The Ford Tremec TR6060 6-Speed (2011–12 Mustang Shelby GT500) is a six-speed manual gearbox.
First gear is 2.97:1 and 6th is 0.50:1. Divide one by the other and the overall spread is 5.94:1. That is a very wide spread. With six gears to share it out, the steps in the middle can still stay civil.
6th is an overdrive at 0.50:1: the output shaft turns faster than the input shaft. Two of the six gears are overdrives. 4th is direct drive at 1.00:1.
The biggest step is 1st to 2nd, where the ratio drops 40%. The smallest is 3rd to 4th at 23%. On each upshift the revs drop by the same percentage as the ratio.
The final drive lives in a separate diff, so the speed table shows three common ratios: 3.42, 3.73 and 4.10. With a 3.73 final drive and 225/45R17 tyres, 6th at 6,000 rpm works out at 385 km/h (239 mph), and first runs out at 65 km/h (40 mph). That is how tall the gear is, not a top speed. Drag and power decide that. At 70 mph in 6th the engine turns about 1,760 rpm.
Nearly the same box as the GM Tremec T56 Magnum 6-Speed Wide Ratio, 0.74/0.50 OD (Aftermarket LS): 2nd is 1.78 here and 2.10 there; 3rd is 1.30 here and 1.46 there. That page is the one listed for search; this one stays for anyone after this exact version.
Ratios
| Gear | Ratio | Step |
|---|---|---|
| 1st | 2.97:1 | - |
| 2nd | 1.78:1 | 40.1% |
| 3rd | 1.30:1 | 27.0% |
| 4th | 1.00:1 | 23.1% |
| 5th | 0.74:1 | 26.0% |
| 6th | 0.50:1 | 32.4% |