01 3.4 making ticking sound in gear please help

My 01 double cab is making a ticking type sound. It seems to only do it under load when truck is put into gear. Makes the sound more when put in reverse and the truck has like a slight shake to it and kinda acts like its struggling. Only does the shake in reverse. Transmission runs and shifts smooth. Motor mounts are good. I don't have any clue what the shake is from and a buddy said the ticking sound maybe the timing belt. Anyone shed any light on this? It is more annoying than anything

 

Same problem i have, any resoulition yet

 

I have an 03 3.4 and my truck ticks the loudest when it is in drive and the RPMs are low. I thought it was the normal Toyota tick as everything has been fine? It seems to be under the drivers side by the transmission where it is the loudest.

 

Been trying to find info on this but it is scarce, to me it sounds like it is comming from the front of the transmission, torque converter area. truck drives and shifts smooth but the sound is disconcerting.