Help Identify This Gearbox

Hello

I can't see obvious difference with mine (normal Mondial T) but perhaps the best way would be to identify it with the 6 digit reference written near the oil drain and just before the gearbox identification number.
Mine is a 141685 .

 

143542. It is a Mondial T gearbox, don't know about the Valeo version. The Mondial T had two styles of mounting the gearbox.
Early cars had the "3P" mounting style which was two engine mounts plus one upper gearbox mount suspending it from a chassis
cross member. The later and more common style was the "4P" style which had the two engine mounts plus two arms bolted to the triangular
bosses near the front of the gearbox.

 

It seems that the F parts suppliers have omitted the part number for that gearbox casting from the SPC (so nothing comes up if you search on 143542), but the SPC figures show the physical differences that 4redude mentioned. The SPC figure that you posted (and what you have) is the 4P style. Here's what the 3P style looks like:

https://www.ricambiamerica.com/car-diagrams/ferrari/v6-v8/mondial-group/mondial-t/gearbox-housing-and-interm-casing-valid-for-cars-with-3p.html