Ford  Top Loader Three Speed Transmission

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Gear Shifter Housings

A common misconception about 1939 Ford three speed transmissions is that they all had the late style shifter housings. For the most part, Ford used the 81A-7222 housing for 1939 model production. The pickup trucks and the Standard Ford passenger cars initially received the 1938 type gearset (with the older synchronizer and gears), whereas the Deluxe Ford and the new Mercury cars got the newer version. Even if the 1939 transmission has the 81A-7222 shifter housing with the double detents, it may be fitted with the 1936-38 shifter fork (made for the smaller 1932-38 synchronizers). 

Since both shifter housings look very similar, people often mistake one for the other. In the pictures below, the left side of each housing is the front and the right side is the rear. Ford placed the housing part number across the front, and the numbers are generally not deeply recessed into the casting. So, with a bit of rust or grease or dirt, it is not very easy to read the number unless the crud is cleaned off.

The 81A-7222 housing uses the double detent plugs (one each on opposing sides) rather than the single plug used on all earlier housings. The plug on the 81A-7222 is also larger in diameter than the older style.



The 40-7222 shifter housing (known as the "slanted" tower) pictured below was used from 1933 through 1935 models. The B-7222 housing (1932 only) looked the same but had two mounting bosses on the right hand side for the parking brake handle mount. Both early housings incorporated the B-7235 shift lever guide plate (see picture at bottom of this page). The guide plate was discontinued after 1934 production. The early housings used the B-7230 and B-7231 forks through 1933 and perhaps part of 1934 production. The slanted towers used the smaller 7230/7231 shifter forks, but also used the smaller shifter levers. Although it will bolt on to any 1932-52 toploader gearbox case, it can NOT be used with the 1939 and later gear sets with the late style synchronizers. This housing is the single detent type, using the same detent spring and plungers as the 68-7222 housing.

The photo below shows the 91A-7230 second/high shifter fork used in the 81A-7222 housing. The part number was cast in slightly raised digits toward the top of the "yoke" part, on the forward face. The number is hard to see once the fork is assembled to the housing. As you can see in this picture, the tips of the fork are as wide as the rest of the fork and extend outside of the squared-off tip section.

The photo below shows the 91A-7230 fork width as measured by a common ruler. The space between the fork tips is just under 3" wide. The earlier transmissions used a smaller fork that measured about 2" across. The earlier fork extended down from the housing in a plane a bit forward of the 91A fork. This was to accommodate the early synchro sleeve, which had the shifter fork groove in the middle. The 91A fork shown here was offset to the rear slightly, which allows it to fit properly into the late style synchro with its fork groove at the back edge. Beware of "modifications" to an early style fork (ie: grinding down the inside edges of the fork to allow the 3" spacing. This would allow the fork to fit the late style synchro sleeve, but it would be positioned too far forward for proper shifting. 

 

The pictures below show a bare 81A shifter housing from the top and the bottom. You can see where the part number is placed on the housing's top front surface. The picture on the lower right shows the placement of the shifter shafts, the plunger, the balls and springs, and the detent plugs. The center plunger can only be accessed if the shifter shafts are removed, which is done through the access openings at the front of the housing. Also shown, below left, is the 68 series shifter housing, with the single spring detent arrangement. In this type, both detent plungers and the single spring all fit between the shifter rails when assembled. The smaller thumbnail pictures with the exploded parts views shows both shifter forks in the "neutral" position for both rails. This is the position you want when removing and installing the shifter tower assembly. The early shifter housings (B-7222 and 40-7222) included the B-7235 shift lever guide plate, which wrapped around the two shift rails. This was eliminated beginning with the 1935 housings and the change to the 40-7230 and 40-7231 shifter forks for 1935 production.

trans-shiftr-housing-81Atop.jpg (103733 bytes)            trans-shiftr-housing-81Abottom-B.jpg (89376 bytes)            trans-shiftr-housing-81Abottom-C.jpg (90699 bytes)
68shifter-parts.jpg (71611 bytes)               trans-shiftr-housing-81Abottom-D.jpg (120819 bytes)          

Click on thumbnail photos for enlarged pictures

Early (32-35) Shifter Fork Comparison

Ford 1939 Transmission Webpage

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