hi hope spmeone can help i had 235/70r15 tires on my truck i went a put on irocz rims with 255/70r16 only on the back for now after a couple of days the trans started slipping it wouldn't shift from 2nd to 3rd and other times it does i know putting on bigger tires will throw things off but how would i fix this or is the trans going has 170,000 on it