I too put in just the K1 and K2 springs from the kit, and it fixed the horrible 2-3 and 3-4 flare I was having. I tried the usual vacuum checks and adjustments, with very little improvement. The old main spring in the K2 was broken into 4 pieces! The old K1 springs looked ok, but I replaced the whole thing with one big spring from the kit. After installing two springs from this kit, a new filter, gasket, and 60 dollars worth of Mobile1 ATF, my transmission is now just about perfect. Total cost approx 125 bucks.