Transmission just started making a grinding noise in first gear only and only while unloaded/decelerating. Reverse, second and third all ok. Probably a bearing out but seems to be ok to drive around until I can pull the transmission. I know it is easier to pull the motor and trans together but wondered if anyone has experience pulling just the transmission, leaving the motor in the car. Also, wondered if I could add overdrive while the transmission is out either by adding the period correct overdrive or swapping to a later four speed transmission. Thanks for any advice.