I currently have the transmission out with the valve body partially disassembled. It was working 100% before the shift kit install, which only had us replace parts in the valve body, but it was never able to shift out of first since. This is a basic video of an installation of a Transgo shift kit on a 4L60-E. This TransGo Reprogramming Kit includes valve body, servo, pump and accumulator components and modifications designed to deliver increased durability while. 5v to 3.4vīased on what I can find out by other forums and such, this collection of symptoms seems to be a very uncommon one. This is not a performance shift kit, it is designed to address most of the commo. TPS shows correctly in my transmission controller software, reading from about.Nothing I've torn down so far has any wear, and there's been no odd noises coming from anywhere while driving.Sonnax Corvette servo installed with just enough shims to allow the input shaft to still be hand-rotatable.Common complaints on this transmission are TCC slip or shudder, code P1870 or P0894, harsh 1-2 shift, double bump shifts, 2-3 flare up, burnt 3-4 clutch plates as well as inconsistent pressure boost problems. Using the gear selector/tree also doesn't get out of 1st/R This 4L60E-HD2 Reprogramming Kit fits 1993 to 2015 General Motors vehicles equipped with the 4L60E, 4L65E and 4L70E automatic transmission.Commanding gears with the trans controller doesn't change anything.You can kind of feel the transmission try to shift to 2nd barely when it's supposed to, and then stops "trying".If my transmission control/PCM is unplugged completely it limps still inġst gear (which to my understanding is supposed to be impossible, since both solenoids being off should be 3rd).The purpose of the springs is to increase hydraulic system pressure at all throttle positions so that maximum clutch capacity may be obtained. Both shift solenoids have a resistance of 25 Ohms and click nicely with a 9v battery Two pressure regulator springs are supplied in this kit.I've been through quite a bit of troubleshooting and am basically at a loss In a world of prepackaged kits, if I had to puick the lesser of all the evils, I would also say the Superior is your best bet.I have a 1999 4L60E from a 1999 Suburban that has been rebuilt twice successfully, and then had a TransGo 4L60E-HD2 shift kit installed that ultimately led to where it's at now with it's reverse and 1st only issue. If you're wondering how our transmissions shift without using a prepackaged kit? Most will chirp both the 1-2 and 2-3. The solution is a hardened hub.The list goes on. The boost valve works with stock parts and doesnt require transmission removal, meaning that installation is easier than other models. Make the 2-3 too firm, you'll break the input reaction hub. The solution is obviously a better band with a reinforced mounting lug. The stock lugs are also prone to ripping out. I've seen them break at the spot welds as well as just ripping the band in 2. Make the 1-2 too hard, you can break the 2-4 band. These modifications are to correct many design flaws that are sure to rear their ugly heads if we just try to make them shift hard. They really need associting modifications to go with a shift kit. Trans Gos thoughts on shift accumulation are way off with their spring and washer arrangement in addition to the fact that they don't even adress 2-3 accumulation, which is where the most important modification needs to be made.Ī 4L60E is a little different than an old TH350 or 400. When we modify them, we increase pressure more precisely, where and when it is needed. wears out the pump and valves, no lockup, no 4th gear, code 1870, cutloose or bang from reverse to drive, forward and reverse clutch failure, 1-2 bump shift. Corrects, prevents or reduces erratic pump slide bounce that. 4L60E 4L65E Transmission shift kit Transgo SK 4L60E. The problem there is that blanket higher pressure isn't the way to go. You save 14.38 35935 4L60E 4L65E Transmission shift kit 1993-2007. "Tuning" through the computer only reduces voltage to the solenoid, to increase pressure. Fail safe for the solenoid when there's no voltage present is max line pressure. The EPC solenoid regulates pressure and is based off a 12V source. Many choose to raise pressure through the computer to provide a firmer shift. The realistic approach isn't just to make the shift HARDER, it is to make the shift QUICKER, and provide more holding power. If you really have a concept of a 4L60E, you'd understand why this happens, based on their modifications. We see many 2-4 band and 3-4 clutch failures follow TG kit installs very closely. GM 4L60E/4L65E/4L70E Shift Improvement Kit by TRANSGO Part T74165E Fits 1993-2010 (EXCEPT HYBRIDS) Automatic 4 speed transmissions Instructions included. Unfortunately, the TG kit is the worst out of them all. Many people ask what kit we recommend, but there are no prepackaged kits that adress everything. We have 4L60Es in the 9s with our own modifications.
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