I had a draind and fill ATF servicce performed on my 05 Frontier at a local shop.I drove the vehicles for 2 days. I felt like a slight slippage in the transmission When accelerating from a standstill a couple of times. Did not happen all the time.Transmiision only slipped when I got into the accelerator a liitle bit. I found that the transmission was 2 qts low. Overall capacity of system is 12 qts. I approximately put 50 miles on the vehicle before adding the adding the fluid. Since adding, transmission is shifting fine. I was wondering would this situation dratically shorten the lifespan of the transmission.