Regarding the jerky shifts after a fluid change on your 41TE. That is not uncommon after a fluid change - regardless of the fluid. It is always suggested to perform the "quick learn" with the scan tool to reset the adaptive values after a trans replacement, overhaul, valve body, solenoid pack replacement and in many cases just the fluid change. If you don't use the scan tool to reset the adaptives - it just takes longer for the trans controller to learn again - by driving it and performing various upshift and down shifts - it will accomplish the same learning - this is called the "drive learn". It only learns between approx. 80 to 120 F - lower or higher than these temps - it won't learn.