I have an 86 cutlass with a 373 Posi rear, 403 Olds with a Comp Cams 260 cam, A body headers, Offy 360 dual plane intake, and ccc setup. Due to a ridiculous situation the th350 trans was shot, I got a 60k mile 200R4 that I am about to put in. Obviously this engine is more powerful then a stock 307, I was looking in to shift kits when I talked to the trans re-builder he recommended this instead. http://www.transgo.com/sk_generalmtrs.php It says it "Corrects/Prevents/Reduces: 3-2 cutloose; 1-2 slide or slide-bump; wrong gear starts; down-shift clunk; rough 2-3; late shifts; early shifts; kick down delay." this sounds like a great kit but it doesnt seem very performance oriented. It seems like its more to correct all of GM's mistakes when they designed the transmission. Has anyone used this kit? Is it actually worth the effort? I picked it up for $30 from the supplier just not sure if it was a good idea. Ive heard of people having problems after installing a shift kit in a 200r4. The kit I was thinking of buying instead was the Trans Go Reprograming kit part number 2004R-HD2, it says it gives you Automatic: Crisp to Full Race.Stops 2nd band failure. But it seems to be more performance oriented, what do you guys think?