anyone use a shift kit forceing the shift 1 to 4 faster how bad will it hurt the trans

 

According to the information at the shift kits sites, faster / harder shifting will improve transmission performance and prolong transmission life. The same opinion was given to me by several guys that I spoke to. Both have high performance trucks that have a lot of mods and see frequent dyno tuning. However they also said a SCT tune will improve transmission performance just as well without having to perform work on the transmission like a shift kit requires.