Whats the real difference between the two?? The logic is all the same as to how to firm up the shifts and the work is basically being done in the same place. Both kits require you to enlarge holes in the seperator plate, move check balls around and replace accumulator springs with either spacers or stiffer springs. Spacers will give you the strongest shift where a stiffer spring will just make it firmer. The reason I say this is because I know that B&M uses the spacer and leaves out the 1-2 accum spring therefore yielding a strong shift. I am assuming that TransGo replaces these with stiffer springs. What I am trying to get to here is this: Is there anything in the way the B&M is designed that will actually kill a tranny?? If so, how and why? Assuming of course that the installation was done right!! I have used the TransPack before with good results and a wanted to ask this question because I see alot of people on this board say alot of bad things about the B&M kit. I respect everyones opinions on this board and just wanted to get past the reputation and find out if it really is a poor product or if its just people's personal preference as to how it works. (shift characteristics etc..) From the modifications that B&M requires, I dont see how it could kill the tranny unless you beat the crap out of it 24/7. Thanks for reading, looking forward to seeing all your input. Alex

NOt sure but I think the B&M Street (Stage II) version (not the HD, Stage I version) is actually TOO harsh in its methods, whereas the TransGo is more tranny/part/band/drivetrain friendly in the long haul and is more adjustable...

ProBuilt is gonna have to answer this one, though. I have had good luck with the B&M Stage I but the firmer Street installation is too harsh.

You answered this yourself, by taking out the 1-2 accumulator you get yourself a bang shift. The 1-2 accumulator is taking some of the 2nd gear oil at a certain rate (depending on which 2nd gear accumulator is used in the valve body). This absorbs some of the shock, thereby making the shift smoother at light throttle. Changing the size of the 2nd gear feed hole and/or changing the 1-2 accumlator spring can or will change shift firmness. Changing to the Corvette servo will change firmness for 2nd & 3rd gear. Putting washers under the 1-2 accumulator piston will firm up WOT. Ideally you want fairly smooth part throttle, and the shifts should get progressively firmer with more throttle. This is not easy to do.
Hope This Helps!!!