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Is the area "wet" with tranny fluid? This could be causing the caps to deteriorate quickly if your vacuum modulator is beginning to fail. (I'm assuming you have an automatic tranny). I haven't experienced this, but I understand if the modulator fails, it usually sends tranny fluid up to the tee. As soon as I can get my Ranger back from my son, I'll take a pic and post it here...If I can figure out how to do it!