I have a 2007 gmc 3500 classic, all i do with it is tow a race car trailer about 12000lbs.I have a ppe on tow mode and a banks cat back.Going to have to get dealer to pull tranny out to fix oil pan and rear main seal leak.Should i install a aftermarket converter at this time and would i be able to tell a difference.I have'nt done anything to the stock tranny and really dont want to but would consider a converter, who does everyone recommend.THANKS...

Nice talking with you today.;)