advance adapters inc. p/n: ford aod ford aod automatic transmission
Contents
1. potential for driveline snapping shifts unknown to most other Ford transmissions are left hidden by this soft calibration Fortunately a few simple valve body revisions in addition to these previously mentioned can prevent those power wasting slush shifts In addition these revisions can be done in varying de grees to suit the individual The final but perhaps most important valve body revision for a performance AOD is rasing the shift points A high performance engine cannot develop its full potential if the transmission shifts in the middle of the engine s power band With shift points around 4500 continued on page 26 RE Eer e continued from page 24 around 4500 rpm with the high speed gov ernor the AOD does just that Since the AOD uses a throttle valve TV cable with a regulated pressure limit instead of the more familiar vacuum modulator we cannot adjust full throttle shift points externally Instead the TV limit valve must be modified to pro vide an increased maximum TV anti shift pressure to the shift valves The advantage of this system is that light to moderate throttle shift points are not disturbed thus maintain ing the driveability and fuel efficiency of a stock transmission The Motorsport rear lube kit is a neces When changing clutch pack components i clutch drums or clutch packs clearance is criti sity for pre 1988 units used in performance cal A simple feeler gauge can be used2. tocheck applications This kit which requires com clearance as shown If clearance is not within plete transmission disassembly for installa shop manual specifications use another selec tive snap ring tion re routes rear lube fluid feeding the planetary gears providing more positive lu C e BREE T aa a brication flow Unlike conventional transmis C sions the lube supply to the planetary gears is critical especially with low axle ratios and high speeds because the planetary gears Te are always working in overdrive Without hae adequate lubrication the planetary assembly Top could fail resulting in a very expensive repair Pii gee NT N bill It is best to think of the rear lube kit as eoin eR fe Te E cheap insurance for your AOD k a Meee a Sea Upon completing modifications it was time for a test flight After a gentle break in a run we were ready to test the AOD s full Tt paca potential The shifts were extremely positive Ae id PET AR chirping second and third However at 4900 rom the shift points were still a little lower than our goal of 5500 rom Another fine point was the 1 2 shift which was actually too TE es ee Ree hard that s a switch for our application a a a ee ee ie ee ee ER 5 0L HO Ranger with a weak 7 5 inch rear Shown are the selective snap rings foreground used to set clutch pack clearance and selective thrust axle We made a quick tip back into me uae washers background used for setting
3. ADVANCE ADAPTERS INC P N FORD AOD P O Box 247 4320 Aerotech Center Way New Item 8 94 Paso Robles CA 93447 PAGE 1 OF 5 Telephone 800 350 2223 Fax 805 238 4201 Page Rev Date 08 08 94 FORD AOD AUTOMATIC TRANSMISSION INFORMATION USING THE NEW STYLE SHAFT 1988 89 If you elect to update your AOD output shaft to the newer design that has the additional hole you must change the valve and spring assembly We have listed the three different valve and spring assembly part numbers that correspond to the various governor assembly sizes The information listed below is a direct reprint from the Ford notice concerning AOD Governor Interchangeability A O D INTERCHANGEABILITY When using this output shaft to service 1983 87 transmission models rework the governor assembly using the supplied valve and spring assembly kits Identify the governor being reworked and select the proper governor valve and spring kit from the information below VALVE amp SPRING DIAGRAM ASSY KITS See below SPRING COLOR CODE VALVE I D E7SP 7G495 DA A YELLOW 250 DIA E7SP 7G495 CA A NONE 250 DIA E7SP 7G495 AA B NONE 175 DIA STEP For disassembly and assembly of governor see Volume D Section 17 20 of the appropri ate Car Shop Manual or Volume A Section 17 20 of the appropriate Truck Shop Manual To service 1982 and prior models use new Governor Assy 7C063 DIAGRAM A DIAGRAM B 1 to te ai STEP SPECIAL NOTE The compone
4. ce when changing clutch pack components Selective snap rings available from Ford can be used to dial in the correct clearance Another weakness of the AOD is the forward clutch mainly due to difficulties in downshifting out of overdrive Shifting into overdrive requires the overdrive band to en gage as the forward clutch disengages Asa result a shift out of overdrive especially under hard throttle is difficult for the forward clutch because it has to engage under full power with low line pressure This causes undue forward clutch wear and sluggish down shifts out of overdrive Eliminating the line pressure cut back as mentioned to im prove the direct clutch system and installing the five plate police clutch drum solves these problems In addition enlarging the forward clutch apply orifice in the valve body makes the forward clutch engage even faster thus keeping destructive slippage to a mini mum However itis still advisable to keep the shifter in D during bonsai runs to lock out overdrive After correcting weak links the impor tant aspect of building a performance trans mission is improving shift feel Stock trans missions are calibrated to shift slowly result ing in smooth shifts which give the transmis sion a seamless luxo car feel While this may be nice for the average Town Car owner it is unfortunately a detriment to perfor mance enthusiasts Mechanical features unique to the AOD giving it a
