  We update the constraints on anomalous dimension four $\tbw$ and $\ttz$
couplings by using CLEO $b \ra s \gamma$ and LEP/SLC precision $Z$-pole data.
It is found that the data imposes very stringent bounds on them. Moreover, the
$2 \sigma$ pull from SM predictions of $A_{LR}$(hadrons), $A_b$ and $A_{FB}$(b)
have little chance of being explained by the strongly constrained anomalous
couplings.
