Improve the shift quality of your 5 and 6 speed Duramax with this RT-A-ES Spring set. Higher calibration shift value springs provides quicker cleaner shifts. No drill, easy install.
2001-2019 5&6 Speed Allison 1000 Transmissions
For the best results, pair this RT-A-ES sping set with Mike L Trim Springs
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WARNING: Cancer and Reproductive Harm