I have a 4x4 94 Sonoma with only about 70,000 miles on it, last couple of months once in a while on the freeway the rpms would go high and the speedometer would drop, running weird, the problem would come and go, I gave it some tranny fluid and it seemed to fix it but recently it's got worse and today the rpms shot way up and I am barely moving, could this be a dirty tranny filter or something more serious, any help would be appreciated.
John
John