Transmission Ticks

I have a 95 blazer 4x4 with the 4L60E transmission. When I put it in overdrive the transmission makes a ticking sound, but not in all of the other gears. Everything shifts fine and no light is on YET. Fluid level is good and filter was replaced 2,000 miles ago.

I have a 95 blazer 4x4 with the 4L60E transmission. When I put it in overdrive the transmission makes a ticking sound, but not in all of the other gears. Everything shifts fine and no light is on YET. Fluid level is good and filter was replaced 2,000 miles ago. have you checked the timing. detonation will sound like its coming from the tranny and/or the tranfer case-lee