It is often possible for smaller manufacturers to save money by buying a component used and developed by a larger company. The general theme is that bigger manufacturers can negotiate better pricing because of the sheer quantity of the parts that they buy. But, in this case, it seems the biggest manufacturer charged the most for the part.
The Ford GT uses the 7DCL750 dual clutch gearbox from Getrag. This is a transaxle type gearbox designed for high torque applications. It can take an input speed of 9,500 RPM and can handle up to 553 pound-feet of torque, so it's not surprising to find it in a variety of exciting machinery such as the Ferrari California and 458 as well as the AMG GT and SLS.
All applications of this transmission have a similar housing and the parts inside are often shared; four of the five variants share the same gear ratios for second through fifth gear (the Ferrari California has a unique fifth) and all but the Ferrari 458 use the 3.40 first gear ratio. The ratios for sixth, seventh, and the final drive don’t follow a specific pattern and are spread out all over the place. The Ford GT, AMG GT, and the SLS also share a final drive ratio. The SLS shares seventh gear with the Ferrari California. Confused yet? Maybe this chart will help:
The gear ratios are just different enough that most of the transmissions aren't interchangeable, but the gearboxes in the Ford GT and AMG GT share every single ratio, including the final drive. That might make you think that there'd be a similar replacement cost for these two units. It turns out that the Ford GT version is not only double the cost of the Mercedes unit, it's about $5,000 more than the gearbox Ferrari uses. The Ford variant is also on an exchange-only basis. That means if you don’t have one to turn in there is an additional $5,000 charge, making the spread in replacement cost even bigger.
The Ford variant–part number HG7Z-7000-A–has , which doesn't include that $5,000 charge. The total price is $32,324, or the same as a nicely optioned Mustang EcoBoost. Online parts discounters show a 14.5 percent discount, which could bring the price down to $28,318. However, sources at Ford tell me that it is unlikely that such a purchase could be completed unless you already own one of the cars and go through a Ford GT concierge.
On the other hand, the Ferrari 458 variant–part number 263938–is available from online sellers such as Scuderia Car Parts and , a $6,000 discount compared to the replacement part for the Ford GT. Ferrari is also known to be pretty strict on parts ordering, so that purchase could require some extra steps. The cheapest variant of the gearbox, by far, is the AMG GT version, Mercedes part number A1902600500. It , but is available from online discounters for $13,446. Mercedes also offers a rebuilt variant of the transmission under part number which comes out to $11,715 after a $2,130 core charge is added.
The other variants of the Ferrari and Mercedes gearboxes are within a few hundred dollars of their counterparts, but none approach the replacement cost of the Ford GT's. Ford buys a lot of transmissions from Getrag, so they should have favorable pricing. But it only built 138 Ford GTs in 2017 and will likely only build 1,500 GTs over the whole model run, so the small quantities could be a factor. In comparison, Ferrari built thousands of 458s and Mercedes-Benz sold more than 4,000 AMG GTs just in 2017.
However, the GT is an incredibly exotic car and this is the only application Ford has for such a gearbox. We've reached out to see if Ford made some sort of customization that requires unique parts and its own production run, which would then increase the cost, and will update this post when we hear more.