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Q:do i have to take the tranny out of the truck?
A:Hi No! This B & M Shift Improver Kit For 68-81 TH-350 Transmission (Part No. 30262) re calibrate your transmission's shift timing and eliminates excessive shift overlap. For installation instructions, please copy and paste this link.
Q:when this kit is installed, will it affect the downshift when throttle is depressed part way or all the way?
A:The B&M kit will make the shift points more positive and allow the transmisson to run at a cooler temp.While the transmisson is allowing the slow shifting it causes more heat and more wear and tear on the transmisson clutch packs.The B&M kit stops this and allows better shifting in all throttle ranges.
Q:what dose it do exactly
A:These B&M Shift Improver kits are the easiest way to get the stout performance you've always wanted out of your automatic transmission. All you need are some hand tools and an afternoon, and you can turn your transmission into a B&M-tuned unit. Each kit has two stages to fit your needs: RV/Towing and Street/Strip.