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#Built aod transmission for sale install#
When installing an AOD into a carburetted vehicle, you’ll need to install an additional lever onto the carburettor to operate the TV cable. If not correctly adjusted, you’ll burn the ’box out simply driving it around the block. The trickiest part of the conversion is correctly adjusting the TV cable, as the AOD has an incredibly finicky TV. Before installation this particular ’box received a shift kit to speed up and stiffen the action. The AOD’s non-synchronous first-to-second and second-to-third shifts can yield superior shift quality over a C4, C6 or FMX but unfortunately the AOD’s soft valvebody calibration hides its performance potential - it almost feels like it’s slipping between changes. Also there is a rare, long-extension housing version - you’re after the one that measures around 260mm (10¼in). Steer clear of the later AOD-E and 4R70-W as these are computer-controlled versions. If you’re shopping on the internet for an AOD, your best choice is one from an ’86 to ’93 5.0-litre Mustang. This dual-shaft arrangement makes it easy to incorrectly install the converter, with catastrophic results (see Steps 03 and 06).
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Bury the throttle hard enough in top and the ’box drops out of overdrive, bringing the converter back into play. Instead, it has a shaft within a shaft (see Step 03) that bypasses the converter to directly drive the gearbox when in overdrive and partially (60 per cent) in third. Unlike its GM counterparts, the AOD doesn’t use a lock-up converter. There are 1200hp versions but these are radically different in operation. With the range of aftermarket gear (from TransGo, B&M, TCI, LenTech Automatics and Baumann Engineering), they can be built to handle in excess of 800hp. Internally, the AOD shares similar planetary architecture as the old FMX, so it’s strong by design - note the considerable difference between AOD and C4 internals (above right) a stocker can handle more than 400hp. That’s where the similarities end the AOD is wider (356mm v 250mm), heavier (63kg v 45kg) and a lot broader in the main body. At 780mm, the two ’boxes are equal in length. And except for the AOD’s overdrive fourth, the ratios between the C4 and AOD are very similar (C4: 2.46, 1.46, 1.00 AOD: 2.40, 1.47, 1.00, 0.67). THE GEARBOXīellhousing-wise the AOD is the same as every other Ford gearbox it also uses the same 28-spline output shaft common to the C4 and BW35. For those who don’t know, ’67 Rancheros are virtually identical under the body to XR-XC Falcons, so nearly all the salient details are the same for anybody looking to put an AOD into a pre-’88 Aussie Ford. Kris Hodges, of Kris Hodges Automotive (02 4297 6620), decided to savour the benefits of overdrive by slotting an AOD into his 1967 Ranchero ute. There are numerous advantages to stepping up to a four-speed auto lower cruising revs, less engine wear, quieter cruising, increased fuel economy and potentially better off-the-line acceleration when combined with taller diff gears. However, the proliferation of these gearboxes in Mustang drag racing, along with the rise in popularity of retro-fit installations, means there is now almost as much aftermarket gear and accumulated experience for the AOD as for the venerable C4. This has much to do with the AOD receiving bad press for being hideously complicated, having a troublesome valvebody and not being very strong - the lock-up input shaft and overdrive band are notorious weaknesses. While dropping AODs into older Fords is quite common and well-documented in the US, it’s a relatively unusual swap here. But don’t despair - there is a solution for the FoMoCo brigade, in the shape of the hydraulically operated AOD (Auto Over Drive) four-speed. Unlike Holden, which offered the hydraulically shifted TH700 when shifting from three to four speeds, Ford Australia jumped straight from three-speed hydraulic autos to electronically controlled four-speed overdrive units, which are a complete bugger to retrofit to older Fords. One area where you can close the gap is by upgrading your streeter’s antiquated three-speed auto for a slick-shifting four-speed overdrive unit. But while they’ve certainly got style, they lack the dynamics and finesse of modern machinery. THERE’S something innately satisfying about cruising in an old-school streeter. Want a four-speed auto for your older Ford? Fitting an AOD (Auto Over Drive) is an ideal solution