I have an 850 GLT that is experience hash shifts in the transmission, this happens when I'm on the high way doing about 70-80mph. In order to regain some smoothness I have to get my foot off the gas pedal or accelerate. Is this a sign of a failing tranny or I just need to change the ATF? Oops this is happening after I added a 24Oz of Lucas transmission fix to control some leakage at the tranny...
Thanks for the expert advice
Mad4vovo