jamian1

I have a 98 Chevy express van with about 100k miles on it (305 auto
trans)
I "DID NOT" change tires gears ext. for about a month the trany would
sporadically not down shift. Now the problem has become consistent
along with the speedometer now reads about double the speed (50 mph
when your doing about 30) this of course causes poor shifting and the
ABS light to come on. There are no error code's (I can get to) nor is
the check engine light on. So I changed the speed sensor which
changed nothing. Any Ideas

I have a 98 Chevy express van with about 100k miles on it (305 auto
trans)
I "DID NOT" change tires gears ext. for about a month the trany would
sporadically not down shift. Now the problem has become consistent
along with the speedometer now reads about double the speed (50 mph
when your doing about 30) this of course causes poor shifting and the
ABS light to come on. There are no error code's (I can get to) nor is
the check engine light on. So I changed the speed sensor which
changed nothing. Any Ideas