4SECA Before you go out and buy things, you might want to touch base with Bob at ERA. With the different frame we have there is not alot of open room under the car. I have seen the setup on the orginial cobras like Dick Smiths and have pictures. The room is tight. The other tought is buying a 3 or 4" bildge fan and use the right side foot duct to tap into and run air down the tunnel to help cool the trans and the rearend brakes. If you are going racing, outboard brakes are the better way to go. I run 3 fans under the hood of my car. 2 for getting hot air out of the fender ducts and cool the motor and 1 for cool air down the tunnel. I have fire insolation on the tunnel and it gets hot in the summer. The brakes get soft with the pedal and the trans will not shift smooth after a 15-20 minute run on the track. Moving the dead air out has helped. Weldon sells a differential pump. You will need to drill and tap the jag housing top and bottom, add a cooler that will get some fresh air to it. Wiring with a fuse and relay and switch to run the curcuit. The small fan is cheaper to do and works.
Got to ask, Are you track racing? if not, and just street driving with a visit to the track, you reallly don't need a cooler. Top of the line Diff
oil will work fine. Rick L.