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Discussion Starter #1
So my MT-82 died and I'm looking at ordering a new Tremec T56 Magnum XL for my car. The only question I have is what gears ratio I should get. I have 3.73 in the back and I need to know if I should get a 2.66 first or 2.97 first. It's a daily driver that I do have some fun with occasionally. I want it to still be really fast on the top end, but get out of the hole fast as well.
 

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I'd get the 2.97. Otherwise the gear spacing with the 2.66 is way too far apart.

You'll miss the MT-82 ratios. Even with the 3.73's.
 

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Discussion Starter #3
I thought the 2.66 is the close ratio? The only concern I have with the 2.97 is that the 1st gear is nearly non-existent.
 

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No. The 2.66 has much wider spacing. Although they both have a 1:1 4th gear.

Check out the ratios here TREMEC MAGNUM XL T56 6-speed Solution to poor shifting in S197 Mustangs - Modern Driveline

Notice the ratios? If you go with the 2.66 first, it'll be like the MT-82's 2nd gear, and the T-56's 2nd gear will be like the MT-82's 3rd gear.

Not good IMO, unless you're making some crazy horsepower (FI), you'll probably be slower than before. Not good.

The 2.97 looks just right with the 3.73's.

Your MT-82 is a 3.66 first gear. You'll be dropping down a whopping 20% to a 2.97.
 

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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.
http://www.allfordmustangs.com/forums/2011-2014-mustang-talk/533713-who-has-swapped-out-their-mt82-t-56-magnum-xl.html

I also put on an MGW shifter. The standard Tremec Magnum XL is a long throw IMO.
 

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Discussion Starter #7
Awesome. I'll go with the 2.97 right now. I live right near MGW, so they are making me one and I'll pick it up Friday. :) I have an MGW in my MT-82 and I love it. I'll probably end up putting 4.10s in my car. Does it kill gas mileage and top speed though?
 

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My fuel mileage is the same, maybe a tenth or two better.

Top speed? I have not done anywhere close to top speed capabilities.

As far as my saying the Tremec's 1st gear 2.97 with the 4:10s is more useful than the MT82/3:73s, the first time you are tooling around a parking lot, you'll see what I mean. There used to be times I was going slow in a parking lot and I had to figure if I wanted to stay in first at high RPMs, or go to second.
I don't have that problem anymore, I stay in first and the engine isn't screaming.

Yeah, that first parking lot you go to will tell the tale of a once again useful first gear.

Another member Kona stang10 did the conversion. Check out his signature below, see the 4:10s and the supercharger? He's doing 72 ft lbs more torque than I am.

"2012 GT Premium, Tremec 6speed manual,Ford racing 4:10's,Paxton novi 2200sl, Spec3+clutch, Whitleline lca,steeda adj. uca,Whiteline relo brackets, Sway bars, watts link, Steeda sport springs, Steeda hd strut mounts, Takico D-spec struts and shocks, Tremec Shifter, GT-500 Axle backs, kooks super street headers, S/W 3" off road x, Dyno tech d/s, JLT big Air Intake, Rev auto 93 dyno tune, Boss 19" 302 s wheels with m/t dr's staggered..641-rwhp, 557 ft lbs of torque."
 

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Here is some math for you from that old thread.
It shows rear end gears and the MPH at redline.
I mean, theoretically, you could do 4:30s, and it would closely match the MT82/3:73s for gears 1-3.

If you look closely, the reality is that you will see the Tremec XL (2.97 type) with 4:10s is really closest to an MT82 with 3:55s.
That's why I say I am more streetable and shift less than I used to.


MT82 3:55s
43 65 94 120 158 243

MT82 3:73s
41 62 89 114 151 232

Tremec close ratio (2.97...) 4:10s
46 65 94 137 171 217

Tremec (2.97...) 4:30s
44 62 89 131 163 207
 
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