1990 Merc Cougar Xr7. for quite some time now i've had no overdrive. just recently (only when its cold) the tranny does not want to shift from 2nd to 3rd. my diagnosis, the trannys going?? is this one savable??(with out rebuild yet) another option is i have another tranny out of a 91 t-bird, however its not a super coupe. both motors(my cougars and t birds) are v6 but mine is supercharged and the t bird wasnt. they'll bolt up im almost positive, but will the tranny from the t bird be able to handle the supercharged cat??? ANY feed back would be GREATLY appreciated, thanks in advance to any responces