you just buy the 4k kit, and leave the inner springs out, thus making it a 3k kit, then when you have the cash to swing for the 60# hd valve springs you can simply throw the inners in and enjoy the 4k springs. but, be aware that your valve body has to be set up to shift with the desired kit, putting a 3 or 4k kit in a stock trans wont usually net very high shift points unless you manually shift, but with a good vb kit, you choose if you want 3k's or 4k's, and they will supply the right springs. the 3k kit is usually best because it requires the least work and money, and is the best bang for dollar. if you have time to play with them, washers can very closely mimik a 3k kit, just not quite as hard fueling up by 3k rpm's. a lot of people try and tighten the stock retainers down, but thats pushing on the idle springs too, not fun. a 3k kit can be had for about $90 and takes about an hour if you know what your doing. theres also special tools you can make to help make the job smoother. if you have never dug into the pump, it might be best to get a friend that has for peace of mind. if you loose a bolt or something and dont get it out, there goes your nice pump.