Installation Time: Afternoon
September 18, 2018
Perfect fit, works for automatics, too.
I wasn't sure about buying this radiator for two reasons: 1) I'd never used any of their products and nobody I knew had them, and 2) it said "manual only" and I have a built 5R55S.
It was only after talking with my uncle, who's been building cars, hot-rods and working on exotics all his life, that I paid closer attention to Mishimoto, as he recommended them. I don't take anything he recommends lightly given what he works on and his experience.
The radiator came in and looked great! I was expecting to have to fabricate some kind of mount for my stock transmission cooler (I run a compound cooler setup with the stock cooler in line with an aftermarket Derale cooler to keep my built 5R55S under control). Immediately after taking it out of the box and bag I saw that it had exactly the right mounts already on it for the stock trans cooler!
I get that some radiators for automatic cars are a combined unit with the trans cooler and radiator as one unit...but that's not the case with the S197 mustangs (at least) so listing this as "manual only" was confusing at least. I almost didn't buy this radiator because of this.
As for the radiator itself, it went in perfectly. It doesn't have the bulky extra plastic on the sides sticking out so it was even easier to get into place than the stock radiator. Only one of the holes (the top driver-side condenser hole) was off by about half the width of an M6 bolt, but that wasn't anything difficult to correct.
I got this radiator because I had to completely rebuild my coolant system among other things. As it stands I'm still putting the car back together so haven't run it yet, so I don't have any feedback on cooling performance. I have no reason to suspect it would be any less than the stock unit at the very least. Very nice drain plug and fittings.
One thing I will say is that upon arrival the radiator had a tiny amount of metal flake and "fuzz" inside, but no mechanic worth their salt would think of putting a new radiator into a car without flushing it first anyway.