Some of the v8 transmissions were the same as the v6, depending on the years. First off how many miles does your explorer have? Also, it may not be the shift solenoid. Other issues occur that may make it seem like that. Check on autotrader/craigslist, a lot of the time you can find a wrecked one. Getting a automatic rebuilt can be pricey, standards are always cheaper. I just had to drop my friends T-56 tranny out of his 98 z28 to rebuild it, of course it was really cheap because he just had to give me a little money and treat me to lunch.