![B&M Automatic Transmission Shift Improver Kit; 4L60E (99-06 Sierra 1500)](https://www.americantrucks.com/image/bm-sierra1500-automatic-transmission-shift-improver-kit-4l60e-70360.S149539.jpg?obj=car&wid=640&hei=480&sharpen=1)
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Description, Q&A
Description. The B&M Shift Improver kits feature two options to recalibrating your 1982-1993 GM TH700R4/4L60 automatic transmissions. First is the HEAVY DUTY set-up, giving you firm positive shifts without loss of driver comfort for improved performance in all street vehicles. This is a great option for performance street driving or towing. The second is our STREET/STRIP set-up. Be warned, this will deliver firm positive shifts you will feel, along with easily chirping the tires when shifting somewhat aggressively. This setting is recommend for high performance street/strip use, or for competitive events when you want the hardest, quickest shifts possible from a shift improver kit. Note: Does not fit GM TH4L60 (non-electronic) transmissions.
Fitment:
B&M 70360
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