TREMEC MAGNUM XLThe 5th Gen Mustang turned heads with retro styling and wooed scores of people hungry for a new sports car with the Camaro disappearing from the market only a couple of years before. After four successful years, Ford made a revision to the Mustang in 2010 and the following year, the Mustang switched from the TR-6060 6-Speed and T5 or TR-3650 5-Speeds to the Getrag MT82 6-Speed. 

Complaints about the shift quality, gearing, and grinding gears began to surface. People took to forums, posted videos on the internet and filed complaints with the government. The Getrag MT82 eventually was quietly improved and subsequent years didn't have as many problems as the initial 2011 model year, but many people still struggle with the low gearing and the remote shifter location.

When a transmission is designed, there are several areas of concern to keep in mind. To start with, the first gear should make it easy to launch the car. Usually this drive ratio (the ratio that takes the transmission’s first gear and the rear axle ratio into account to find the actual amount of times the engine must turn to spin the tires once) should be between 9 and 11. Too high and the tires will lose traction, too low and the engine won’t have enough power to launch the car, so 10 is about perfect for a rear wheel drive sports car like the Mustang.

From the first gear ratio, you want a fairly consistent change in step through the rest of the gears without dropping the RPMs too low. 2nd gear should be able to accelerate from 0-60 mph without redlining. 3rd and 4th gears should be pleasant and drivable. 5th gear is for reaching maximum speed while 6th gear is for fuel economy.

Because the rear axle ratio can effect the RPM drop, ideal transmission ratios will vary and what may be perfect for one car won’t be for another. The TREMEC Magnum XL comes with two different gear ratios sets to choose from.

This chart compares the two different Magnum XL gear sets with the factory Getrag MT82. The Mustang came in different performance packages that had different rear axle ratio options. The chart also compares the different rear axle ratios with the three transmissions.

 

Magnum XL
2.97 First Gear
 Rear Axle Ratio 3.31 Rear Axle Ratio 3.55 Rear Axle Ratio 3.73  
Gear Ratio   Drive Ratio Engine RPM RPM Drop   Drive Ratio Engine RPM RPM Drop   Drive Ratio Engine RPM RPM Drop    
1st 2.97   9.86 3552     10.58 3810     11.12 4003     28" Tire @ 30 MPH
2nd 2.10   6.95 2503 1049   7.46 2685 1125   7.83 2821 1182    
3rd 1.46   4.83 2901     5.18 3111     5.45 3269     28" Tire @ 50 MPH
4th 1.00   3.31 1987 914   3.55 2131 788   3.73 2239 1030    
5th .80   2.45 2058     2.63 2208     2.76 2319     28" Tire @ 70 MPH
6th .63   1.66 1391 668   1.78 1492 716   1.87 1567 752    
Magnum XL
2.66 1st Gear
 Rear Axle Ratio 3.31 Rear Axle Ratio 3.55 Rear Axle Ratio 3.73  
Gear Ratio   Drive Ratio Engine RPM RPM Drop   Drive Ratio Engine RPM RPM Drop   Drive Ratio Engine RPM RPM Drop    
1st 2.66   8.80 3171     9.44 3401     9.92 3573     28" Tire @ 30 MPH
2nd 1.78   5.89 2122 1049   6.32 2276 1125   6.64 2391 1182    
3rd 1.30   4.30 2583     4.62 2770     4.85 2911     28" Tire @ 50 MPH
4th 1.00   3.31 1987 596   3.55 2131 639   3.73 2239 672    
5th .80   2.45 2058     2.63 2208     2.76 2319     28" Tire @ 70 MPH
6th .63   1.66 1391 668   1.78 1492 716   1.87 1567 752    
Getrag MT82 Rear Axle Ratio 3.31 Rear Axle Ratio 3.55 Rear Axle Ratio 3.73  
Gear Ratio   Drive Ratio Engine RPM RPM Drop   Drive Ratio Engine RPM RPM Drop   Drive Ratio Engine RPM RPM Drop    
1st 3.66   12.11 4363     12.99 4679     13.65 4917     28" Tire @ 30 MPH
2nd 2.43   8.04 2897 1466   8.63 3107 1573   9.06 3264 1652    
3rd 1.69   5.59 3358     6.00 3601     6.30 3784     28" Tire @ 50 MPH
4th 1.32   4.37 2623 735   4.69 2813 788   4.92 2955 828    
5th 1.00   3.31 2781     3.55 2983     3.73 3134     28" Tire @ 70 MPH
6th .65   2.15 1808 974   2.31 1939 1044   2.42 2037 1097    

 

As you can see, both TREMEC Magnum XLs’ RPM drop between 1st and 2nd gears is substantially less than the Getrag MT82 RPM drop. You’re not going to have to short shift to 2nd gear in the middle of an intersection or continually shift up and down while driving through town like some people complain is required with the Getrag MT82. The choice of gear ratios for the Magnum XL offers greater flexibility.  If you look at the RPM drop and 1st gear launch Drive Ratios, it’s clear that the wide ratio XL is ideal for the base model 3.31 Axle while the close ratio XL is ideal for the 3.73 high performance axle option. Either Magnum XL transmission would work well with the optional 3.55 axle. However, the Getrag MT82’s high 1st gear launch Drive Ratio value (above 12) combined with the larger RPM drop between gears which continues to increase with no gearing choices to compensate for the loss of power means the most expensive, high performance package offered with the MT82 has the worst gearing.

Beyond the gear ratio issues, the 2nd biggest complaint is the feel of the Getrag MT82. The MT82 has a remote shifter. There’s nothing mechanically wrong with a remote shifter, but the Magnum XL’s use of a direct mount shifter makes it FEEL more solid and precise. The Getrag has a more disconnected feel and really doesn’t give positive feedback to the driver.

Yet another factor is the 2-piece driveshaft. In the Magnum XL kit, you’ll receive a 1- piece aluminum driveshaft designed to work with the TREMEC Magnum XL in cooperation with TREMEC by the folks at Dynotech. You’ll also get a crossmember, bellhousing and any other parts you’ll need to make the conversion in a complete kit from SST.

If you’re tired of the disappointing acceleration, poor quality shift feel, and other issues plaguing the Getrag, give us a call, we’d be glad to help you get everything you need to install a TREMEC Magnum XL into your Mustang.

PLUS! Take advantage of Silver Sport Transmissions's Market Leading Warranty. Learn More