I have the Tremec Magnum XL with 4:10s and a supercharger.
I chose the lower ratio 2.97 first etc., in other words, the lowest geared XL, meaning higher numbers.
Yes, you will really miss the 4th gear pull of the MT82.
I switched to 4:10s from my 3:73s in order to get closer to the numbers of the first gear of the MT82 with 3:73s.
You'll see what I mean right after you put the Tremec in but didn't put in 4:10s.
OK, the bad news is that the Magnum XL with 4:10s is not quite as quick as the MT82/3:73s is. But it's close
The good news is the shifting is wonderful and I'm more "streetable " with the Magnum XL/4:10s.
In hind sight, the Magnum XL with 4:10s was a good move.
BTW, the 2.97 first gear with 4:10s is way more useful than the MT82 with 3:73s.
.Be aware that I had some complications along the way having the conversion done, but it all worked out.
In this thread, there is a whole host of things I learned. https://www.allfordmustangs.com/forum...magnum-xl.html
I also put on an MGW shifter. The standard Tremec Magnum XL is a long throw IMO.
2012 Shelby American Mustang GTS 580rwhp 485 ft/lbs Grabber Blue White Stripes
Ford Whipple, 5.0L, Tremec XL Magnum, MGW, Centerforce DYAD clutch, Boss 302 Torsen w/4:10s, 302R EPAS, Eibach Coil Overs, Fays 2 Watts Link, Dynotech DS, Shelby UCAs/LCAs, Wilwood brakes 6 piston 4 piston, Drake Bump Steer, heavy duty cooling, welded axle tubes, Interior Package, GT4 wheels, Borla Touring axlebacks, GT500 rear valence w/parking sensors, and airbag cover signed by Carroll Shelby.