as long as the convertor efficiency is correct up top there will be no issues.locking it is also important,otherwise an open convertor would have been used.3800 rpms is optimum for max performance with this application,if convertor is looser above this i will work with tcs to get coupling to an acceptable level and still get desired stall speed needed to gain proper starting line rpm and ratio.we have used this convertor effectively with a 45a and still see 660 rpms drop unlocked on a 1/2 .keep me posted.