Knocking sound when accelerating or stopping in a 2012 Tacoma

I have a situation, I bought my second-hand truck, it had a knocking sound that was reflected in a wobble of the differential, but this only occurs when braking completely and when starting, a few modifications were made to the leaf spring to try to solve the problem, it was possible to reduce it by also adding a more rigid bearing, however the knock continues, it is worth noting that if it is cold the truck does not make the noise and if I am driving and put it in neutral it does not make the noise either.