lighter load in the truck than I usually have when I cross the mountains.

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            • #7
              Re: What temperature should my transmission be?

              my thought is if u have big tires u play in mudd or tow anything putt a tranny cooler on. rather spend 50 bucks now then 1000 later on transmission


              :fsg: 98 k1500 5.7 Magnaflow exhaust BBK 80 mm throttle body AEM brute force CAI nelson performance tune 93 octane RC 6" 285/70/17 BFG KM2 4 14 bolt sf disk brakes 4l60e fully built

              Comment


              • #8
                Re: What temperature should my transmission be?

                Will I be able to buy a larger cooler that will work with the existing lines?

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                • #9
                  Re: What temperature should my transmission be?

                  yep, mine came with 4' of hose that attached to the existing lines.

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                  • #10
                    Re: What temperature should my transmission be?

                    u will need a fitting for the factory tranny cooler


                    :fsg: 98 k1500 5.7 Magnaflow exhaust BBK 80 mm throttle body AEM brute force CAI nelson performance tune 93 octane RC 6" 285/70/17 BFG KM2 4 14 bolt sf disk brakes 4l60e fully built

                    Comment


                    • #11
                      Re: What temperature should my transmission be?

                      I believe anything over 180 could mean death for the 4L60E. No matter what though, every auto can benefit from upgraded cooling. Your tranny will last longer and shift more consistently, which is a definite plus.


                      1983 Jimmy Sierra Classic-Future LSX Swap Recipient
                      2002 Silverado 2500HD CCSB LT-Daily Driver
                      1995 Corsica-Super-Sleeper in Progress

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                      • #12
                        Re: What temperature should my transmission be?

                        i know my buddy was laughing when his tranny got to 220 on the beach i told him just to spend 60 bucks than 1000 later


                        :fsg: 98 k1500 5.7 Magnaflow exhaust BBK 80 mm throttle body AEM brute force CAI nelson performance tune 93 octane RC 6" 285/70/17 BFG KM2 4 14 bolt sf disk brakes 4l60e fully built

                        Comment


                        • #13
                          Re: What temperature should my transmission be?

                          http://www.transmissioncenter.net/FluidChart.jpg i think this chart has been posted somewhere but here it is.

                          2005 2500HD>Duramax>EFI Live DSP5 by Punisher Performance>FASS Platinum LP>AFE Turbo MP>EGR Blocked>PCV Rerouted>Mild audio setup>4" Exhaust>Alligator Performance Race Fuel Valve>Edge Insight CTS

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                          • #14
                            Re: What temperature should my transmission be?

                            Originally posted by sw45 View Post
                            http://www.transmissioncenter.net/FluidChart.jpg i think this chart has been posted somewhere but here it is.
                            According to that chart i was way off, but i'm pretty damn certain you want to have your 4L60E below 180 though. Worked with a guy who had his 4L60E blow up within 60,000 miles (90,000 kms). which was a 99 or 2000 RCSB 1500 with 4.3L. so it wasn't under too much stress really.


                            1983 Jimmy Sierra Classic-Future LSX Swap Recipient
                            2002 Silverado 2500HD CCSB LT-Daily Driver
                            1995 Corsica-Super-Sleeper in Progress

                            Comment


                            • #15
                              Re: What temperature should my transmission be?

                              Anything over 210 start really watching it. For every 10 degrees of temp after 210 will shorten your fluid life by half. So 220 half, 230 now down to 1/4 of the life and ETC... If you did like I did before I had a temp gauge and cook it to where it puked out the vent tube then I feel your pain. I also agree anybody with a 4l60 should have a good cooler and temp gauge.
                              98 silverado 4wd 3.73gears,5.7l,headers,under drive pulleys,78mm ported and polished tb, k&n fipk,catback, zz4 cam, roller rockers, lt4 valve springs, 411 swap tuning by me.

                              Originally posted by Redneck Rebel
                              fsc demo derby time. Would've been a better disposal system than the Cash4Clunkers BS

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