A good oil cooler is very important for heavy duty usage,
importance of the tranny and P/S coolers depends on
how the car is used,most of the heat generated by the
tranny is from the fluid being thrashed in the torque
converter when under"stall"conditions,steady speeds
generate far less heat. The tranny cooler on my car is
under the battery area with a thermostat controlled fan
(8"specially made fan) The Oil radiator is mounted in the
charcol canister area behind the LH headlights with 8"
high velocity fan,draws air from the holes behind the
headlights and the opening into the fender(i like to
run the engine oil at 220-230*) All my coolers and
parts for the setups were salvaged from junked cars,
the coolers from an'83 impala cop car,P/S cooler from
a '90s jeep

(from about '86 on,thirds have a light-
duty P/S cooler -steel tubing that loops under the
radiator support)