Changed the oil yesterday in my 2003 cts caddy and today the tranny is slipping, could oil change have anything to do with this

First check transmission dip stick for correct fluid level. Next schedule a transmission filter change. This should have been done at 60,000miles

You have a dirty oil filter not keeping the clean oil you just put in clean. Not good for your engine.

You may have to check that the head gasket /s were properly positioned as the oil hole to the head/s may be blocked and not allowing oil to the lifters . If this is the case then on removing the cam shaft you may not be able to pass a small wire any further than the head thickness.

please do not have your transmission flushed , have someone take the oil pan off and replace the filter as well and what ever trans oil you take out replace it as well . no automotive repair shop will warrenty your trans if it should suddenly stop working , but just for your satisfaction ask the transmission repair shop who flushs trans if they guarantee it and have them put it in writing . ive never understood why flush dirty oil and leave the dirty filter in the trans , it collected all dirt and metal wear which is what is causing it to plug up causing it to restrict the oil flow

did u have computer reset after changing them

An now the trans slips more than before ?
Fluid changes don't repair anything,it's oil!!

Vehicle make and model would be nice

The trans is shot,rebuild it

Have you checked the transmission fluid level. Hard changing or slipping can be caused by low fluid level. If it is not this, then you will need to take it to a transmission specialist to have them diagnose it.

If you didn't already...you should change tranny oil and filter. This would be a good place to start even if it does not correct the problem. But...before changing tranny oil and filter...with engine running does your tranny dipstick show that tranny has a sufficient amount of oil? If not ...fill to proper level with engine still running and see if that corrects your problem.
Contact: [email protected] for more help if needed...Best wishes!

I'm not possitive but there is usually a vent tube on top of the transmission, may be possible that dirt or something is clogging it up. That would cause the tranny to build up pressure. But to blow the seal on a new radiator, I wouldn't imagine that. My opinion would be that the new radiator wasn't put together correctly. But just in case the vent tube did cause it to let go, check the vent. I hope that you find the problem. Best wishes.