| big undertaking. You can't just change the input shaft bearing either - it is pressed onto the shaft and you have to install a new bearing with the main shaft and countershafts dismembered from the center bearing plate, otherwise you will damage the #4 syncro when pressing the new bearing into place. My tranny is making the same exact noise as well - they all start to do that after a while of putting some big torque through them. I presume it may also be the heavy acceleration from so much power causing the oil to slosh to the back of the tranny. The trans is baffled pretty well and has a trap-door in the center bearing plate, but with the kind of acceleration we can get out of these cars, I'm sure the oil stands up against the bearing plate and not much gets to the input shaft or front countershaft bearing..... but I have my doubts on that theory given that the bearings WILL have latent oil within them and it is more a matter of torque accelerating the wear of the balls and races. Ceramic bearings perhaps?
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