Luckily, I have some inclination as to what might be causing it but I’m not positive so I really need some help. To get better shifts is a better way to leave a shift time in there and adjust the oncoming pressure presets to gain speed in the shift. Aug 24 2015, 6:34pm. YES. Clunk started immediately after I bought truck, and I even complained at first oil change. Erratic shifting. In the trucks anything faster than .2800 - .3000ish or so will make it slam gears and clunk … 1. ... downshifting one gear and locking right back up in the lower gear, but in a very ham fisted way. Hey, I got an '08 with the 6 speed and a 5.3, mods are a BullyDog programmer and a single to dual magnaflow and AFE intake and spacer. 6L80 Upr Vlv Body Asm 24231442 24240961 6L90 Upr Vlv Body Asm 24226709 24240953 2009 prior 2010 Later Spacer Plate Update . NOTE: A small 2-3 upshift flare or overlap issue, clunk into 4th Gear and a 3-2 downshift clunk … Common Issues When Transmission Makes Clunking Noise. Road test vehicle performing 10–15 upshift and downshift cycles at light throttle through all six speeds. My problem is under hard acceleration and the engine has to downshift to second gear or third (only has a problem in these two) the engine will downshift and rev out, then grab and its deffinataly not a firm shift at all, very sloppy. 6L50/80/90 DTC’s P1825, P182E, P1915 Mode Switch Codes – Chevrolet, Cadillac, GMC, Hummer and Pontiac vehicles may have any of these codes set along with the PRNDL display not functioning. Letting it warm up for a minute makes the problem go away. If the trans is in the middle of a downshift when coasting, it will lock out the throttle completely until the shift is complete. 6L80 Shown Compensater Feed Valve • Harsh shifts • Downshift clunk • Bump/Flare shifts • Bind-up • Burnt clutches • Overheated fluid Replace with Sonnax Part No. One common trigger for major auto repairs is transmission problems. 6l80 Slipping converter? a. If you are looking to get the most of your vehicle with 6L80E /6L90E transmissions and considering a major trans upgrade, Gearstar has the best products available on the market. One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. All right guys I’m reaching out to the experts here for help with my transmission problems. Maybe 10% TM removed on the 6L80e's I've done. The issue is that my 2012 4wd Tahoe is having really weird shifting points, especially in the low gears and it jerks a lot when taking off. Mine bangs the 2-3 when cold and you get a nice big old driveshaft clunk out of it. Usually a bad or failing downshift solenoid will produce a few symptoms that can alert the driver of an issue that needs to be serviced. 104740-09K TCC Regulator Apply Valve • Code P0741/P0742 • Failsafe mode • Overheated fluid • High TCC slip RPM • Harsh shifts • Harsh TCC apply Perform 4-5 passing gear maneuvers at high speed. b. The 8-speed GM transmission has often been criticized for exhibiting shuddering and harsh shifts, but a new fluid flush may fix the issue outright. 6L80E/6L90E Performance Transmissions Upgrade. Your transmission is necessary in order for your car to operate correctly, and if you start to hear it make a clunking noise, …
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