well i'm not sure if this has been answered but couldn't find it on here, well i'm looking at shiffting kit for an 700 r4 transmissions i heard of trans go and other products, but not sure which is an better brand to buy and would last too

 

First, a little history. The name Shift Kit is a registered trademark of TransGo. TransGo was started in 1959 with the intention of finding the causes of complaints and failures in a particular transmission and converting that info into a kit that could be installed in the tranny.
You would be surprised that a true Shift Kit does NOT make hard shifts and is intended for passenger car and light truck use. They spend sometimes years researching a tranny to see what it does right and what it's weak points are before they can finally offer a Shift Kit for it. They also make a Reprogramming Kit which uses the Shift Kit for a particular tranny and adds HP/HD capability, and yes firmer shifts too. They generally speaking will give you the ability to select any lower gear or hold a gear to any speed with the shifter.

B&M and the like, on the other hand always have the same goal in mind: Hard Shifts. To accomplish this they have a set formula that gets applied to every transmission. A) Block or limit the smoothing devices (accumulators). B) Jack up the line pressure. C) Hog out the feed holes. The result is always hard shifts but often that has nothing to do with WHY a tranny fails and is more a RESULT of another problem causing soft, slipping shifts.