5. e a vacuum modulator to sense engine load thus determining shift points and shift quality it must have a direct link to the throttle allowing it to determine engine load from throttle position rather than manifold vacuum For vehicles without multi port fuel injection a rod similar to the kick down rod used with most other Ford automatics is used A common problem that arises when upgrading to a perfor mance carburetor on a factory AOD equipped vehicle is that the TV rod must operate through the entire through a small portion of its full range Do not let the similarity with the kick down rod fool you it is impossible for the AOD to operate without the TV rod tracking the entire throttle range Failure to do so will cause either excessive shift points a failure to downshift out of overdrive during deceleration causing en gine stall transmission failure or ere In order to remove and install clutch pistons and return springs a tool is needed to compress the spring allowing the retainer to be released safely This compressor tool was easily fabricated from 7 16 inch threaded rod washers and a flat steel plate Be sure to change all clutch piston seals while your transmission is apart because they fail with age SUPER FORD May 1990 other serious problems There are a few methods that can be used to adapt the AOD s TV linkage to a non stock engine The first method is to connect the TV rod to the carburetor kick down l
6. geartrain end play The selective snap rings are available in ody and solved these problems ending up many thicknesses Consult your Ford dealer for a full listing with an incredible performance transmis sion and almost no compromises The rear lube kit is just the beginning of Motorsport s line of AOD upgrades Many items are in the works and soon to be released A performance valve body high stall speed torque converter and a deep sump chrome oil pan are in the works for the AOD When these goods become available AOD performance will be better than ever So stay tuned to WAOD for more information If you plan on embarking on your own AOD adventure be sure that you study the proper section in your Ford shop manual very carefully Make sure you know what you are planning to do before you do it and of course if the job looks too involved enlist the help of an expert Further information on the valve body modifications are available by mail and if demand warrants a complete kit may be available SF The motivations for our troubles a suitably tweaked AOD behind the 5 0L HO swapped into this Ranger pickup will make for one nice little package 26 SUPERFORD May 1990
7. inkage while modi fying the carburetor linkage to permit travel of the kick down arm directly with the throttle i e bolt them together It is critical that you ensure the ratio is correct resulting in the right amount of travel of the TV lever at the transmission for the entire throttle range The best way to check this is to compare your new carburetor side by side with a stock AOD carb or throttle body Ifthe distance from the center of the throttle shaft to the TV rod connection point is equal then the carb will probably work It is also important that the TC leer on the car points in about the same direction as the stock unit for example if at idle the linkage on the stock carb is pointing to 11 o clock the new carb s linkage should also point to 11 o clock If the arm on your carburetor will not work or if it does not have one you can probably fabricate and attach one keeping the above parameters in mind Always be sure to include some way to adjust your linkage Ifa TV rod proves to be difficult or impos sible to adapt you may be able to adapt a TV cable from a multi port EFI application You will want to look at several different vehicles in an effort to find a cable length and configuration that best suits your application Then order the cable with the correct brackets and transmission lever from your Ford dealer If the ratio os correct you may be able to operate the TV cable directly from the accelerator pedal Othe
