The F23 is considered to be the successor to the Getrag 282 and 284. It is another 5 speed transmission from Getrag that was available in a few FWD GM delta platform cars.
Similar to the F40, this is a 3-axis design which differentiates it pretty heavily from the 282 and 284.
It is known to be quite strong based on a few posts across many forums, but evidence is a bit hard to find. It is rated for 170 ft-lb of torque, but like most Getrag transmissions it has been known to handle significantly more than this. Some have even claimed it is stronger than the F40 transmission.