🚗 B&M 70239 Shift Improver Kit: Enhance Your Automatic Transmission Performance Review

If you have a 1985 thru 1991 Corvette Automatic you need to buy this shift kit. I spent a lot of money on engine repairs. I increased the power to 330+. Everything was great, and then I got into the drivetrain upgrade and found this shifter kit. Recommended by Corvette owners. This gave me the biggest improvement from 1st gear to 2nd gear. Immediate response to the accelerator pedal and the absence of sudden shifts.

I installed this kit on my truck (91 GMC Sierra C1500 2wd) in 2012. It took a day and an evening when a friend helped me. We had a truck on jack stands in our driveway. I used to install one of these in a friend's truck, but wanted to improve my truck's sluggish shifting. I used parts of the street stripe from Stage 2. Wow. It shifts so hard from 1st to 2nd that the tires bark, which is what I wanted, like 3/4 or more throttle, but since you take out the 1-2 battery spring and replace it with…

As always, B&M is here to help. The kit was easy to install if you are familiar with GM valve bodies. The test drive told the story that new life was breathed into my truck. Thank you guys.

Love this kit, I've only used a street kit. Supports better shifts, 1-2 shifts are fast hard shifts. For me this is not a minus, when exiting a traffic light or when stopping, my truck wheels slip when shifting from 1 to 2 gears. This kit will wake up your gearbox.

I used this shift kit with a Stage 2 rebuild and Corvette servo. I have a rebuilt 89 C1500 350 HO and my transmission blew up a few months after the engine was built. I bought a rebuild kit and this shift kit to improve shift times so I wouldn't burn the clutch between shifts, that did it and then some. This kit shifts insanely fast and tight. It shifts into 2nd so hard that the rear end squeaks at 15 mph. I am 110% satisfied with how he brought my truck to life.