8. nd must be free of debris Of course removal of all debris created by drilling is critical And while your AOD is apart be sure to check this bore in the rear of the case for wear The governor and direct clutch oil feed rings run in here and the teflon oil ring used in some transmissions may wear deep grooves in the aluminum If your case is worn you will either have to replace it or have a trans mission shop install a repair sleeve Fortu nately new cases from Ford re not as expen sive as you might think Be sure to use the cast iron oil rings when reassembling your trans mission gt A comparison of forward clutch drums shows the higher groove in the 351 police drum at right shown by the rulers which raises the retaining ring allowing five clutch friction plates to be fitted rather than the usual four Shown here is the stock governor compared to the Mustang GT assembly Looking closely you will notice the valve and spring on the GT unit top right are slightly different than the stock unit allowing slightly higher shift points The GT governor is included in the Motorsport rear lube kit Shown here is the Transco direct clutch pack kit right compared to the standard replace ment clutch plates This kit allowed us to use seven clutch friction plates in our five plate direct clutch cylinder d Note the absence of Installing the clutch pistons can be tricky busi ness indeed due
9. nts packaged in this kit have been assembled and machined for specific type of conversions Modifications to any of the components will void any possible warranty or return privileges If you do not fully understand modifications or changes that will be required to complete your conversion we strongly recommend that you contact our sales department for more information This instruction sheet is only to be used for the assembly of Advance Adapter components We recommend that a service manual pertaining to your vehicle be obtained for specific torque values wiring diagrams and other related equipment These manuals are normally available at automotive dealerships and parts stores This is something that no one likes to see fried friction Our modifications will help pre vent this injustice to AOD owners To most people this may look like a bionic pizza but it is actually a high quality rebuild kit from Trans Parts in Sarasota Florida that supply them for Ford at a much lower price This kit contains components from the same manufacturers A rebuild kit such as this should be the foundation for any transmission build up allowing you to start with a fresh transmission A 1 4 inch drill is being used to counter bore the governor oil feed passage allowing the installation of a filter screen supplied with the rear lube kit The filter is needed because oil from the governor feed circuit is now used for rear lubrication a
10. r op tions include the use of brackets in front of the throttle linkage or under the throttle linkage The cable allows freedom to make special brackets and the like for use in tight quarters If you are using a multi port EFI engine even if originally equipped with a manual transmission the stock cable for the application will bolt right on It is good practice to soak all of your new clutch friction plates in fresh ATF prior to installation A half full ATF bottle with a slot cut in the side as shown makes a handy tool for soaking your clutch plates The fabricated compression tool mentioned in the caption at left is shown in the upper right corner of this photo A OK AOD because line pressure the main fluid pres sure used to apply all clutches and bands is reduced or cut back in third and fourth gear when the direct clutch is applied This dura bility problem can be solved by increasing the quality and quantity of direct clutch plates while altering the valve body to eliminate the line pressure cut back in third and forth gears The heavy duty direct clutch pack kit from Transco allows up to seven friction plates to be fitted to the stock five plate direct clutch drum If extra durability is needed Ford makes a six plate heavy duty direct drum used in some 1988 and newer models Ford part E8LY 7F283 A which will accommo date up to eight friction plates It is especially important to check clutch pack clearan
11. to the inward facing lip seals similar to drum brake wheel cylinder cups The aid of special seal installer tools is a must but if you are lacking such resources and have tons of patience you can improvise Use stripes of thin plastic wrapped around the in side and outside seals to guide them into posi tion See through plastic report covers are excellent for this purpose SUPER FORD May 1990 23 24 Adapting the AOD to non stock applications The AOD will generally bolt into most ve hicles but a few problems may arise For start ers your stock block plate and flexplate will probably work fine just be sure that you use the correct flexplate for your engine small block Fords are balanced ina variety of ways Though the transmission crossmember must be moved rearward to fit the rear mount of the AOD the stock transmission mount will usually work Moving the crossmember is as simple as chang ing to a rear set of holes in some vehicles but may be very involved for other applications such as unibody cars The good news is that the drive shaft will seldom need shortening The short extension housing AOD has the same overall length as most regular Ford automatic and manual transmissions and can even directly replace some of the Japanese built units used in four cylinder applications Probably the most confusing aspect of adapting an AOD is making the throttle valve TV linkage operate correctly Since the AOD does not us
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