I got my Ramifier installed and all I can say is what a difference. But there is one problem. I noticed my trans is slipping about 2-300 rpm when the converter locks in OD. I am pretty sure the converter slips in 3rd too but it is hard to tell. The tranny temp has never gone over 150, usually around 130 so its not overheating. It only really does this when the revs are between 1200-1800. It seems to be ok when it is above 2000. The only other thing that could have caused this is when I did the trans temp gauge. I dropped the pan to weld in the bung and lost about a half quart. When I refilled it I used some +4 trans fluid. Any help would be appreciated before I shell out a bunch of cash for an ats converter and valve body.

 

It could be the OD clutches, or the front and or rear clutches slipping!!
It is impossible to tell by driving it.
It is a general guess that it is the converter clutch that slips.
When mine went to slipping, I found the front two clutches had slipped quite a bit and were discolored. since I can't won't open a t-converter i'm not sure if it was slipping too.
You are simply over powering your trans.
Upgrade it/raise the line pressure and hope it goes a few more miles or just get a upgraded trans.
sorry this is happening.