hi, my dad has a '96ish S-10 blazer with the 4.3 & 700R4 trans. he said he noticed oil underneath at a fuel fill-up and there was oil on the back window and tailgate. seems to be pushing oil out the vent tube, wasnt pulling anything and trans didnt appear to be running hot, has no shift issues and oil level was only slightly low. i have no idea why it would do this except for high oil level or overheating. any ideas out there? thanks. dave.