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4L60E Trans mods 2003 GMC
Installed a TransGo shift kit and plate along with Sonnax pinless accums, Corvette servo and boost valve. Now I have a very harsh 1-2 shift at low speeds. I used the TG 3 spring pack in the 1-2 accum and piston at the top next to the plate. Is there anyone that has experienced this issue. Trans builders help would be appreciated... Thanks
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