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Hard Shifting, Slipping, Or Jerking Transmissions - Sun Devil Auto Some issues, such as adjusting the shifter cable, can be a relatively easy fix. Fortunately, there is a rather easy workaround for this problem. Between second and third gear it seems to be shifting slow/hard(?). Signs of a Bad Transmission Control Module Allison automatic transmission nsbu switch failure. There are not a lot of people calling it junk or calling for it to be removed from any GM trucks. His first thought was the C3 clutches, which work for third, fifth, and reverse. Your fuel filter is a very important part to change and 80k is way over due. The engine control unit (ECU) needs to be updated. However, if that doesnt work, you will need to have the vital transmission parts looked at. The solution here is to use hardened steel pump gears that do not enable the coarse gear to pump relationship that generates this problem in the OEM. If your Silverado is shifting hard, and you get the check engine light, there may be a diagnostic trouble code stored in the memory. Two other people in shop with same problem at same time. Problem #2 - The Valve Body Allison valve bodies are notorious for one problem in specific, valve seizure. Low Gear Oil The manual transmission also requires fluid to keep the gears lubricated and running correctly. That may take a few years to rectify yet but right now the biggest complaint we have seen is that the transmission is not made by Allison Transmission Company. It is a complicated system that has little room for error. is a sticking valve in the vb deadheading pressure and causing the fluid to overheat in that fluid circuit, it will come out of limp mode, shift into fifth gear and the temp will drop back to normal range. There are different problems with this device and we mentioned one earlier. On a recent trip to the lower peninsula of Michigan, we were approaching the Big Mack Bridge from the west, and I noted a very hard down shift of the transmission in the last couple of miles before the bridge. The transmission vacuum modulator valve is responsible for measuring the load from the engine to provide ideal shifting operations. If you feel that your vehicle is consuming too much transmission fluid, make sure that the reservoir is not leaky. The following day, Mike found that the customer had left a five-star review online. The manual transmission also requires fluid to keep the gears lubricated and running correctly. It is a well-designed device that has the capability of doing a lot for the truck it is installed. Yes, there have been a number of problems with the Ford 10-speed transmission, including: Erratic movements and jerking. Learn what might be happening and how to fix it here. This keeps the equipment lubricated so that It can move easily.