So it's good for 220hp?
As 249HP mentioned, the MTX-IV in the SHO
and Tempo are almost completely different beasts. Why Ford gave them the same name is beyond me. Almost none of the parts interchange and even the internal machining on the cases is different. The gear ratios are also different, as is the final drive. 5th gear (OD
) is the biggest difference between the designs though. The SHO
MTX-V uses a different final drive ratio for 5th gear. The .74 5th gear is actually the 1.02 4th gear with a 2.73 final drive instead of a 3.74. When you shift into 5th, you're not shifting out of fourth but merely switching to a taller final drive. This makes 5th gear dramatically stronger in the SHO
transmission. 5th gear is the weakest link in the Tempo MTX-IV.
That said, the gear ratios on the Tempo MTX-IV are slightly better suited to the low revving nature of the Vulcan. It will also turn a lower RPM
in 5th gear which in this case means better fuel economy. The first four gears aren't that much weaker than the SHO
MTX-4 either. It should hold up fine behind a Vulcan in a Taurus. As for if it will handle 220HP, that depends. Torque capacity is what we care about here. HP means nothing to a transmission as it isn't a measurement of power. HP is a measurement of work, meaning how much power you can produce over a given period of time. Given the weight of an '03 wagon, I wouldn't reccomend going beyond 200-210 lb. ft. of torque. For reference, the stock '03 Vulcan puts out 186 lb. ft. Even if you start modding the engine though, you're not going to get over 200 lb. ft. without boost, nitrous or increasing displacement. You'll be fine with the Tempo MTX-IV as long as you don't try to pull a heavy load in 5th gear or launch hard from a dead stop. Basically, no clutch drops. The SHO
MTX-IV isn't much better with the latter anyway. The final drive is a weak point in both.